Practice Questions

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#Question id: 801

Identify the type of DNA from the structures given below and match the correct form with its characteristics described.

#Unit 1. Molecules and their Interaction Relevant to Biology

(ii) – The more compact A form of DNA has 11 bp per turn and shows a large tilt of the base pairs with respect to the helix axis.
(i) – The B form, which is observed at high humidity, most closely corresponds to the average structure of DNA under physiological conditions.
(iii) – Z DNA is a left-handed helix and has a zigzag (hence “Z”) appearance and has an anti-conformation of glycosyl bond.
(i) – The A form which is observed under low humidity has a structure similar to the structure that RNA adopts when double-helical.

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#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.

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#Question id: 34142

#Unit 7. System Physiology – Animal

Somatostatin inhibits the secretion of following hormones, EXCEPT?

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#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

TLS Online TPP Program

#Question id: 34145

#Unit 7. System Physiology – Animal

I. The short arm of human chromosome 17 contains the growth hormone-hCS cluster.

II. Growth hormone increases circulating IGF-I, which in turn exerts a direct inhibitory action on growth hormone secretion from the pituitary.

III. Growth hormone secretion is decreased in persons deprived of rapid eye movement (REM) sleep.

IV. Growth hormone secretion is induced by thyroid hormones & inhibited, by cortisol.