Proteins called ________ surround/associate with dna to help organize it. these proteins can be modified to alter gene expression.

We feel hotter in summer than in winter because the temperature is generally higher than in winter.

There are three seasons on earth namely winter, summer, and rainy season. In the winter season, the temperature is cold and during summer the temperature is higher.

Timing and characteristic of season depend upon the location of the earth. The time of a year region experience season depends on it is northern hemisphere or southern hemisphere.

The southern hemispheres experiences winter while northern hemisphere experiences summer. The cycle of seasons is caused by earth's tilted towards the earth. The planet rotates around an axis.

Therefore, We feel hotter in summer than in winter because the temperature is generally higher than in winter.

To learn more about seasons, refer to the link:

https://brainly.com/question/19009677

#SPJ2

To hunt and kill a wildebeest, 4 lions need to be in on the hunt.

To measure the energy we use the unit kilo calories (kcal).

Given that the total energy cost to hunt and kill a wildebeest is 50,000 kcal and the maximum energy that can be spent by a lion is 15,000 kcal.

The number of lions needed to hunt and kill a wildebeest can be calculated by dividing 50,000 kcal by 15,000 kcal

Number of lions = 50,000/15,000

                           = 3.33 lions

As this value is not a whole number, the number of lions can either be 3 or 4.

As 3 lions will not be enough for the hunting, therefore 4 lions are needed.

Thus, to hunt and kill a wildebeest, 4 lions need to be in on the hunt.

Read more about Energy:

https://brainly.com/question/8992795

#SPJ4

Dr. chu studies the environmental influences on gene expression by studying identical twins that have been reared apart. Dr. Chu's field of study is called epigenetics.

Gene expression is the process from which the functional proteins are made from a gene by the processes of transcription and translation. First m-RNA is formed from the DNA and the  it is translated to form the protein. All the proteins formed inside the body are a result of gene expression.

Epigenetics is the study of reversible changes in the gene. These changes are not inherited to the further generations. The environmental factors are the major reason for thee changes. The changes could be methylation, acetylation, etc.

To know more about methylation, here

brainly.com/question/2670031

#SPJ4

If earth is a closed system then we can't bring anything in or out.

A closed system is one in which only energy can be transported while no matter does, meaning that only energy can enter and exit the system while no matter does. Since it permits energy to enter and exit, the closed system can alternatively be said to be partially open.

An open system is one in which matter and energy are actually being transported or exchanged. Both matter and energy are able to enter and exit the system. In terms of the exchange of stuff, Earth is unquestionably a closed system, but it is an open system for the movement of energy. Therefore, under the said circumstances in terms of the outcome of environmental problems, we are unable to bring anything in or take anything out.

Here is another question with an answer similar to this about a closed system: https://brainly.com/question/14782983

#SPJ4

According to Freud, if a psychosexual conflict is not readily resolved, the child may develop a fixation on the issue and therefore a psychological problem associated with this matter.

The psychosexual conflict in Freud's thinking refers to any type of fixation on an earlier development because he believed that children face different conflicts that should be solved in order to continue the next step.

In conclusion, according to Freud, if a psychosexual conflict is not readily resolved, the child may develop a fixation on the issue and therefore a psychological problem associated with this matter.

Learn more about fixation and Freud's thinking here:

https://brainly.com/question/14960849

#SPJ1

The cells that support neurons by insulating them, synchronizing activity among neighboring neurons, and removing waste products are known as glial cells.

Glial cells or gliocytes are non-neuronal cells found in the nervous system. They are called non-neuronal cells because they do not have an action potential or produce electrical impulses. Therefore, they don't partake in information transmission.

Glial cells act as the 'housekeepers' of the nervous system. They hold and support neurons in place, supply oxygen and nutrients to the neurons, help to isolate one neuron from another, remove waste products and dead neurons, and help destroy pathogens.

There are various subtypes of glial cells, including the astrocytes, oligodendrocytes and microglia.

Learn more about the nervous system here:

https://brainly.com/question/24217914

#SPJ4

Genetically engineered (GE) seeds were commercially introduced in the United States for major field crops in 1996, with adoption rates increasing rapidly in the years that followed.

Currently, more than 90 percent of U.S. corn, upland cotton, and soybeans are produced using GE varieties.

Most of these GE seeds are herbicide tolerant (HT), insect resistant (Bt), or both (stacked). The share of U.S. soybean acres planted with HT seeds rose from 7 percent in 1996 to 68 percent in 2001.

Adoption rates for HT corn grew relatively slowly at first but then plateaued at 89 percent in 2014. Meanwhile, the share of Bt corn acreage grew from approximately 8 percent in 1997 to 82 percent in 2020.

