Question 1

Which organelle is primarily responsible for digesting macromolecules and recycling cellular components through processes such as autophagy and phagocytosis?

Accepted Answer

Lysosome

Question 2

A genetic disorder such as Tay Sachs disease is caused by the malfunction of which organelle, leading to the accumulation of undigested lipids in nerve cells?

Accepted Answer

Lysosome

Question 3

During embryonic development, the loss of webbing between fingers is an example of which cellular process?

Accepted Answer

Apoptosis

Question 4

Which equation best represents the conversion of hydrogen peroxide to water in peroxisomes?

Accepted Answer

$$2H_2O_2 \rightarrow 2H_2O + O_2$

Question 5

Which structure in plant cells is responsible for maintaining cell shape, storing nutrients, and regulating water balance?

Accepted Answer

Central vacuole

Question 6

According to the endosymbiont theory, which evidence supports the idea that mitochondria originated from prokaryotic cells?

Accepted Answer

Mitochondria contain circular DNA and their own ribosomes

Question 7

If most mitochondria in a zygote come from the egg cell, how can mitochondrial DNA be used in tracing human lineage?

Accepted Answer

It can trace maternal ancestry

Question 8

Which cytoskeletal element is primarily responsible for the movement of cilia and flagella?

Accepted Answer

Microtubules

Question 9

A macrophage engulfs a bacterium through which process, and which organelle is then responsible for digesting the bacterium?

Accepted Answer

Phagocytosis; lysosome

Question 10

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

Accepted Answer

It provides structural support and regulates cell behavior

Question 11

Which cell junction allows direct cytoplasmic exchange of ions and small molecules between adjacent plant cells?

Accepted Answer

Plasmodesmata

Question 12

Which cytoskeletal component is most important for maintaining cell shape and resisting tension?

Accepted Answer

Intermediate filaments

Question 13

A plant cell is placed in a hypotonic solution. Which organelle will expand as water enters the cell, and what prevents the cell from bursting?

Accepted Answer

Central vacuole; cell wall

Question 14

Which process involves the lysosome fusing with a vesicle containing damaged organelles to break them down and recycle their components?

Accepted Answer

Autophagy

Question 15

Which of the following is NOT a function of the Golgi apparatus?

Accepted Answer

Synthesis of ATP

Question 16

Which organelle is most abundant in liver cells due to its role in detoxifying alcohol and other toxins?

Accepted Answer

Peroxisome

Question 17

Which of the following best explains why plant cells have a rigid structure?

Accepted Answer

Presence of a central vacuole and cell wall

Question 18

Which organelle contains its own DNA, ribosomes, and is the site of photosynthesis in plant cells?

Accepted Answer

Chloroplast

Question 19

Which cytoskeletal element is composed of actin and is involved in cell movement and muscle contraction?

Accepted Answer

Microfilaments

Question 20

A scientist observes a cell with a double membrane, circular DNA, and its own ribosomes. According to the endosymbiont theory, which organelle is being observed?

Accepted Answer

Mitochondrion

Cell Organelles and Their Functions: Lysosomes, Vacuoles, and Chloroplasts

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