Practice Questions

TLS Online TPP Program

#Question id: 10132

Which of the following statements would be correct for photophosphorylation ?

#Unit 6. System Physiology – Plant

Water is oxidized and protons are released in the lumen by PSII and reduces NADP+ to NADPH in the stroma both are spontaneous processes becoz their reduction potential is positive
The sequential absorption of four photons (excitons) —known as S states, each absorption causing the loss of one electron from the Mn4Ca cluster, produces an oxidizing agent that can remove four electrons from two molecules of water, producing O2, the electrons lost from the Mn4Ca cluster pass one at a time to an oxidized Tyr residue in a PSII protein, then to P680+
An alternative path of electron is cyclic electron transfer, in which elctron move from ferredoxin back to the cytochrome b6 f complex, the cyclic pathway produces more ATP and Water produces but less NADPH produces than the noncyclic
Transfer of the two electrons to PQB reduces it to PQB 2–, and the reduced PQB 2– takes two protons from the stroma side of the medium, yielding a fully reduced plastohydroquinone (PQH2), the PQH2 then still remain bounded from the reaction center complex

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TLS Online TPP Program

#Question id: 20272

#Unit 7. System Physiology – Animal

The factors that stimulate or inhibit the secretion of ADH by the posterior pituitary are:

a. Pain, nausea, hypoglycemia, and various drugs all inhibit the secretion of ADH.

b. Pain, nausea, hypoglycemia, and various drugs all stimulate the secretion of ADH.

c. Ethanol, α-adrenergic agonists, and atrial natriuretic peptide inhibit secretion of ADH.

d. Nicotine, opiates, antineoplastic agents stimulate the secretion of ADH.

Which one of the following combinations of above statements is correct?

TLS Online TPP Program

#Question id: 20273

#Unit 7. System Physiology – Animal

Primary site of action of thiazide diuretics in the nephron is;

TLS Online TPP Program

#Question id: 20274

#Unit 7. System Physiology – Animal

ADH has two actions, one on the kidney and the other on vascular smooth muscle, these actions are mediated by different receptors, different intracellular mechanisms, and different secondary messengers.

a. The major action of ADH is to increase the water permeability of principal cells in the late distal tubule and collecting duct.

b. The receptor for ADH on the principal cells is a V2 receptor, which is coupled to adenylyl cyclase via a Gs protein.

c. The second messenger is cAMP, via phosphorylation steps, directs the insertion of water channels, aquaporin 2 (AQP2), in luminal membranes.

d. The receptor for ADH on the principal cells is a V1 receptor, which is coupled to phospholipase C via Gq protein.

Which one of the following combination of above statements is correct?

TLS Online TPP Program

#Question id: 20275

#Unit 7. System Physiology – Animal

Vasopressin has two actions, one on the kidney and the other on vascular smooth muscle, Contraction of vascular smooth muscle are mediated by different receptors, different intracellular mechanisms, and different second messengers,

a. The receptor for ADH on vascular smooth muscle is a V1 receptor

b. The receptor for ADH on the vascular smooth muscle is a V2 receptor

c. The second messenger for this action is IP3/Ca2+

d. The second messenger is cAMP.

Which of the above is/are correct?

TLS Online TPP Program

#Question id: 20276

#Unit 7. System Physiology – Animal

Central diabetes insipidus is caused by failure of the posterior pituitary to secrete ADH and the following statements pertain to that disorder:

A. excretion of large volumes of dilute urine

B. the urine cannot be concentrated

C. produces large volumes of dilute urine

D. increased serum osmolarity

E. circulating levels of ADH are high

Which of the following is the correct combination of the statements given above?

TLS Online TPP Program

#Question id: 20277

#Unit 7. System Physiology – Animal

Which is structurally similar to growth hormone?

d. Bromocriptine

Which of the above is/are correct?