Question

11. Repeated exposure to hot environments when combined with exercise improves exercise capacity, with less discomfort upon subsequent heat exposure. One thing that changes is that a person begins sweating sooner and they sweat more (nearly double). Sweating sooner represents what type of change?

a) decreased threshold

b) increased threshold

c) decreased set point.

d) increased set point

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12.Which statement(s) about control strategies is/are incorrect? Choose any that apply.

a) An advantage of a feedforward system is that it allows the body to anticipate a change, or prepare for something to happen.

b) A disadvantage of a feedforward system is it doesn’t allow you to respond to an unexpected change.

c) An advantage of a positive feedback system is allows for rapid changes to a regulated variable.

d) A disadvantage of a positive feedback system is that it is not homeostatic. e) A disadvantage of a negative feedback system is it requires some outside event to stop the response.

f) All of the above are correct.

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13. Which of the following compounds is a carbohydrate? Choose any that apply. a) C5H10O5 b) C6H12O6NS c) C3H6O314. 14. Water is polar; organic solvents (for ex., gasoline, ether, carbon tetrachloride and benzene) are nonpolar. A substance is found to dissolve in organic solvents but not in the water. Is this substance most likely polar or nonpolar, or both?

a) both

b) nonpolar

c) polar

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15. An 18-year-old girl presents with a lack of secondary sexual characteristics, such as age-appropriate pubic hair growth and breast development. Her history reveals she has never started menses. She is diagnosed with a deficiency. The levels of various steroid hormones in her serum are found to be abnormal. Which of the following is she most likely lacking or does she most likely have very low levels of?

a) acetyl CoA

b) cholesterol

c) fatty acids

d) glucose

e) oleic acid

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18. There is an amino acid transporter that only transports acidic amino acids, another that transports basic amino acids, and a third that transports neutral amino acids. This is an example of which protein characteristic?

a) affinity

b) saturation

c) specificity

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20. Many people die each year from ingesting antifreeze solutions. Antifreeze contains ethylene glycol, which the human body converts to oxalic acid in the presence of the enzyme alcohol dehydrogenase. Oxalic acid exists in crystalline form and these crystals can severely damage kidneys. Ethanol is administered to victims with ethylene glycol poisoning because ethanol binds to the active site of alcohol dehydrogenase, inhibiting the formation of oxalate crystals. How would you classify ethanol in this scenario?

a) allometric inhibitor of ethylene glycol

b) allosteric inhibitor of ethylene glycol

c) cofactor of ethylene glycol

d) competitive inhibitor of ethylene glycol

e) covalent inhibitor of ethylene glycol

Answer 1

11. Repeated exposure to hot environments when combined with exercise improves exercise capacity, with less discomfort upon subsequent heat exposure. One thing that changes is that a person begins sweating sooner and they sweat more (nearly double). Sweating sooner represents what type of change?

(A)Decreased threshold

12. Which statement(s) about control strategies is/are incorrect? Choose any that apply.

a) An advantage of a feedforward system is that it allows the body to anticipate a change, or prepare for something to happen.

c) An advantage of a positive feedback system is allows for rapid changes to a regulated variable.

e) A disadvantage of a negative feedback system is it requires some outside event to stop the response.

Feedforward system does not allow to correct the errors rather continuing with the same error. Positive feedback which exacerbates the effects of a small disturbance. It does not allow to maintain homeostasis. The perturbation on a system found to increase with the positive feed back whereas, the negative feedback acts to maintain homeostasis.

13. Which of the following compounds is a carbohydrate? Choose any that apply.

a) C5H10O5 c) C3H6O3

The general formula for a carbohydrate is (CH₂O)_x

14. Water is polar; organic solvents (for ex., gasoline, ether, carbon tetrachloride and benzene) are nonpolar. A substance is found to dissolve in organic solvents but not in the water. Is this substance most likely polar or nonpolar, or both?

b) nonpolar

Non polar substances are organic substances that can dissolve in organic solvents but not in water because they are hydrophobic and repelled by water.