What is the function of steroids/sterols to a cell.
A steroid is an organic molecule having four rings organized in a certain chemical configuration that is physiologically active. The two main biological roles of steroids are as signaling molecules and as critical elements of cell membranes that affect membrane fluidity. Numerous steroid species can be found in fungi, animals, and plants. Lanosterol (opisthokonts) or cycloartenol are the two sterols used to make all steroid compounds in cells (plants). Squalene, a triterpene, is cyclized to produce lanosterol and cycloartenol. The most known examples of steroids acting as signaling molecules are steroid hormones. Steroids and phospholipids are also parts of cell membranes. Cholesterol and other steroids make membranes less fluid.
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Pick an organism and tell me, in great detail, how that organism maintains homeostasis.
In order to maintain homeostasis, the desert rat:
lives in burrows built in the desertmaintains a nocturnal lifestyle has little fur What is homeostasis?Homeostasis is the process by which a living organism maintains a fairly constant internal environment.
Homeostasis refers to the mechanisms by which a organism responds to internal as well as external environmental changes.
All living organisms possess a mechanism for maintaining homeostasis.
A typical organism that maintains homeostasis is the desert rat.
The desert rat lives in the very harsh environment of the desert where there is extreme heat.
In order to maintain a fairly constant internal environment, the desert rat lives in burrows built in the desert. Also, the desert rat maintains a nocturnal lifestyle coming out in the dark when the temperatures have reasonably cooled.
Also, the desert has little fur so that the body can easily lose heat.
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Are the lighter elements found at the top or the bottom of the periodic table?
Answer:
Top
Explanation:
mass increases from left to right and from top to bottom.
so lighter ones are at the top
9. Why does it rain more in summer and less in winter in India?
Answer:
not just In India
Explanation:
the reason is that the Summer is more hot and warmer than the winter so the weather will evaporate and that's what cause the rain in the hot weather other than the winter which it already cold
BRAINLEST GOES TO WHOEVER ANSWERS CORRECTLY
Answer: 3 Oxygen atoms
Explanation:
The subscript next to "O" is 3. Therefore 3 oxygen atoms. See attached
Pests destroy approximately what percentage of all food crops?
A. 1/20
B. 1/3
C. 9/10
D. 3/4
Juan received a class assignment to write about organisms that live in extreme environments. While doing research online, he found an image that showed microbial bodies thriving in hot springs. The organisms lacked a nucleus or defined organelles. Which organisms can he possibly find in such conditions
A.
plant-like protists
B.
animal-like protists
C.
fungus-like protists
D.
archaea
Reset Next
Pretest: Organization of Organisms
© 2022 Edmentum. All rights reserved.
The organism found to lack a nucleus or defined organelles that can possibly be found in such conditions is Archaea (option D).
What is Archaea?Archaea is a member of the kingdom Archaea known to be able to survive in extreme environmental conditions, hence, they are called extremophiles e.g. Archeaebacteria.
According to this question, Juan received a class assignment to write about organisms that live in extreme environments. However, while doing his research online, he found an image that showed microbial bodies thriving in hot springs. The organisms lacked a nucleus or defined organelles.
This suggests that the organism is prokaryotic and lives in an extreme condition, hence, will likely belong to the group of organisms called Archaea.
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Why do classification systems change over time?
• Scientists find new evidence in their studies.
• Scientists use old methods of classification.
• Scientists repeat experiments and find no changes.
• Scientists find similar evidence to previous work.
Answer: Scientists find new evidence in their studies.
Explanation: It's correct on EDG
HELP ME ASAP 18. Why do animals in cold environments need a lot of lipids in their cells? ok
Answer:
As temperature increases, so does phospholipid bilayer fluidity. At lower temperatures, phospholipids in the bilayer do not have as much kinetic energy and they cluster together more closely, increasing intermolecular interactions and decreasing membrane fluidity.
