Question 1

Which of the following statements best describes the Cell Theory as proposed by Schleiden and Schwann in 1839?

Accepted Answer

All living things are composed of one or more cells, and all cells are descended from earlier generations of cells.

Question 2

A scientist is using a microscope to view the internal structure of a dead Paramecium. Which type of microscope is most appropriate for this purpose?

Accepted Answer

Transmission electron microscope (TEM)

Question 3

Which cellular structure is targeted by most antibiotics to kill bacteria without harming human cells?

Accepted Answer

Cell wall

Question 4

Which of the following is a major difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus containing linear chromosomes, while prokaryotic cells have a nucleoid region with a single circular chromosome.

Question 5

A new antibiotic is discovered that inhibits protein synthesis in bacteria. Which cellular structure is most likely affected?

Accepted Answer

Ribosomes

Question 6

Which of the following best explains why plant cells do not burst when placed in hypotonic solutions, while animal cells do?

Accepted Answer

Plant cells have a rigid cell wall made of cellulose that prevents excessive water uptake.

Question 7

Which of the following is a function of the central vacuole in plant cells?

Accepted Answer

Storage of organic nutrients and maintenance of cell shape via turgor pressure

Question 8

Which organelle is responsible for converting light energy into chemical energy in the form of sugars?

Accepted Answer

Chloroplast

Question 9

Which of the following best describes the structure of the plasma membrane according to the fluid mosaic model?

Accepted Answer

A phospholipid bilayer with embedded proteins that can move freely

Question 10

Which sequence correctly represents the flow of genetic information in a eukaryotic cell?

Accepted Answer

DNA → RNA → protein

Question 11

A mutation prevents the formation of nuclear pores in a eukaryotic cell. Which process would be directly affected?

Accepted Answer

Transport of mRNA from the nucleus to the cytoplasm

Question 12

Which of the following organelles is NOT part of the endomembrane system?

Accepted Answer

Mitochondrion

Question 13

Which of the following best explains the evolutionary origin of mitochondria and chloroplasts?

Accepted Answer

They evolved from ancient free-living prokaryotes that established residence within larger host cells (endosymbiosis).

Question 14

Which of the following is a function of lysosomes in animal cells?

Accepted Answer

Breakdown of damaged organelles and macromolecules

Question 15

A patient with a hereditary disorder affecting lysosomal enzymes is likely to experience which of the following?

Accepted Answer

Accumulation of undigested macromolecules and organelle fragments

Question 16

Which of the following structures is responsible for maintaining cell shape and enabling movement in eukaryotic cells?

Accepted Answer

Cytoskeleton

Question 17

Which of the following is a real-world consequence of defective cilia in human cells?

Accepted Answer

Accumulation of mucus in the lungs and male infertility

Question 18

Which of the following best describes the function of contractile vacuoles in freshwater protists?

Accepted Answer

They pump out excess water to prevent cell bursting.

Question 19

Which major theme of biology is illustrated by the conversion of sunlight into sugars during photosynthesis?

Accepted Answer

Pathways that transform energy and matter

Question 20

A soil bacterium produces a new antibiotic that kills Staphylococcus aureus. Which process was used to discover this antibiotic?

Accepted Answer

Screening soil bacteria for substances that kill other bacteria

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

Study Guide - Practice Questions