Biochemistry Past Paper MCQs | Batch 48 First Online Test 1st Year | mosaicbro.com
Biochemistry Past Paper MCQs | Batch 48 First Online Test 1st Year
This is series of Past Paper MCQs series of Biochemistry.
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15
Which of the following contain only single apo protein?
Correct Answer:A
Explanation:
LDL contains a single apolipoprotein, apoB-100, which mediates binding to LDL receptors. Other lipoproteins like HDL or chylomicrons have multiple apoproteins (e.g., apoA-I, apoB-48).
16
Which of the following statements is NOT correct about the phospholipid molecules in the plasma membrane?
Correct Answer:A
Explanation:
Phospholipids have two nonpolar fatty acid tails (not four) and one polar head group. The tails are hydrophobic, while the head is hydrophilic, forming the bilayer structure with heads facing aqueous environments.
17
Which of the following is a keto triose?
Correct Answer:A
Explanation:
Dihydroxyacetone is a keto triose (3-carbon ketone sugar). Glyceraldehyde is an aldo triose, while ribulose is a keto pentose. Trioses are the simplest sugars with three carbons.
18
Dietary fats are transported as?
Correct Answer:A
Explanation:
Dietary fats are packaged into chylomicrons in intestinal enterocytes. These lipoprotein particles transport triglycerides to peripheral tissues via the lymphatic system and bloodstream.
19
Buffer is mixture of?
Correct Answer:A
Explanation:
Buffers consist of a weak acid and its conjugate base (e.g., acetic acid/acetate) or a weak base and its conjugate acid. They resist pH changes by neutralizing added H+ or OH- ions.
20
The protein synthesis in mitochondria is due to
Correct Answer:A
Explanation:
Mitochondria have their own DNA, ribosomes (55S type), and RNA to synthesize a subset of proteins (e.g., respiratory chain subunits). Most mitochondrial proteins, however, are nuclear-encoded and imported.
21
Which of the following vitamin is used as anti aging?
Correct Answer:B
Explanation:
Vitamin E (α-tocopherol) is a potent antioxidant that protects cell membranes from lipid peroxidation caused by free radicals. This property underlies its use in anti-aging skincare and supplements.