Plant cells, unlike animal cells, are characterized by the presence of a cell wall.
Cell walls are a protective layer that is rigid and only partially permeable on some types of cells. This outer layer is located near the cell membrane in the majority of plant cells as well as those of fungi, bacteria, algae, and some archaea (plasma membrane).
Animal cells, however, do not have a cell wall. The cell wall of a cell performs a number of essential functions, including support, construction, and defence.
Depending on the organism, the cell wall's makeup varies. The vast majority of a plant's cell wall is made up of sturdy cellulose fibres. Cellulose, a substance used in the production of paper, is found in large quantities in both wood and cotton fibre. The walls of bacterial cells are composed of a polymer of sugar and amino acids called peptididoglycan.
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The barrier between the intracellular and extracellular fluid compartments in an animal or plant is the:________
The barrier between the intracellular and extracellular fluid compartments in an animal or plant is the plasma membrane.
The plasma membrane or cell membrane is a double membraned cell organelle that surrounds and protects the cell and other cell organelles. Both prokaryotic and eukaryotic cells have a cell membrane.
The plasma membrane is about 5 - 8 nm in thickness and is composed of proteins, lipids and carbohydrates that come together to form a flexible bilayer. This lipid bilayer gives the cell membrane its ability to separate intracellular and extracellular fluids.
The plasma membrane also plays a role in signalling and communication between cells and anchors the cytoskeleton to provide cell shape and maintain cell potential.
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Biologists suspect that endosymbiosis gave rise to mitochondria before chloroplasts because?
Biologists suspect that endosymbiosis gave rise to mitochondria before chloroplasts because several eukaryotes lack plastids, but all eukaryotes contain mitochondria.
Endosymbiosis- Endosymbiosis is a symbiotic connection in which one organism lives inside the other. The term "primary endosymbiosis" describes the first time an ancient eukaryotic cell internalized prokaryotes, giving rise to the mitochondria and chloroplasts.
Eukaryotes- Every creature or cell with an identifiable nucleus. The nucleus of a eukaryotic cell, which houses the well-defined chromosomes (bodies holding the genetic material), is surrounded by a nuclear membrane.
Prokaryotes- Prokaryotes are creatures without a nucleus or other organelles in their cells. Bacteria and archaea, two separate groupings of prokaryotes with allegedly independent evolutionary histories, are separated into.
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An advantageous mutation is more likely to get fixed in a population through genetic drift than is a deleterious mutation. True or false?.
It is false that an advantageous mutation is more likely to get fixed in a population through genetic drift than is a deleterious mutation.
Genetic drift is described as the random change in the frequency of a mutation in a population from generation to generation induced by the population's finite size. Most beneficial mutations are lost owing to genetic drift; however, some somewhat damaging mutations may become permanent.
It takes a long time to detect a significant influence of genetic drift on allele frequencies in large, unthreatened populations; genetic diversity indicates a balance between mutation and natural selection. When natural selection is much less than one, drift can counter selection, and alleles behave as if they are neutral. As a result of this process, small populations may exhibit more maladaptation (i.e., a mismatch between environment and mean phenotype) than larger populations. Mildly harmful mutations, on the other hand, will likely accumulate in small populations since selection is unsuccessful at eliminating them. This can result in a'mutational meltdown,' in which harmful mutations drive down population growth rate (and size), rendering the population more susceptible to subsequent mutation fixation.
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What controls this ability to connect through the body movements and facial expressions of others?
Our volitional centre, the motor cortex, is where we impose specific facial expressions in order to convey the desired message or because the situation requires it.
What is the purpose of the motor cortex?The motor cortex's main job is to provide signals that control how the body moves. It is anterior to the central sulcus and a portion of the frontal lobe. The primary motor cortex, premotor cortex, and supplementary motor area make up this region.What kinds of motions does the motor cortex regulate?The motor cortex generates signals that are particular to movements and sends them to the muscles via spinal cord circuits and motor neurons to regulate motor behaviour. For the execution of movements to be precise, coordinated muscle activation patterns are required.learn more about motor cortex here
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Each peroid of the periodic table begins on the left with a:
very active metal
metalloid
rare-earth metal
Answer:
Rare Earth medals
Explanation:
Hurry please two minutes!!
recall that in science, a theory is a well-tested explanation that unifies a broad range of observations and hypotheses and enables scientists to make accurate predictions about new situations. how does the cell theory demonstrate this definition of this theory?
