Question

 A chain of many simple sugars is a:

Select one:

a. monosaccharide.

b. polysaccharide.

c. disaccharide.

d. nucleic acid. 

e. fatty acid.

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The correct answer is: polysaccharide.

Question 2

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2. What is/are the major role(s) of the phospholipid bilayer?

Select one:

a. is the source of ATP synthesis.

b. the formation of a barrier that is selectively permeable to lipid-soluble molecules only.

c. is the site of transcription and translation.

d. contains the genetic information required for cellular processes.

e. the formation of a barrier that is selectively permeable to lipid-soluble molecules and to provide a framework for membrane proteins. 

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The correct answer is: the formation of a barrier that is selectively permeable to lipid-soluble molecules and to provide a framework for membrane proteins. 

Question 3

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3. If a 25% sucrose solution is separated from a 15% sucrose solution by a membrane impermeable to sucrose, but permeable to water, in which direction will net movement of water occur?

Select one:

a. From the 15% sucrose solution to the 25% sucrose solution only.

b. From the 25% sucrose solution to the 15% sucrose solution only.

c. There will be no net movement of water in this case.

d. From the 15% sucrose solution to the 25% sucrose solution and from the 25% sucrose solution to the 15% sucrose solution.

e. None of the answers are correct.

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The correct answer is: From the 15% sucrose solution to the 25% sucrose solution only.

Question 4

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4. A neuron is exposed to a drug that causes the blockage of Na⁺ leak channels. How will this drug affect the resting membrane potential of the neuron? 
W. The resting membrane potential in this neuron would initially become more positive.
X. The resting membrane potential in this neuron would become around +60 mV.
Y. The resting membrane potential would return to normal following activity of the sodium-potassium pump.
Z. The resting membrane potential in this neuron would become more negative.

Select one:

a. if only W, X and Y are correct

b. if only W and Y are correct

c. if only X and Z are correct

d. if only Z is correct

e. if all are correct

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The correct answer is: if only Z is correct

Question 5

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5. Graded potentials may:
W. initiate an action potential.
X. depolarize the membrane to the threshold voltage.
Y. hyperpolarize the membrane.
Z. be called EPSPs or IPSPs.

Select one:

a.
 if only W, X and Y are correct

b. if only W and Y are correct

c. if only X and Z are correct

d. if only Z is correct

e. if all are correct

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The correct answer is: if all are correct

Question 6

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6. A higher than normal secretion of the thyroid hormones thyroxine (T4) and tri-iodothyronine (T3) would cause increases in:
W. basal metabolic rate.
X. thyrotropin releasing hormone (TRH).
Y. basal rate of heat production.
Z. thyroid stimulating hormone (TSH).

Select one:

a. if only W, X and Y are correct

b. if only W and Y are correct

c. if only X and Z are correct

d. if only Z is correct

e. if all are correct

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The correct answer is: if only W and Y are correct

Question 7

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7. What is the primary mechanism for maintaining homeostasis?

Select one:

a. positive feedback

b. negative feedback

c. intrinsic control

d. extrinsic control

e. homeostatic control

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The correct answer is: negative feedback

Question 8

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8. Based on a 28-day cycle, which of the following occurs during days 6-14 of the menstrual cycle? 

Select one:

a. ovulation

b. menstruation

c. proliferative phase

d. secretory phase

e. luteal phase

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The correct answer is: proliferative phase will you help mi to explain all opetion ex w.x .y z from all question in short answer explanations

Answer 1