Explanation:
When temperature decreases, the composition of membrane lipids (phospholipid fatty acids) is expected to become more unsaturated to be able to maintain homeoviscosity.
4. Carbon dating would work best on which of the following items?
Oan animal bone from 100,000 years ago
a stone tool from 2000 years ago
O a wood tool from 100 years ago
a neanderthal bone from 40,000 years ago
The carbon dating technique would only be best for a Neanderthal bone from 40,000 years ago.
What is carbon dating?
Organisms are known to exchange [tex]^{14} C[/tex] with their environment while they are alive. There are two types of carbon isotopes which are carbon 12 and carbon -14.
The carbon -14 is known to be radioactive. As such, the decay of the carbon - 14 isotope could be used to obtain the age of the sample of the radioactive sample.
Again, it is known that the limit of the accuracy of the carbon-14 system of dating technique lies around 50 000–60 000 years. It then follows that the carbon dating technique would only be best for a Neanderthal bone from 40,000 years ago.
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Active transport requires energy and moves molecules from where there areless of them to where there are more of them.
(A) True
B False
Answer:
(B)False
Explanation:
active transport is the movment from a region of higher to a region o lower concentration
In this way, the exergonic reaction of ATP hydrolysis is ____________ to an endergonic reaction.
In this way, the exergonic reaction of ATP hydrolysis is coupled with an endergonic reaction.
What is ATP hydrolysis?ATP hydrolysis is an exergonic chemical reaction because this releases energy, which is coupled to an endergonic reaction inside the cell that needs the energy to perform metabolic functions such as, for example, chemical reactions involved in cell differentiation.
In conclusion, In this way, the exergonic reaction of ATP hydrolysis is coupled with an endergonic reaction.
Complete Question:
Fill in the blank. In this way, the exergonic reaction of ATP hydrolysis is ____________ to an endergonic reaction.
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Why are some reactions exothermic?
A The products have higher entropy than the reactants.
B) They are spontaneous.
The products have lower potential energy than the reactants.
D) They are not spontaneous.
please help!! i only have 10 min
According to Linnaeus, which of the following applied to minerals?
A. They grow.
B. They grow and live.
C. They grow, live, and feel.
D. None of the above.
Answer: d
Explanation: minerals are non-life
What type of eye protection is required in a lab? a. Lab-grade goggles all the time for anyone working with chemicals b. Lab-grade goggles all the time for everyone c. Lab-grade goggles if you don’t wear glasses.
In the Bee movie What happened to the flower shop when the bees stopped working and why?
Answer:it blewed up
Explanation:
kaboom
Answer:
the bees got a bunch of honey so they did not have to get any
Explanation:
D Learning Task No.2: Use the GRESA Method in solving the problem below. Show your solutions. Write your answers in your notebook. 1. What is the mass of the cart with a constant net force of 200N is exerted to accelerate from rest to a velocity of 40m/s in 10 s. C. 50 kg D. 500 kg 2. A. 0.5 kg B. 5 kg What is the acceleration of a ball with a mass of 0.40 kg is hit with a force of 16N? A. 0.4 m/s² C. 400 m/s² D. 4000 m/s² B. 40 m/s² 3. What is the external net force exerted on a 3.5 kg papaya, which is being pushed across a table and has an acceleration of 2.2 m/s² to the left? A. 7.0N to the left C. 7.7N to the left B. 7.5N to the right D. 7.7N to the right 4. What is the mass of a crate with a net force of 300N and accelerate it by 0.750 m/s²? A. 0.4 kg B. 4 kg C. 40 kg D. 400 kg
GRESA method stands for given, required, equation, solution and answer.
We are required to solve the question according to the GRESA method. However, the question has multiple sub questions and hence we will solve each one of them separately.
Question 1:
Given:
Net force of 200N
initial velocity is 0 m/s
final velocity is 40 m/s
time is given to be 10 s
Required:
We are required to find the mass of the cart.