The cell theory demonstrates the scientific definition of a theory in three ways. First, it's been tested extensively. Second, it summarizes the research and observations of the many different scientists who worked at different times. Third, it allows researchers who observe evidence of cellular structure in unknown objects to form predictions about the object such as whether it is a living thing and it can reproduce itself.
What is a cell theory?
Cell theory states that the cell is the basic functional and structural unit of all living organisms. Now, modern cell theory adds that all living organisms are made up of cells and cells arise from pre-existing cells.
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Sour dough bread is made sour by a decrease in ph caused by the acids produced by lactic acid bacteria.
a. true
b. false
Answer:
Sour dough bread is made sour by a decrease in ph caused by the acids produced by lactic acid bacteria is true.
Explanation:
A combination of flour with water is used to make sourdough, which is then fermented with yeast plus lactic acid microorganisms, especially bacteria. Then the starter's acids are what gives the bread its sour flavor. The starter has the ideal conditions to ferment and develop that particular sour flavor because of the components and a warm atmosphere. Find a cold environment for something like the dough to form if you want to produce a much more sour loaf.
Depending on the state of fermenting that it is in, the sourdough's pH varies, although in average it ranges from 3.5 to 5. Because harmful microbes cannot grow in a system with a pH lower than 4.6, this happens because the acidity keeps them away.
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The vital ability of an organism to take certain actions when changes occur in its immediate environment is called ________.
The vital ability of an organism to take certain actions when changes occur in its immediate environment is called Adaptation
What is Adaptation ?In biology, there are three related definitions of adaptation. First, natural selection, a dynamic evolutionary process, adapts organisms to their environments, improving their evolutionary fitness. Second, it is a state that the populace attained as a result of that process.
The streamlined bodies of aquatic fish and mammals, the light bones of flying birds and mammals, the long, dagger-like canine teeth of carnivores, and the long necks of giraffes for feeding in the tops of trees are a few examples. According to all biologists, organismal characteristics frequently represent adaptations.Learn more about Adaptation here:
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You want to count only the viable cells in a sample. What is the best technique to do this?.
The best technique to count only the viable cells in a sample is the plate count method.
Viable cells are living and healthy cells among a population of cells under certain conditions. These are the metabolically active cells. The cells are important to know about various properties of the species of growing cells. This property is also widely used in drug testing.
Plate count method is the widely used laboratory technique to determine the count of viable cells. It is a multi-step process that requires strict aseptic and non-contaminated environment to obtain the accurate results. The result obtained is several colonies of cells that can be seen through unaided eyes.
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___can be separated by physical methods can only be separated by chemical methods and __ cannot be broken down further.
Mixtures can be separated by physical methods can only be separated by chemical methods and elements cannot be broken down further.
Physical methods can be used to separate mixtures, especially mixtures of solids. It is worth of note that physical methods can also be used to separate liquid mixtures. For instance, the fractional distillation of petrol is a physical process. Chemical procedures can separate compounds, but components cannot be broken down further. In other words, chemical methods/reactions can split a complex into simpler compounds. Chemical processes or physical mechanisms cannot break down elements into simpler compounds. Also, note that elements are further divided into electron, proton and neutron but this separation is neither by physical or chemical methods.
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A technique for determining protein structure that requires crystals of the protein is ___.
A technique for determining protein structure that requires crystals of the protein is X-ray crystallography.
The structure of protein can be of four types: (a) primary structure; (b) secondary structure; (c) tertiary structure and (d) quaternary structure. The primary structure is the most simple one with a linear chain of amino acids. Secondary structure can be alpha helix or beta sheets, tertiary structure is the folded state of secondary structure and quaternary structure is the combination of two or more tertiary structures.
