Question 1

Which of the following best explains why mitochondria and chloroplasts are considered semiautonomous organelles?

Accepted Answer

They contain their own DNA and can reproduce within the cell, but still rely on nuclear genes for some functions.

Question 2

A mutation disrupts the microtubule organizing center (MTOC) in a cell. Which process would be most directly affected?

Accepted Answer

Movement of mitochondria along cytoskeletal tracks.

Question 3

Which equation correctly represents the overall process of photosynthesis in chloroplasts?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 4

Which of the following is a direct consequence of the endosymbiont theory for mitochondria and chloroplasts?

Accepted Answer

Both organelles contain double membranes and circular DNA.

Question 5

A patient is diagnosed with progeria, a disease affecting nuclear envelope structure. Which cellular process is most likely to be impaired?

Accepted Answer

Proper segregation of chromosomes during cell division.

Question 6

Which cytoskeletal element is primarily responsible for maintaining the shape of the plasma membrane and enabling cell movement?

Accepted Answer

Actin filaments (microfilaments)

Question 7

Motor proteins such as kinesin and dynein move along which cytoskeletal structure to transport vesicles and organelles?

Accepted Answer

Microtubules

Question 8

Which of the following statements about the location of mitochondria in a cell is correct?

Accepted Answer

Mitochondria move throughout the cytoplasm using cytoskeletal tracks.

Question 9

Which of the following best describes the function of the cristae in mitochondria?

Accepted Answer

They increase the surface area for enzymes involved in oxidative phosphorylation.

Question 10

A cell is observed to have defective flagella. Which cellular function is most likely to be impaired?

Accepted Answer

Motility

Question 11

Which of the following junctions is responsible for direct cytoplasmic exchange between adjacent plant cells?

Accepted Answer

Plasmodesmata

Question 12

Which organelle is specialized for breaking down hydrogen peroxide ($$H_2O_2) in $$animal cells?

Accepted Answer

Peroxisome

Question 13

Which of the following is NOT a function of the extracellular matrix (ECM) in animal cells?

Accepted Answer

Synthesizing ATP for cellular energy

Question 14

Which cytoskeletal element is most directly involved in the formation of pseudopodia for amoeboid movement?

Accepted Answer

Actin filaments

Question 15

A scientist isolates a polymer composed of repeating tubulin dimers. Which cellular structure is this polymer most likely to form?

Accepted Answer

Microtubules

Question 16

Which of the following best describes the role of centrioles in animal cells?

Accepted Answer

They organize microtubules during cell division.

Question 17

Which of the following statements about the endomembrane system is correct?

Accepted Answer

It includes the endoplasmic reticulum, Golgi apparatus, and lysosomes, but not mitochondria or chloroplasts.

Question 18

Which of the following is a key difference between mitochondria and chloroplasts?

Accepted Answer

Mitochondria are found in all eukaryotic cells, while chloroplasts are only found in plants and algae.

Question 19

Which process is most directly affected if a cell's actin filaments are disrupted?

Accepted Answer

Cell shape and movement

Question 20

Which of the following best explains why mitochondria are present in all eukaryotic cells?

Accepted Answer

They generate most of the cell's ATP through cellular respiration.

Cytoskeleton, Mitochondria, Chloroplasts, Extracellular Matrix, and Peroxisomes: Structure and Function in Eukaryotic Cells

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