Equation:
By using Newton's second law of motion,
F= m x (v-u)/t
Solution:
By putting all the values, we get:
200N = m x ( 40 -0 ) / 10
m = 200 /4 = 50kg
Answer:
The weight of the cart is 50kg.
Hence option (c) 50kg is correct
QUESTION 2:
Given:
mass of ball = 0.4 kg
force of hitting = 16N
Required:
We are required to find the acceleration of the ball after hitting
Equation:
Using Newton's law of motion,
F = m x a
Solution:
By putting all the values, we get:
16 = 0.4 x a
a =16/0.4 = 40 m/s^2
Answer:
Hence option (B) 40 m/s^2 is the correct answer
QUESTION 3:
Given:
mass of papaya =3.5kg
acceleration of papaya = 2.2 m/s^2
Required:
We are required to find the net force applied
Equation:
Using Newton's law of motion,
F = m x a
Solution:
By putting all the values we get:
F = 3.5 x 2.2
=7.7 N
Answer:
The external force applied is 7.7 N to the left
Question 4:
Given:
net force = 300N
acceleration = 0.750 m/s^2
Required:
We are required to find the mass of the crate
Equation:
By using Newton's second law of motion,
F= m x a
Solution:
By putting all the values, we get:
300 = m x 0.750
m = 300/0.750
= 400kg
Answer:
Hence the weight of crate is 400kg
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The shape of a protein molecule is influenced by
Answer:
the amino acid
Explanation:
maybe this is the answer!!!
A cell devoid of tumor-suppressor genes would lose the ability to
Answer:
cells can divide without order and accumulate genetic errors that can lead to a cancerous tumor .
Which model is conceptual?
A. A bar graph that shows how many students buy lunch each day
B. A graph that uses analyzed data to show the spread of a disease
C. A mental image of types of food organized into a pyramid
OD. A plastic skeleton that shows all the bones of the body
SUBMIT
The model that is conceptual is a mental image of types of food organized into a pyramid (option C).
What is a conceptual model?A conceptual model is the model that is represented by concepts or related concepts formed after a conceptualization process in the mind.
A conceptual model relates to concepts or mental conception i.e. existing in the imagination.
According to this question, the model that is conceptual is the mental image of types of food organized into a pyramid.
Note that; other options are realistic and can be seen.
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Why was the need for catalyst in the origin of life important?
Answer:
Catalysts are integral in making plastics and many other manufactured items. Even the human body runs on catalysts. Many proteins in your body are actually catalysts called enzymes, which do everything from creating signals that move your limbs to helping digest your food. They are truly a fundamental part of life.
identify the independent variable and dependent variable in the scientific method
The correct answer is the independent variable is one that you manipulate, control, or vary to investigate its effects and the dependent variable that being tested and measured in an experiment .
The simplest way to determine which variable in your experiment is the Independent Variable (IV) and which is the Dependent Variable (DV) is to put both variables in the sentence below in the correct order. "A change in the DV is caused by the IV." It is impossible for DV to cause any change in IV."
Example: Independent and dependent variables You plan a study to see if changes in room temperature affect math test scores. The temperature of the room is your independent variable. You change the temperature of the room by making it cooler for half of the participants and warmer for the other half.
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How do density dependent and density independent factors differ in there effects on population growth. Give some examples of each. Please help
The difference between density dependent and density independent factors in terms of their effects on population growth and common examples are described below.
What is density dependent and independent factors?Limiting factors are conditions that limit the growth or abundance of a population of organisms in an ecosystem.
There are two types of limiting factors that can affect population growth and they are as follows:
Density dependent factorDensity independent factorDensity dependent factors are factors that regulate the population growth by mechanisms controlled by the size of the population while density independent factors affect population growth irrespective of size of the population.
Density dependent factors limit the growth of a population as the population increases while density independent factors limit the population growth irrespective of whether there is an increase in population or not.