X-ray crystallography is the technique through which the 3-D structure of a protein crystal can be determined. The crustal of protein is a highly purified form. Atomic as well as molecular structure can be determined by this technique.
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Ibuprofen is a drug commonly used to relve inflammation and pain, it is a mixture of two enatiomes whicha re moldules that:_______.
Answer:
Зато хохлосвиней умеешь поддерживать , мерзавец. И глупую Украину, как Америка. Путин молодец!!! Америке скоро пипец будет , а Россия будет процветать.
Explanation: Такой же тупой америкос как те укры в Украине
The probability that a person with a positive screening test actually has the disease screened for is called:________
The probability that a person with a positive screening test actually has the disease screened for is called: Positive predictive value.
A screening test is a medical test or treatment carried out on members (subjects) of a designated asymptomatic population or population subgroup to determine the likelihood that their members will have a specific condition. It is also referred to as medical surveillance.
When a person does not exhibit any symptoms of a condition, a screening test is performed to look for probable health issues or diseases. The objective is early identification, lifestyle modifications, or surveillance to lower the risk of disease or to identify it early enough to receive the best possible care. Screening tests are used to identify a subset of the population who should undergo additional testing to ascertain the existence or absence of disease, even if they are not thought of as diagnostic.
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When environmental conditions around a bacterium are either a neutral ph or an alkaline ph, the surface of a bacterium will:__________-
When environmental conditions around a bacterium are either a neutral ph or an alkaline ph, the surface of a bacterium will: have a negative charge
To identify if a bacterium has a negative charge a gram stain must be performed, this is a rapid laboratory test used to detect the presence of bacteria that cause an infection, if the result of the gram stain is red the bacteria are gram negative.
What is a bacteria?It is a microorganism formed by a single cell, of small size. Its cellular structure is prokaryotic and it is characterized by not having a nucleus.
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A desirable nutrition state occurs when body tissues have enough essential nutrients from ______ of foods to support metabolic functions.
A desirable nutrition state occurs when body tissues have enough essential nutrients from a variety of foods to support metabolic functions.
What is metabolic function ?Your body uses a process known as metabolism to turn food and liquids into energy. This complex process, which includes calorie-dense foods and beverages, allows your body to release the energy it needs to function.
What are the metabolic processes?Some of these are catabolic routes, such as amino acid catabolism -oxidation (the breakdown of fatty acids), and glycolysis (the breaking of glucose). Others are anabolic processes, such as those involved in triglyceride synthesis and energy storage (such as glycogenosis) (lipogenesis).
Metabolic processes include the chemical reactions that keep you alive. One example of metabolism is the rate at which you burn fat and consume calories. the constant anabolic and catabolic chemical and physical processes that occur in living things and their cells.
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Which types of drugs taken by a pregnant patient are more likely to have effects on a fetus? a.protein-bound drugs b.ionized drugs c.drugs that are highly polar d.lipid-soluble drugs
(D) Drugs that are lipid-soluble cross the placenta more easily. Highly polar, ionised, or protein-bound medications have a hard time crossing the placenta.
Why are drugs lipid soluble?Lipid-soluble medicines diffuse more quickly because the cell membrane is lipoid. Larger molecules typically take longer to cross membranes than smaller ones. The majority of pharmaceuticals are weak organic acids or bases that exist in aquatic environments as both ionised and unionised forms.
The gut wall and liver substantially process the more lipophilic medications (first-pass metabolism). The variability of this first-pass clearance can lead to 20-fold variations in the plasma drug concentrations of patients who received the same dose. Additionally, it makes patients with hepatic disease, particularly cirrhosis, more susceptible to pharmacological interactions with substances that change the hepatic drug metabolism, such as cimetidine.
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Carrier proteins are slow, and can only move between ______ and_____ molecules per second.
Carrier proteins are slow, and can only move between 1,000 and 1,000,000 molecules per second.
