Question 1

Which statement best describes the Cell Theory as presented in modern biology?

Accepted Answer

All organisms are composed of cells, and cells arise only from preexisting cells.

Question 2

Why are cells generally small in size? Use the concept of surface area to volume ratio in your explanation.

Accepted Answer

Smaller cells have a higher surface area to volume ratio, which maximizes the efficiency of diffusion.

Question 3

Given the formula for the surface area of a sphere $$SA = 4\pi r^2$ and volume V$$ = \frac{4}{3}\pi $$r^3$$, what happens to the surface area to volume ratio as the radius $$r$$ increases?

Accepted Answer

The surface area to volume ratio decreases as $$r$$ increases.

Question 4

Which of the following is NOT a feature shared by both prokaryotic and eukaryotic cells?

Accepted Answer

Membrane-bound organelles

Question 5

A scientist discovers a unicellular organism with no nucleus, circular DNA, and a cell wall made of peptidoglycan. To which domain does this organism most likely belong?

Accepted Answer

Domain Bacteria

Question 6

Which organelle is responsible for sorting, chemically modifying, and packaging proteins and lipids for transport within or outside the cell?

Accepted Answer

Golgi apparatus

Question 7

A mutation disrupts the function of microtubules in a cell. Which cellular structures would be most directly affected?

Accepted Answer

Cilia, flagella, and the cytoskeleton

Question 8

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

Accepted Answer

Mitochondria and chloroplasts originated as free-living prokaryotes that were engulfed by an ancestral eukaryotic cell.

Question 9

Which structure is found only in plant cells and provides structural support as well as protection against over-expansion when water enters the cell?

Accepted Answer

Cell wall

Question 10

A cell is observed to have a large central vacuole, chloroplasts, and a cell wall. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 11

Which organelle contains hydrolytic enzymes for digestion and is found primarily in animal cells?

Accepted Answer

Lysosome

Question 12

Which of the following is a function of the smooth endoplasmic reticulum?

Accepted Answer

Detoxification of drugs and synthesis of lipids

Question 13

Which cellular structure is the control center of the eukaryotic cell and contains the genetic material?

Accepted Answer

Nucleus

Question 14

Which of the following statements about mitochondria is TRUE?

Accepted Answer

Mitochondria contain their own DNA and ribosomes.

Question 15

A cell is exposed to a toxin that inhibits the function of peroxisomes. Which process would be most directly impaired?

Accepted Answer

Breakdown of hydrogen peroxide and fatty acids

Question 16

Which of the following is a correct sequence for the flow of proteins destined for secretion from a eukaryotic cell?

Accepted Answer

Endoplasmic reticulum → Golgi apparatus → Plasma membrane

Question 17

Which of the following best describes the function of the cytoskeleton?

Accepted Answer

It provides structural support, maintains cell shape, and assists in cell movement.

Question 18

Which of the following is a real-world example of an extremophile archaeon and its environment?

Accepted Answer

Methanobrevibacter living in the human intestine

Question 19

Which of the following is a function of plant cell central vacuoles?

Accepted Answer

Maintaining water balance and storing hazardous wastes, nutrients, or pigments

Question 20

Which of the following statements about prokaryotic cells is correct?

Accepted Answer

Prokaryotic cells lack membrane-bound organelles.

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

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