Practice Questions

TLS Online TPP Program

#Question id: 11990

Imagine that you are designing an experiment aimed at determining whether the initiation of migratory behavior is largely under genetic control. Of the following options, the best way to proceed is to

#Unit 10. Ecological Principles

Observe genetically distinct populations in the field and see if they have different migratory habits.
Perform within- population matings with birds from different populations that have different migratory habits. Do this in the laboratory and see if offspring display parental migratory behavior.
Bring animals into the laboratory and determine the conditions under which they become restless and attempt to migrate
Perform within- population matings with birds from different populations that have different migratory habits.

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TLS Online TPP Program

#Question id: 34139

#Unit 7. System Physiology – Animal

I. Oxytocin and vasopressin are typical neural hormones , that is, hormones secreted into the circulation by nerve cells.

II. Vasopressin and oxytocin each have a characteristic neurophysin associated with them in the granules in the neurons.

III. The precursor for AVP, prepropressophysin , contains a 19-amino-acid residue leader sequence followed by AVP, neurophysin II, and a glycopeptide.

IV. Prepro-oxyphysin, the precursor for oxytocin, is a similar but smaller molecule that lacks the glycopeptide.

TLS Online TPP Program

#Question id: 34140

#Unit 7. System Physiology – Animal

Following stimulus stimulates vasopressin-secreting neurons, EXCEPT?

TLS Online TPP Program

#Question id: 34141

#Unit 7. System Physiology – Animal

I. Oxytocin causes contraction of the smooth muscle of the uterus.

II. The suckling of an infant at the breast stimulates the touch receptors, the nuclei are stimulated, oxytocin is released.

III. The sensitivity of the uterine musculature to oxytocin is enhanced by estrogen.

IV. Progesterone directly stimulates myometrial contraction while simultaneously reducing oxytocin clearance.

TLS Online TPP Program

#Question id: 34142

#Unit 7. System Physiology – Animal

Somatostatin inhibits the secretion of following hormones, EXCEPT?

TLS Online TPP Program

#Question id: 34143

#Unit 7. System Physiology – Animal

Which of the following best explains how normal plasma oxytocin levels at the onset of labor can still result in powerful uterine contractions?

TLS Online TPP Program

#Question id: 34144

#Unit 7. System Physiology – Animal

Select A if the item is associated with (a), B if the item is associated with (b), C if the item is associated with both (a) and (b), and D if the item is associated with neither (a) nor (b).

(a) V1A vasopressin receptors

(b) V2 vasopressin receptors

I. Activation of Gs

II. Vasoconstriction

III. Increase in intracellular IP3

IV. Movement of aquaporin

V. Milk ejection