What is Carrier protein?Carrier protein is a type of cell membrane transport protein involved in facilitated diffusion and active transport of substances out of or into the cell or the movement of ions, small molecules, macromolecules, across a biological membrane. Carrier proteins diffuses sugars, amino acids, and nucleosides. An example of a carrier protein is the sodium potassium pump that uses ATP to move three sodium ions out of the cell and two potassium ions into the cell.
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Single-celled organisms that cause a variety of diseases in animals, plants, and humans and may also produce extremely potent toxins inside the human body are?
Single-celled organisms that cause a variety of diseases in animals, plants, and humans and may also produce extremely potent toxins inside the human body are known as bacteria.
What are Diseases?Diseases may be defined as any circumstance that significantly involves harmful divergence from the normal structural or functional condition and state of an organism. It is generally associated with certain indications and symptoms and differs in nature from physical injury.
Bacteria are single-celled organisms that remarkably lack a well-defined nucleus and other membrane-bound cell organelles. These organisms are capable of inducing a variety of diseases in animals, plants, and humans and may also produce extremely potent toxins inside the human body.
Therefore, bacteria are single-celled organisms that cause a variety of diseases in animals, plants, and humans.
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5. Why are SI units used so often in science?
a.
Factors of 10 are easier work with mathematically.
b. SI units are bigger than English System units.
Factors of 3, 12, and 5,280 are easier to remember.
d. SI units are more accurate than English System units.
C.
The conversion foot
6
The SI units are preferred because factors of 10 are easier to work with mathematically.
What is the SI unit?We know that there are units that are common to many countries such as the English units and the American units. Now we know that the plentitude of units makes it confusing to use and hence there is a lack of consistence in the reportage of scientific data.
Hence, we know that it is common for many scientists to report research in the SI unit for the scientific community. Hence the SI units are so common in science because factors of 10 are easier to work with mathematically.
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Blood vessels become _______________ and more _________________ enter the damaged tissue.
Blood vessels become wider (dilate), allowing and more blood to enter the damaged tissue.
What are blood vessels and its function?Blood is delivered to human tissues by blood arteries, which act as conduits or channels. Two tube-like closed systems comprised of the vessels start and stop at the heart. Blood is transported from the right ventricle to the lungs and back to the left atrium by one system, the pulmonary arteries.
What three types of blood vessels are there?Over 60,000 miles of arteries, veins, and capillaries make up this extensive network of blood vessels. That is long enough to do two additional world trips. Your body's blood vessels continuously carry blood.
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The muscle contraction mechanism that moves an egg down the fallopian tube toward the uterus is the same mechanism that moves?
The muscle contraction mechanism that moves an egg down the fallopian tube toward the uterus is the same mechanism that moves food from the esophagus to the stomach.
The food we eat is swallowed down by the esophagus. The food is moved down by the muscular contractions of the layers of the esophagus. These movements are called peristaltic movements or peristalsis. These peristaltic waves also help in the movement of food down the stomach into the intestine and then to the anus.
The ovum is released by the ovaries and is captured by finger-like projections of the oviduct. The fallopian tube or the oviduct allows fertilization in its ampullary region by the sperm. The mucosal lining of the fallopian tube releases some secretions into it for the nourishment of egg and sperm. These secretions include glucose, bicarbonate, calcium, sodium, chloride, and proteins. The mucosal lining has cilia which aid in the movement of a fertilized egg, called a zygote, toward the lumen of the uterus.
The distance covered by the zygote toward the lumen is dependent upon the peristalsis of the fallopian tube. Similarly, the food moved down the esophagus from the mouth to the stomach or anus is dependent upon the peristalsis of the esophagus and stomach linings.
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Jay built a model of the solar system. What sort of information will his model be able to explain? What type of information would his model be unable to explain?
Answer:
the answer is
Explanation:
his model will be able to explain these
a) the positions of sun and planets
b) the modern solar system including planets
c) the distances between each planet from the sun
d) how many moon does each planet has
his model won't be able to explain these
a) how does the movement around the sun accur
b) what times and seasons of the year does the planet change
c) what's the times and ellipse could happen
.
