Q: Which equation correctly represents the movement of sodium ions by the Na$$^+/K$^+$$ pump during primary active transport?

$$3 \text{Na}^+_{cytosol} \rightarrow \text{ECF}$$ and $$2 \text{K}^+_{ECF} \rightarrow \text{cytosol}$$

Question 1

Which of the following best describes the function of the plasma membrane in a typical eukaryotic cell?

Accepted Answer

It separates the intracellular space from the extracellular space and regulates transport, communication, and cell identification.

Question 2

A patient is given a hypotonic intravenous solution after severe dehydration. What is the most likely effect on their red blood cells?

Accepted Answer

The cells will swell and may burst due to water entering the cell.

Question 3

Which organelle is primarily responsible for ATP production through aerobic respiration?

Accepted Answer

Mitochondrion

Question 4

A cell is placed in a solution with a solute concentration higher than its cytosol. Which equation best represents the osmotic pressure gradient ($$\Delta \pi) $$between the cell and the solution?

Accepted Answer

$$\Delta \pi = \pi_{ECF} - \pi_{cytosol}$$

Question 5

Which of the following membrane proteins is responsible for speeding up chemical reactions essential for cellular homeostasis?

Accepted Answer

Enzymes

Question 6

A drug designed to block the action of a ligand at its membrane receptor is classified as:

Accepted Answer

An antagonist

Question 7

Which process requires energy in the form of ATP to move solutes against their concentration gradient?

Accepted Answer

Active transport

Question 8

A cell lacking functional chloride ion channels, as seen in cystic fibrosis, will most likely experience which of the following?

Accepted Answer

Production of thick, sticky mucus in the lungs

Question 9

Which cytoskeletal element is most directly involved in the movement of chromosomes during cell division?

Accepted Answer

Microtubules

Question 10

Which of the following best explains why the plasma membrane is described as a 'fluid mosaic'?

Accepted Answer

Its components, including lipids and proteins, move freely within the bilayer, allowing dynamic changes.

Question 11

Which organelle is responsible for modifying, packaging, and distributing proteins and lipids produced by the endoplasmic reticulum?

Accepted Answer

Golgi apparatus

Question 12

A cell is exposed to a hypertonic extracellular fluid (ECF). What is the expected net movement of water?

Accepted Answer

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

Question 13

Which of the following is NOT a function of membrane proteins?

Accepted Answer

Storing genetic information

Question 14

Which process involves the ingestion of large particles, such as bacteria, by a cell?

Accepted Answer

Phagocytosis

Question 15

Which equation correctly represents the movement of sodium ions by the Na$$^+/K$^+$$ pump during primary active transport?

Accepted Answer

$$3 	ext{Na}^+_{cytosol} ightarrow 	ext{ECF}$$ and $$2 	ext{K}^+_{ECF} ightarrow 	ext{cytosol}$$

Question 16

Which cytoskeletal structure increases the surface area of cells in organs specialized for absorption?

Accepted Answer

Microvilli

Question 17

Which organelle contains powerful degradative enzymes and is responsible for the digestion of worn-out cellular components?

Accepted Answer

Lysosome

Question 18

Which of the following best describes the role of peroxisomes in the cell?

Accepted Answer

They break down fatty acids and detoxify harmful substances using oxygen.

Question 19

Which structure within the nucleus is responsible for the synthesis of ribosomal RNA and assembly of ribosomal subunits?

Accepted Answer

Nucleolus

Question 20

A genetic disorder affects the protein components of cilia and flagella. Which of the following symptoms is most likely to occur?

Accepted Answer

Buildup of mucus in the lungs and increased risk of respiratory infections

Cellular Level of Organization: Structure and Function of Cells

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