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 thephospholipid bilayer?

Select one:

a. is the source of ATP synthesis.

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

c. is the site of transcription andtranslation.

d. contains the genetic information required forcellular processes.

e. the formation of a barrier that is selectivelypermeable to lipid-soluble molecules and to provide a framework formembrane proteins. 

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

Question 3

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3. If a 25% sucrose solution is separated from a15% sucrose solution by a membrane impermeable to sucrose, butpermeable to water, in which direction will net movement of wateroccur?

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 thiscase.

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 solutionto the 25% sucrose solution only.

Question 4

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4. A neuron is exposed to a drug that causes theblockage of Na⁺ leak channels. How will thisdrug affect the resting membrane potential of theneuron? 
W. The resting membrane potential in this neuron would initiallybecome more positive.
X. The resting membrane potential in this neuron would becomearound +60 mV.
Y. The resting membrane potential would return to normal followingactivity of the sodium-potassium pump.
Z. The resting membrane potential in this neuron would become morenegative.

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 thyroidhormones thyroxine (T4) and tri-iodothyronine (T3) wouldcause 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 arecorrect

Question 7

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7. What is the primary mechanism for maintaininghomeostasis?

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 followingoccurs 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 willyou help mi to explain all opetion ex w.x .y z from all question inshort answer explanations