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explain how atp is formed and broken down in the body
Answer:
ATP is able to power cellular processes by transferring a phosphate group to another molecule (a process called phosphorylation). This transfer is carried out by special enzymes that couple the release of energy from ATP to cellular activities that require energy.
A difference in solute concentration can exist between the cytosol and the interstitial fluid because the ______ prevents their movement.
A difference in solute concentration can exist between the cytosol and the interstitial fluid because the phospholipid bilayer prevents their movement.
What is the phospholipid bilayer?Phospholipid bilayer is a thin polar membrane made of two layers of lipid molecules.
A difference in solute concentration can exist between the cytosol and the interstitial fluid because the phospholipid bilayer prevents their movement.
The phospholipid bilayer is composed of saturated and unsaturated fatty acids it is referred as the backbone of all cellular, synaptosomal, and vesicular membranes.
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Mechanical stress from manual labor accelerates keratinocyte multiplication. this results in formation of:________
Mechanical stress from manual labor accelerates keratinocyte multiplication. this results in formation of: callus
What stage of a keratinocyte's existence is it in?A basal keratinocyte has recently undergone mitosis to split into two new basal keratinocytes in the basal layer of the skin, the innermost stratum. This newly formed cell begins to divide, giving rise to numerous other keratinocytes.
During their about one-month long life cycle, keratinocytes undergo morphological modifications. From the basal layer, where keratinocytes are formed, to the superficial layer, where they die and separate from the epidermis, the changes occur gradually.
Depending on whether they are differentiated or undifferentiated, keratinocytes can range in size. In vivo, the size is thought to range from 15 to 50 micron.
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respira
photosynthesis are two of the major processes involved in cycling carbon
through the carbon cycle. Examine the model. How does cellular respiration cycle carbon
compounds through the biosphere? Choose the TWO choices that apply.
Sunlight
Carbon Cycle
CO₂ in the
atmosphere
Photosynthesis
by producers
Plant
respiration
Carbon fixation
by consumers
Animal
respiration
Decomposition
Fossils and fossil fuels
Fossil fuel
combustion
Cellular respiration absorbs carbon dioxide from the atmosphere.
Cellular respiration releases carbon dioxide into the atmosphere.
Cellular respiration uses carbon containing compounds to produce ATP.
Cellular respiration absorbs carbon containing compounds from the soil.
Cellular respiration releases carbon containing compounds into the soil.
Which layer of the atmosphere holds the ozone layer?
Answer here
__________
Answer:the stratosphere
Explanation:
Answer:
The ozone layer is one layer of the stratosphere, the second layer of the Earth's atmosphere
The full meaning of WAI
Answer:
WA means Withdrawn Administratively.
Explanation:
The most radiosensitive period during pregnancy for radiation induced congenital abnormalities is during the _____________________.
The first trimester of pregnancy is the most radiosensitive time for radiation-induced congenital abnormalities.
An abnormality that is present at birth is what?A structural or functional anomaly that develops intrauterinally is referred to as a congenital anomaly. These illnesses, which are also known as birth defects, congenital disorders, or congenital abnormalities, arise during pregnancy and can be diagnosed before or at delivery as well as later in life.What common anomalies of birth are there?Down syndrome, neural tube problems, and heart defects are the most prevalent serious birth disorders. The precise causes of birth malformations are frequently difficult to pinpoint, even if they may be due to one or more genetic, viral, dietary, or environmental factors.
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If dev also has an absolute advantage in growing strawberries and raspberries , he will _________.
Have a competitive advantage in one of the activity but not both.
If dev also has an absolute advantage in growing strawberries and raspberries , he will have a competitive advantage in one of the activity but not both.
What is comparative advantage?Comparative advantage is the capacity of an economy to produce a particular good or service at a lower opportunity cost than its trading rivals.The notion of comparative advantage explains why trade may benefit people, countries, or businesses.The importance of comparative advantageCompanies that enjoy a comparative advantage can provide their goods and services at lower prices than their competitors, which boosts their profit margins and increases their sales margins.How is comparative advantage determined?If a country produces a good or service with the lowest opportunity cost, it is said to have a comparative advantage.To learn more about comparative advantage visit:
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