Examples of density dependent factors are as follows:
PredationCompetitionDisease and parasitesWaste accumulationExamples of density independent factors are as follows:
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Based on the graph below, which enzyme would function the best in a humans stomach?
O Not enough information is provided to determine
O Blue
O Yellow
O Green
How can downwelling affect the ocean water
around the poles?
The marine life can survive in these extremely frigid climatic circumstances at the poles when the ocean's surface water gets a little bit warmer.
What are benefits of downwelling on poles?Downwelling is the process through which warm, light, dense water rises to the top and cold, heavy, and thick water sinks into the ocean floor. Downwelling causes oxygen-rich water to ascend to the surface where it is carried by the high density water that rises to the sea's surface, allowing marine life to breathe freely. Additionally, when the ocean's surface water gets a little warmer, marine life can survive in the polar regions' extremely harsh climates a little easier.
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How much evidence do we need to conclude that a
hypothesis is true? Should it be different for different
situations? For example, compare testing a medicine that could have bad side effects to working out which of two approved fertilizers most improve crops.
A hypothesis is an assertion or claim regarding a population's characteristics.
A method called hypothesis testing is used to examine assertions about a population's characteristics.
It is based on sample data and probability.
When performing a scientific study, there is often some existing knowledge, possibly from prior work or from an established theory. We wish to determine the plausibility of this assertion. The fundamental concept of a hypothesis test is as follows:
State what you believe to be true.
Calculate our level of assurance regarding our assertion.Make assumptions about demographic characteristics based on sample statistics.A hypothesis is a well-informed assumption that can be put to the test through observation and disproved if it turns out to be untrue, but you can't show convincingly that the vast majority of hypotheses are true because it's typically not feasible to look into every scenario.
Imagine that you get a significant breakout in the morning after eating a lot of greasy foods. You might be curious as to whether consuming greasy meals and developing acne are related. You put up the theory that pimples are brought on by eating oily food.
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Are there
more tissues or more organs in your body?
Explain your reasoning.
Answer: There are more tissues than organs.
Explanation:
There are four types of tissues: connective tissue, epithelial tissue, muscle tissue, and nervous tissue. In terms off types of organs we have 79 different ones but only 5 are considered necessary for survival. Without those five (heart, brain, kidneys, liver and lungs), you wouldn't be alive.
Organs are MADE of tissues. Therefore if there are 79 organs and each organ is made of two or more tissues, tissues will be in higher quantity.
Question 1 of 25
To maintain stable internal conditions, cells must get rid of waste. Which
statement best describes the role of the cell membrane in removing waste?
OA. Oxygen molecules move through a layer of phospholipids to exit
the cell.
OB. Active transport is used to force more sugar molecules into the
cell through protein pumps in order to clear the waste.
OC. The cell membrane surrounds waste material outside the cell,
forming a vesicle that the cell ingests.
O D. Carbon dioxide molecules pass freely through the cell membrane
to exit the cell by diffusion.
Answer:
the answer is D!!
yes it's correct
Gambling away one's retirement savings in a single night would most likely be categorized as a(n)
Multiple Choice
crime.
infraction.
accident.
deviant act.
Answer:deviant act
Explanation:because why
Carbonic anhydrase is a protein present in red blood cells. It catalyzes a reaction to convert carbon dioxide into carbonic acid and bicarbonate ions so that CO2 waste may be more easily removed from the body.
What role does this protein play in the body?
Carbon dioxide is converted to carbonic acid and bicarbonate ions with the help of the enzyme carbonic anhydrase found in red blood cells. The same enzyme aids in converting the bicarbonate ions back to carbon dioxide when red blood cells go to the lungs, where they are exhaled.
What is the action of carbonic anhydrase?In humans, the primary function of carbonic anhydrase is to catalyze the transformation of carbon dioxide into carbonic acid and back again. However, it can also aid in the blood's transportation of CO2, which benefits breathing. Even the stomach's production of hydrochloric acid can use it.
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