Question 1

Which of the following best describes the primary function of lysosomes in animal cells?

Accepted Answer

Digestion and recycling of macromolecules

Question 2

Lysosomal enzymes are most active at which pH range?

Accepted Answer

$$4.8 - 5.0$$

Question 3

If a large number of lysosomes leak their contents into the cytosol, what is the most likely consequence for the cell?

Accepted Answer

Cellular autolysis (self-digestion)

Question 4

Which organelle is most abundant in leukocytes (white blood cells) due to their role in digesting invading microorganisms?

Accepted Answer

Lysosomes

Question 5

What is the main function of contractile vacuoles in single-celled freshwater organisms?

Accepted Answer

Removal of excess water to maintain osmotic balance

Question 6

Which organelle is the site of photosynthesis in plant cells?

Accepted Answer

Chloroplast

Question 7

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

Accepted Answer

Synthesis of DNA

Question 8

The '9 + 2' arrangement of microtubules is characteristic of which cellular structures?

Accepted Answer

Cilia and flagella

Question 9

Which structure acts as the foundation for the assembly of cilia and flagella?

Accepted Answer

Basal body

Question 10

During cell division in animal cells, which organelle forms the mitotic spindle?

Accepted Answer

Centrioles

Question 11

Which of the following is a major component of plant cell walls and is synthesized from sugar molecules?

Accepted Answer

Cellulose

Question 12

What is the function of plasmodesmata in plant cells?

Accepted Answer

Channels for water and small molecules to pass between cells

Question 13

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

Accepted Answer

Tight junctions

Question 14

Gap junctions in animal cells are functionally similar to which plant cell structure?

Accepted Answer

Plasmodesmata

Question 15

Which of the following best explains why lysosomal enzymes are not very active in the cytosol?

Accepted Answer

The cytosol has a neutral pH

Question 16

A mutation causes the basal body of a cilium to have only 8 microtubule triplets instead of 9. Which cellular process would most likely be affected?

Accepted Answer

Ciliary movement

Question 17

Which of the following is a function of the extracellular matrix in animal cells?

Accepted Answer

Holding cells together in tissues and providing support

Question 18

Which organelle is responsible for forming the mitotic spindle during cell division, and what is its structural composition?

Accepted Answer

Centrioles; composed of 9 sets of microtubules arranged in a ring

Question 19

Which of the following equations best represents the process of photosynthesis occurring in chloroplasts?

Accepted Answer

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

Question 20

A patient has a genetic disorder that prevents the formation of anchoring junctions in skin cells. Which symptom would most likely be observed?

Accepted Answer

Frequent skin tearing due to lack of mechanical strength

A Tour of the Cell: Structure and Function of Cell Organelles

Study Guide - Practice Questions