Question 1

Which of the following best explains why neurons in the brain have a highly branched structure, as shown in the first image?

Accepted Answer

To maximize the surface area for receiving and transmitting signals to other cells.

Question 2

Which organelle is responsible for the synthesis of ATP through cellular respiration in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 3

Based on the second image, which structure within the chloroplast is the primary site of the light-dependent reactions of photosynthesis?

Accepted Answer

Thylakoid

Question 4

Which of the following statements about plasmodesmata, as shown in the third image, is correct?

Accepted Answer

They allow the movement of water, small solutes, and sometimes proteins and RNA between plant cells.

Question 5

Which of the following cell types is specialized for contraction and movement in the human body?

Accepted Answer

Smooth muscle cell

Question 6

Which feature is shared by both mitochondria and chloroplasts, supporting the endosymbiont theory?

Accepted Answer

Both contain circular DNA and free ribosomes.

Question 7

A scientist wants to study the internal structure of mitochondria at very high resolution. Which microscopy technique should they use?

Accepted Answer

Transmission electron microscopy (TEM)

Question 8

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

Accepted Answer

It modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Question 9

Why do plant cells have a large central vacuole, and what is its main function?

Accepted Answer

To store inorganic ions and contribute to cell growth by absorbing water.

Question 10

Which of the following is a function of peroxisomes in eukaryotic cells?

Accepted Answer

Breaking down fatty acids and detoxifying harmful substances.

Question 11

A mutation disrupts the function of dynein in a cell. Which cellular process would be most directly affected?

Accepted Answer

Movement of cilia and flagella

Question 12

Which of the following best explains why cells are generally small in size?

Accepted Answer

A high surface area to volume ratio allows efficient exchange of materials with the environment.

Question 13

Which of the following is NOT a component of the endomembrane system?

Accepted Answer

Mitochondrion

Question 14

Which cytoskeletal element is primarily responsible for the separation of chromosomes during cell division?

Accepted Answer

Microtubules

Question 15

Which type of cell junction in animal cells prevents the leakage of extracellular fluid between neighboring cells?

Accepted Answer

Tight junction

Question 16

A plant cell is placed in a hypotonic solution. Which structure prevents the cell from bursting?

Accepted Answer

Cell wall

Question 17

Which of the following best describes the role of the extracellular matrix (ECM) in animal cells?

Accepted Answer

It provides structural support and mediates communication between cells.

Question 18

Which of the following statements about ribosomes is correct?

Accepted Answer

They are composed of ribosomal RNA and protein and are the site of protein synthesis.

Question 19

Which of the following is a unique feature of prokaryotic cells compared to eukaryotic cells?

Accepted Answer

DNA is located in an unbound region called the nucleoid.

Question 20

Which process describes the engulfment of a bacterium by a white blood cell, followed by its digestion?

Accepted Answer

Phagocytosis followed by lysosomal digestion

A Tour of the Cell: Structure, Function, and Diversity

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