Question 1

Which of the following best describes the role of the mitochondria in a eukaryotic cell?

Accepted Answer

It produces most of the cell’s ATP through aerobic respiration.

Question 2

During which phase of the cell cycle does DNA replication occur, and what is the significance of this process?

Accepted Answer

DNA replication occurs during the S phase, providing identical genetic material for daughter cells.

Question 3

A patient is experiencing muscle weakness due to a lack of ATP. Which organelle is most likely malfunctioning, and why?

Accepted Answer

The mitochondrion, because it is the site of aerobic ATP production.

Question 4

Which of the following best illustrates a negative feedback mechanism in human physiology?

Accepted Answer

Sweating increases as body temperature rises, cooling the body back to normal.

Question 5

Which cytoskeletal element is primarily responsible for resisting pulling forces within the cell?

Accepted Answer

Intermediate filaments

Question 6

A mutation prevents the formation of Schwann cells. Which of the following would most likely result?

Accepted Answer

Impaired myelination of peripheral nerves

Question 7

Which of the following best describes the function of astrocytes in the central nervous system?

Accepted Answer

They support neurons, regulate the extracellular environment, and help form the blood-brain barrier.

Question 8

A patient has a genetic defect that prevents the production of actin. Which cellular process would be most directly affected?

Accepted Answer

Muscle contraction

Question 9

Which of the following is a correct sequence of events during mitosis?

Accepted Answer

Prophase → Metaphase → Anaphase → Telophase

Question 10

Which of the following best explains why the optic disc is referred to as the 'blind spot'?

Accepted Answer

It is where the optic nerve exits the eye and lacks photoreceptors.

Question 11

Which of the following best describes the function of the sarcoplasmic reticulum in skeletal muscle fibers?

Accepted Answer

It stores and releases calcium ions necessary for muscle contraction.

Question 12

A patient is unable to produce sufficient bile. Which organ is most likely malfunctioning, and what is a likely consequence?

Accepted Answer

Liver; impaired fat emulsification and absorption

Question 13

Which of the following is a function of the lymphatic system?

Accepted Answer

Returning leaked fluid from tissues to the blood

Question 14

Which of the following best describes the role of creatine phosphate in muscle contraction?

Accepted Answer

It donates a phosphate group to ADP to rapidly regenerate ATP.

Question 15

Which of the following is a correct description of the function of microglial cells in the CNS?

Accepted Answer

They act as immune cells, phagocytizing microorganisms and neuronal debris.

Question 16

A patient presents with dehydration and an inability to regulate water balance. Which organ system is most likely affected?

Accepted Answer

Urinary system

Question 17

Which of the following best describes the function of the dermis in the skin?

Accepted Answer

It contains connective tissue, blood vessels, and sensory receptors.

Question 18

Which of the following is a function of the respiratory system?

Accepted Answer

Exchange of oxygen and carbon dioxide between the body and environment

Question 19

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

It modifies, sorts, and packages proteins for secretion.

Question 20

A patient has a mutation that prevents the formation of tight junctions between epithelial cells. Which of the following is a likely consequence?

Accepted Answer

Increased permeability of epithelial barriers, allowing substances to leak between cells

Comprehensive Study Guide for Anatomy & Physiology: Cell Biology, Tissues, Systems, and Special Senses

Study Guide - Practice Questions