Question 1

Which organelle is primarily responsible for modifying, sorting, and packaging hydrolase enzymes before they are delivered to lysosomes?

Accepted Answer

Golgi apparatus

Question 2

A macrophage engulfs a pathogenic bacterium. Which process is directly responsible for this action, and what is the fate of the bacterium inside the cell?

Accepted Answer

Phagocytosis; the bacterium is digested by lysosomal enzymes

Question 3

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

Accepted Answer

They contain their own circular DNA and ribosomes, allowing them to produce some of their own proteins

Question 4

A patient is exposed to a toxic compound that is broken down in the liver. Which organelle is most directly involved in detoxifying this compound?

Accepted Answer

Peroxisome

Question 5

Which of the following is a function of the cristae in mitochondria?

Accepted Answer

Increasing the surface area for enzymes involved in ATP synthesis

Question 6

During muscle contraction, which cytoskeletal elements interact to produce movement?

Accepted Answer

Actin filaments and myosin motor proteins

Question 7

Which of the following best describes the main function of intermediate filaments in animal cells?

Accepted Answer

Providing structural support and maintaining cell shape

Question 8

A plant cell is observed to have a high number of thylakoids. What is the primary function of these structures?

Accepted Answer

Capturing light energy for photosynthesis

Question 9

Which of the following equations correctly represents the overall process of cellular respiration that occurs in mitochondria?

Accepted Answer

$$6 \, \mathrm{O}_2 + \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 ightarrow 6 \, \mathrm{CO}_2 + 6 \, \mathrm{H}_2\mathrm{O} + 	ext{energy (ATP)}$$

Question 10

Which of the following is NOT a function of the cytoskeleton?

Accepted Answer

Synthesizing DNA

Question 11

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

Accepted Answer

Chromosome movement during cell division

Question 12

Which of the following organelles is found in plant cells but not in animal cells?

Accepted Answer

Chloroplast

Question 13

Which cytoskeletal element is primarily responsible for resisting compression and forming tracks for intracellular transport?

Accepted Answer

Microtubules

Question 14

A scientist observes a eukaryotic cell with an extensive network of cristae. What can be inferred about the cell's metabolic activity?

Accepted Answer

It has a high demand for ATP and is likely very metabolically active

Question 15

Which of the following best describes the endosymbiotic theory for the origin of mitochondria and chloroplasts?

Accepted Answer

They originated from prokaryotic cells engulfed by an ancestral eukaryotic cell

Question 16

Which of the following processes is unique to plant cells and involves the movement of cytoplasm to distribute nutrients and organelles?

Accepted Answer

Cytoplasmic streaming

Question 17

A cell is observed to have a large number of peroxisomes. Which metabolic process is likely to be especially active in this cell?

Accepted Answer

Breakdown of fatty acids and detoxification of harmful substances

Question 18

Which of the following best explains why most proteins found in mitochondria and chloroplasts are encoded by nuclear DNA?

Accepted Answer

The organelle genomes are small and only encode a few essential proteins

Question 19

Which of the following is a correct pairing of a cytoskeletal element with its function?

Accepted Answer

Microfilaments: muscle contraction

Question 20

A mutation in a plant cell prevents the formation of grana. Which process would be most directly impaired?

Accepted Answer

Light-dependent reactions of photosynthesis

Eukaryotic Cell Organelles and the Cytoskeleton

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