ADAT ADAT Biomedical Sciences 3

Question 1

Which organelle is primarily responsible for the post-translational modification and packaging of proteins?

Accepted Answer

Golgi apparatus

Answer

Rough endoplasmic reticulum

Answer

Lysosome

Answer

Peroxisome

Question 2

A resting neuron maintains a negative membrane potential primarily due to which mechanism?

Accepted Answer

Na+/K+ ATPase pump activity

Answer

Passive chloride influx

Answer

Calcium sequestration

Answer

Glucose transport

Question 3

Which of the following bacteria is a primary etiologic agent in the initiation of dental caries?

Accepted Answer

Streptococcus mutans

Answer

Escherichia coli

Answer

Staphylococcus aureus

Answer

Lactobacillus casei

Question 4

Which vitamin is essential for the hydroxylation of proline and lysine in collagen synthesis?

Accepted Answer

Vitamin C

Answer

Vitamin A

Answer

Vitamin D

Answer

Vitamin K

Question 5

Which region of the nephron is the primary site of glucose and amino acid reabsorption?

Accepted Answer

Proximal convoluted tubule

Answer

Loop of Henle

Answer

Distal convoluted tubule

Answer

Collecting duct

Question 6

MHC class I molecules present antigens primarily to which type of T cell?

Accepted Answer

CD8+ cytotoxic T cells

Answer

CD4+ helper T cells

Answer

Regulatory T cells

Answer

Natural killer cells

Question 7

Which muscle of mastication is primarily responsible for protrusion of the mandible?

Accepted Answer

Lateral pterygoid

Answer

Masseter

Answer

Temporalis

Answer

Medial pterygoid