Question 1

Which of the following best describes the amphipathic nature of phospholipids in the plasma membrane?

Accepted Answer

They have both hydrophilic heads and hydrophobic tails.

Question 2

A patient is given an intravenous solution that is hypotonic compared to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

The cells will swell and may lyse due to water influx.

Question 3

Which of the following substances can most easily diffuse across the plasma membrane without assistance?

Accepted Answer

Oxygen ($$O_2)$$

Question 4

A cell is placed in a hypertonic solution. Which direction will water move, and what is the likely outcome for the cell?

Accepted Answer

Water will move out of the cell, causing it to crenate (shrink).

Question 5

Which organelle is primarily responsible for producing ATP through cellular respiration, and what waste product does it generate?

Accepted Answer

Mitochondria; carbon dioxide ($$CO_2)$$

Question 6

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

Accepted Answer

S phase; formation of sister chromatids

Question 7

A mutation causes a cell to lose the function of its repressor genes. What is the most likely consequence?

Accepted Answer

Uncontrolled cell division, potentially leading to cancer

Question 8

Which of the following best explains the function of the sodium-potassium pump ($$Na^+/K^+$$ pump) in the plasma membrane?

Accepted Answer

It uses ATP to move 3 sodium ions out and 2 potassium ions in, creating an electrical gradient.

Question 9

Which process describes the cell engulfing large particles, such as bacteria, by wrapping the plasma membrane around them to form a vesicle?

Accepted Answer

Phagocytosis

Question 10

A genetic disorder affects the function of ribosomes in a cell. Which cellular process will be most directly impaired?

Accepted Answer

Protein synthesis

Question 11

Which of the following best describes the role of tRNA during translation?

Accepted Answer

It brings specific amino acids to the ribosome based on the mRNA codon sequence.

Question 12

A scientist observes a cell with an extensive rough endoplasmic reticulum. What is this cell most likely specialized for?

Accepted Answer

Producing large amounts of proteins for export

Question 13

Which of the following is a function of peroxisomes in the cell?

Accepted Answer

Detoxifying reactive oxygen species and converting $$H_2O_2 to $$water and oxygen

Question 14

A cell is observed to have a large number of lysosomes. Which of the following is the most likely function of this cell?

Accepted Answer

Digesting and recycling cellular waste and foreign material

Question 15

Which of the following best describes the difference between chromatin and chromosomes?

Accepted Answer

Chromatin is loosely packed DNA, while chromosomes are condensed DNA for cell division.

Question 16

Which of the following best explains why oxygen ($$O_2) is $$required for survival at the cellular level?

Accepted Answer

It acts as the final electron acceptor in the electron transport chain, allowing ATP production.

Question 17

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

Accepted Answer

It sorts, modifies, and packages proteins and lipids for delivery.

Question 18

A stem cell that can become any type of cell within a certain lineage, such as all blood cells, is best described as:

Accepted Answer

Multipotent

Question 19

During which phase of mitosis do sister chromatids separate and move toward opposite poles of the cell?

Accepted Answer

Anaphase

Question 20

A patient has a genetic defect that prevents the formation of microtubules. Which of the following cellular processes would be most directly affected?

Accepted Answer

Formation of the mitotic spindle during cell division

The Cellular Level of Organization: Study Notes for Anatomy & Physiology

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