For more information on genetically modified crops click on the link below:

https://brainly.com/question/13650167

#SPJ4

All the fields of biology share one trait in that they are employed to investigate various aspects of all naturally occurring living things and offer knowledge about their development, reproduction, structure, and demise.

There are several interconnected fields that makeup biology. Evolution, molecular biology, physiology, cell biology, zoology, microbiology, medicine, botany, genetics, marine biology, and ecology are the several subfields of biology.

Biology is the branch of science concerned with examining living things and their biological processes (Greek words, bios – life, logos – study). All facets of the study of living things are covered, including their occurrence, classification, ecology, economic significance, exterior shape, organization, internal structure, nutrition, health, and other bodily functions, as well as their reproduction, life histories, heredity, and origins. The term biology is sometimes substituted with the terms "life sciences" or "biological sciences" since they are more inclusive and multidisciplinary. The "Father of Biology" is Aristotle. Lamarck is credited with coining the term "biology."

To learn more about Biology please visit-
https://brainly.com/question/14596078
#SPJ9

The structures that guard the nostrils and ear canals, preventing particles from entering is called guard hairs or vibrissa.

The nostril is either of the two orifices located on the nose and used as a passage for air and other gases to travel the nasal passages.

The ear canal is the tube or meatus running from the outer ear to the eardrum through which sound enters.

These two locations are very tender and delicate, which indicates that they need extreme protection from danger.

Also, since they are tubes or passage areas to the internal parts of the body, they require protection to prevent foreign particles from entering.

Therefore, the structures that guard the nostrils and ear canals, preventing particles from entering is called guard hairs or vibrissa.

Learn more about nostrils at: https://brainly.com/question/23775649

#SPJ1

Of the various types of skeletal muscle fibers, the type that produces the most power is Fast glycolytic fibres.

Skeletal muscle fibers are the muscle fibres that are responsible voluntary movement of the body.

There are three types of skeletal muscles slow twitch oxidative, fast twitch oxidative and fast twitch glycolytic.

slow twitch support support the long distance endurance activities like marathon running. Fast twitch muscle support quick , powerful movements such as sprinting or weightlifting.

Fast twitch glycolytic fibres are fast twitch muscle which are converted via endurance training.  They are larger in diameter and have more mitochondria and blood supply.

It is the most powerful type of the skeletal muscle fibres

To learn more about skeletal muscle fibers here

https://brainly.com/question/15242112

#SPJ4

The small, almond-shaped organs of the female reproductive system, suspended by ligaments in the upper lateral portion of the pelvic cavity are known as ovaries.

Ovaries are oval-shaped so are also termed almond-shaped organs and are present on the sides of the uterus in females. In females, the processes of pregnancy and ovulation which is also termed menstruation are controlled by the hormones that are made by ovaries. These hormones include estrogen and progesterone. Another major function of the ovary is that it releases the female gametes known as eggs during the menstrual cycle.

The ovaries are attached to two types of ligaments which are the ovarian ligament and suspensory ligament. Ovaries are connected to the womb by the ovarian ligament while the suspensory ligaments of the ovary contain the ovarian vessels and nerves.

To learn more about ovaries, click here:

https://brainly.com/question/1305741

#SPJ4

A desirable nutrition state occurs when body tissues have enough essential nutrients from a variety of foods to support metabolic functions.

The Metabolic function may be characterized as the instance when your body utilizes a process known as metabolism in order to convert food and liquids into energy.

This complicated approach significantly includes calorie-dense foods and beverages that remarkably authorize your body to liberate the energy it requires to function.

Metabolic processes typically include numerous chemical reactions that keep you alive. One major example of metabolism is the rate at which you burn fat and consume calories. The constant anabolic and catabolic chemical and physical processes that take place in living things and their cells.

Therefore, a desirable nutrition state occurs when body tissues have enough essential nutrients from a variety of foods to support metabolic functions.

To learn more about Metabolic functions, refer to the link:

https://brainly.com/question/4100135

#SPJ4

The tissue is simple squamous epithelial cell. It helps in diffusion of gases and exchange of nutrients in the body.

Squamous epithelial cells are the type of simple epithelial cells, made up of  single layer of cells. They are flat, thin and polygonal in shape. They are arranged in a single layer on a basal membrane. Squamous cells have nucleus in the centre.

These cells are present in the lining of the alveoli in lungs and in the glomerulus in nephrons. They facilitate gaseous exchange in alveoli. In glomerulus they help in exchange of nutrients and elimination of wastes from blood capillaries.

Thus, squamous cells have important function of transport and absorption in the body.

Learn more about squamous cells, here:

https://brainly.com/question/26424277

#SPJ1

True: Transmembrane proteins move ions or molecules across a membrane against their concentration gradient.

