Question 1

Which of the following statements best summarizes the Cell Theory as developed by Schleiden, Schwann, and Virchow?

Accepted Answer

All living things are made of cells, cells are the smallest living units, and all cells arise from preexisting cells.

Question 2

Which organelle is responsible for the majority of ATP production in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 3

A cell is placed in a hypertonic solution. What will most likely happen to the cell?

Accepted Answer

It will lose water and shrink, a process known as crenation or plasmolysis.

Question 4

Which of the following best describes the structure of a phospholipid in the plasma membrane?

Accepted Answer

A polar head and two nonpolar fatty acid tails

Question 5

Which type of molecular transport requires energy and moves substances against their concentration gradient?

Accepted Answer

Active transport

Question 6

Which of the following is NOT a component of the Fluid Mosaic Model of the plasma membrane?

Accepted Answer

Cellulose

Question 7

A white blood cell engulfs a bacterium by wrapping its plasma membrane around it. This process is best described as:

Accepted Answer

Phagocytosis

Question 8

Which of the following best describes the function of ribosomes?

Accepted Answer

Translate genetic code to assemble amino acids into polypeptides

Question 9

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

Accepted Answer

Eukaryotic cells contain membrane-bound organelles, prokaryotic cells do not.

Question 10

Which of the following best describes osmosis?

Accepted Answer

Movement of water from low to high solute concentration across a semi-permeable membrane

Question 11

Which organelle is responsible for modifying, sorting, and packaging proteins for secretion or delivery to other organelles?

Accepted Answer

Golgi apparatus

Question 12

Which of the following cell structures is found in plant, fungal, and prokaryotic cells, but not in animal cells?

Accepted Answer

Cell wall

Question 13

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of large or charged molecules from high to low concentration through a protein carrier

Question 14

Which cytoskeletal element is primarily responsible for cell movement and is composed of actin?

Accepted Answer

Microfilaments

Question 15

Which of the following kingdoms contains organisms that are always multicellular, lack cell walls, and are heterotrophic?

Accepted Answer

Animalia

Question 16

A scientist observes a cell with a nucleus, mitochondria, and a cell wall made of cellulose. To which kingdom does this cell most likely belong?

Accepted Answer

Plantae

Question 17

Which of the following best describes the function of lysosomes?

Accepted Answer

Digest and recycle cellular components

Question 18

Which of the following is a property of the plasma membrane that allows it to regulate the movement of substances into and out of the cell?

Accepted Answer

Semi-permeability

Question 19

Which of the following is a distinguishing feature of Archaea compared to Bacteria?

Accepted Answer

Archaea often live in extreme environments, while Bacteria typically live in environments favorable to humans.

Question 20

Which of the following best describes the role of cholesterol in the plasma membrane?

Accepted Answer

It stabilizes membrane fluidity and structure.

Cell Structure, Membrane Function, and Molecular Transport in Microbiology

Study Guide - Practice Questions