Practice Questions

TLS Online TPP Program

#Question id: 3301

Following statement is correct regarding convergent evolution.

#Unit 11. Evolution and Behavior

Spreading of species to different and isolated environments which blocks the gene flow among the distinct populations
Flipper of whale and Fin of fish is one example of convergent evolution
Environmental induced force allowed to homologous organ being modified to new function
Sympatric speciation leads to divergence of one species in to two are more descendant species

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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