Transmembrane proteins function as gatekeepers by allowing or preventing the entry or exit of the ions or molecules across the cell membrane. The transmembrane proteins can function on both sides of the bilayer membrane and transport solutes across it. The transport of ions or molecules across a membrane against the concentration gradient of the transmembrane proteins is done by active transport.

The transfer of proteins by transmembrane proteins or transporters is performed by two mechanisms: facilitated diffusion or active transport. Facilitated diffusion allows molecules to pass through the membrane without the use of greater energy by simple diffusion. Whereas, active transport uses the energy in the form of ATP and forces the molecules or solutes to pass through the membrane against the concentration gradient.

We can now say that transmembrane proteins move ions or molecules across a membrane against their concentration gradient. This transport is generally aided by a mechanism called active transport.

To know more about transmembrane proteins, refer to the following link:

https://brainly.com/question/14778523

#SPJ4

Blood flows in layers within the lumen of blood vessels, with the layers in the middle of the lumen flowing fastest. this is known as laminar flow.

The majority of the circulatory system typically operates with laminar flow. It is characterised by parallel motion of concentric layers of blood along a blood vessel's length. The middle of the vessel has the highest velocity (Vmax).

Learn more about Laminar blood flow here:

https://brainly.com/question/23014757

#SPJ4

The incretins are classic hormones signaling molecules.

Endocrine signaling serves as an illustration of long-distance communication between cells, organs, and glands that produce hormones and cells that contain hormone receptor molecules. In order to be dispersed throughout the body, hormones must typically be secreted into the bloodstream as tiny molecules called glycoproteins. Although the brain is frequently the source of endocrine signals, other glands and organs, such as the thyroid, stomach, pancreas, liver, kidneys, and reproductive organs, also create hormones.

A group of hormones involved in metabolism called incretins encourage a drop in blood glucose levels. As a result of a blood glucose-dependent process, incretins are generated after meals and increase the secretion of insulin from pancreatic beta cells of the islets of Langerhans. Signals, also known as class hormone signals, are molecules.

They play a variety of physiological tasks, one of which is controlling the amount of insulin released after meals. There are two incretins: glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic peptide (GIP) (GLP-1). Endocrine signals, often referred to as class hormone signals, are chemicals that make up incretins.

To learn more about signaling molecules. Click, https://brainly.com/question/12406059.

#SPJ4

The ancestral population may have divided into two descendent species, which might be shown as a fork in the tree.

Ancestral population- Things that are ancestral have been there for so long that they were originally owned by our ancestors, the relatives who lived before our grandparents. Our great-grandparents' or great-great-former uncle's residence is known as our ancestral house.

Descendent species- An individual, race, species, or other entity that descends from or is related to an earlier form when referring to a human, animal, or plant.

A phylogenetic tree, sometimes called a phylogeny, is a diagram that shows the evolutionary branches from which various species, creatures, or genes have descended from one another.

To know more about the Phylogenetic tree, click on the below link,

https://brainly.com/question/13577065

#SPJ4

Eukaryotic cells are different from prokaryotic cells in the following ways:

Eukaryotic cells are complex cells in which the genetic material is organized into membrane-bound nuclei.

On the other hand, prokaryotes are organisms whose cells are characterized by the absence of a nucleus or any other membrane-bound organelles.

Therefore, it can be said that eukaryotic cells are different from prokaryotic cells in the following ways:

The options to the incomplete question is as follows:

Learn more about eukaryotic cells at: https://brainly.com/question/11351358

#SPJ1

Answer:

Humans originated from Africa around 200,000 - 2 million years ago. There is fossilized evidence from back then that tells us when we humans may have formed. We went through about 15 different evolutions until coming to what we are today. To answer your other question, no, we are not alone in the universe, because we are united with many other organisms and life forms that live alongside us.

Hope this helps!

Any one of the three cellular layers formed during animal embryogenesis and later differentiated to become the various organs and tissues of the organism are referred to as the "germ layer." Three early cell groupings or starting tissues are the ectoderm (cells on the outside), endoderm (cells inside), and mesoderm.

Endoderm is responsible for the development of the lungs, throat, thyroid, parathyroid, stomach, colon, liver, pancreas, urine bladder, the lining of the urethra, epithelial parts of the trachea, and intestines.

The skeletal, connective tissue, urogenital system, heart, blood (lymph cells), spleen, dermis of the skin, crystal lens of the eye, and skeletal muscle are all developed from the mesoderm.

The ectoderm is responsible for the development of the mammary glands, the central nervous system, the eye's lens, the ganglia and nerves, pigment cells, the connective tissues of the head, the epidermis, and the skin.

