The vitamin that is required for the synthesis of clotting factors is: MCQ with Answer and Explanation

The vitamin that is required for the synthesis of clotting factors is:
A. Vitamin A
B. Vitamin K
C. Vitamin E
D. Vitamin C
Answer: Option B
Solution (By JKExamLibrary)
Vitamin K is a cofactor for the enzyme γ-glutamyl carboxylase, which adds carboxyl groups to glutamic acid residues in clotting factors II, VII, IX, and X, allowing them to bind calcium and participate in coagulation. Deficiency leads to bleeding tendency.

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Practice More Biology Questions

Question #1
The hormone that stimulates the secretion of gastric acid is:
A. Secretin
B. GIP
C. CCK
D. Gastrin

Correct Answer: Option D


Explanation:
Gastrin, released by G cells in the stomach antrum, stimulates parietal cells to secrete HCl. Secretin stimulates bicarbonate, CCK stimulates enzyme secretion and gallbladder contraction, GIP inhibits gastric secretion.

This question belongs to: Science Biology
Question #2
The glomerular filtration rate (GFR) in a healthy adult is approximately:
A. 250 mL/min
B. 50 mL/min
C. 125 mL/min
D. 500 mL/min

Correct Answer: Option C


Explanation:
Glomerular filtration rate (GFR) is the volume of filtrate formed per minute by both kidneys, normally about 125 mL/min (180 L/day). Nearly 99% of the filtrate is reabsorbed, leaving about 1-2 liters of urine per day. GFR is regulated by the juxtaglomerular apparatus. It's an important clinical indicator of kidney function, estimated from serum creatinine.

This question belongs to: Science Biology
Question #3
In which part of the human body is the pituitary gland located?
A. Brain (hypothalamus region)
B. Neck
C. Pelvis
D. Abdomen

Correct Answer: Option A


Explanation:
The pituitary gland is a pea-sized endocrine gland located at the base of the brain, in a bony cavity called sella turcica, attached to the hypothalamus by a stalk (infundibulum). It is divided into anterior and posterior pituitary, secreting hormones that regulate growth, reproduction, metabolism, and other endocrine glands. Thus, it's in the head, not neck or abdomen.

This question belongs to: Science Biology