Learn more about germ layers here:
https://brainly.com/question/13506731

#SPJ4

Diffusion is the movement of molecules from an area of high concentration of the molecules to an area with a lower concentration. For cell transport, diffusion is the movement of small molecules across the cell membrane.

The transfer of particles from a region of higher concentration to one of lower concentration is known as diffusion. The total result equalises focus across the board for the medium.

Learn more about Diffusion here:

https://brainly.com/question/8880115

#SPJ4

The largest mass of living material on earth comes from the largest mass of living material on earth comes from microorganisms

A living thing that can only be observed under a microscope. Protozoa, algae, fungus, and bacteria are all examples of microorganisms. Viruses are occasionally categorised as microbes even though they are not thought of as living things.

Learn more about Microorganisms here:

https://brainly.com/question/8695285

#SPJ4

Located on the basilar membrane are(is) the organ of Corti containing hair cell sensory receptors for the sense of hearing.

The organ of Corti is also called basilar papilla which is a complex form of neuroepithelium composed of hair cells sensory receptors and supporting cells. In addition to these sensory and supporting cells, the organ of Corti also consists of a tectorial membrane. Endolymph which is a potassium-rich fluid surrounds the organ of Corti. The organs known as scala tympani and scala vestibule are present under and above the basilar papilla respectively.

The function of the organ of Corti is to generate electrical signals based on the sounds and transmit these signals to the brainstem through the passage of auditory nerves.

To learn more about the organ of Corti, click here:

https://brainly.com/question/11159063

#SPJ4

The five regions of the vertebral column are the Cervical region, Thoracic region, Lumbar region, Sacral region, and Coccygeal region. Each region in vertebrae possesses a differentiating feature.

The vertebral column is divided into the following five regions, starting from the skull:-

1.Cervical region

2.Thoracic region

3.Lumbar region

4.Sacral region

5.Coccygeal region

The vertebral column consists of 26 serially arranged units called vertebrae. The vertebral column protects the spinal cord, supports the head, and also serves as the point of attachment for ribs and muscles of the back.

The vertebral column is divided into the following five regions, whose differentiating features are mentioned:-

Cervical Region - They are seven in number and their distinguishing feature is that they have spinous processes which bifurcate at the distal end.

Thoracic region- There are 12 thoracic vertebrae and their differentiating feature is that they are specialized to articulate with the ribs.

Lumbar Vertebrae- These vertebrae are 5 in number and their distinguishing feature is that they are kidney-shaped.

Sacral and Coccygeal region- These are 2 in number and both regions contain fused vertebrae, unlike other regions where they are attached but not fused.

To know more about "vertebral column", refer to the following link:

brainly.com/question/28499017

#SPJ4

The change of phase of water from liquid to gas is known as evaporation.

Evaporation is one of the major processes in the hydrologic cycle. The hydrologic cycle represents the cyclic movement of water molecules across various spheres of the earth.

During evaporation, water molecules in liquid form gain energy and transform into gas molecules, otherwise known as water vapor.

Evaporation represents one of the processes that lead to the formation of clouds. The condensation of the evaporated water leads to precipitation.

More on evaporation can be found here: https://brainly.com/question/5019199

#SPJ1

The invaginations of the mitochondria, which increase the surface area of the inner membrane, are called cristae.

Mitochondria is the double membranous cell organelle. It is also referred as: powerhouse of the cell. This is because mitochondria is associated with the formation of energy for the cell. Mitochondria also possess its own DNA. Cells like the muscle cells more amount of mitochondria as they require more energy.

Cristae are the finger-like projections of the inner membrane of mitochondria. They are supposed to increase the surface area of the organelle so that more amount of ATP can be produced for the cell. At the membrane is embedded the ATPase that produces the ATP.

To know more about cristae, here

brainly.com/question/20839675

#SPJ4

An action potential is generated by the movement of positive ions

Action potentials are short electrical signals that neurons use to interact with one another. The movement of certain ions into and out of the neuron causes these fleeting changes in the voltage across the membrane. The membrane is primarily permeable to K+ when the body is at rest, which causes the membrane potential to form. In response to depolarization, an action potential starts at the axon hillock. An electrical stimulus causes voltage-gated sodium ion channels to open during depolarization. The positive charge of the sodium ions causes them to rush back into the cell, shifting the potential there from negative to more positive. An action potential is generated when a threshold potential is met. Only once a threshold has been met will action potentials happen.

Following depolarization, voltage-gated sodium ion channels start to shut. Voltage-gated potassium channels open as a result of the positive potential inside the cell, and K+ ions then exit the cell via their electrochemical gradient. The membrane potential shifts more negatively and begins to get closer to the resting potential as the K+ leaves the cell.

To learn more action potential. Click, https://brainly.com/question/4305583

#SPJ4