Question 1

Which scientist is credited with the statement 'Omnis cellula e cellula,' and what does it mean in the context of cell theory?

Accepted Answer

Rudolf Virchow; All cells arise from preexisting cells

Question 2

A red blood cell is placed in a hypotonic solution. Predict and explain the outcome using the principles of osmosis.

Accepted Answer

The cell will swell and may burst due to water entering the cell

Question 3

Which of the following best describes the Fluid Mosaic Model of the plasma membrane?

Accepted Answer

A flexible bilayer of phospholipids with embedded proteins and cholesterol

Question 4

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

Accepted Answer

Active transport

Question 5

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

Accepted Answer

Phagocytosis

Question 6

Which organelle is responsible for the synthesis of proteins that are exported from the cell?

Accepted Answer

Rough endoplasmic reticulum

Question 7

Which of the following statements about prokaryotic cells is correct?

Accepted Answer

They contain ribosomes but lack a nucleus

Question 8

Which component of the plasma membrane is primarily responsible for its selective permeability?

Accepted Answer

Phospholipid bilayer

Question 9

A cell is placed in a hypertonic solution. What will happen to the cell and why?

Accepted Answer

It will shrink due to water leaving the cell

Question 10

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules from high to low concentration through a protein carrier, without energy

Question 11

Which organelle is the primary site of ATP production in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 12

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

Accepted Answer

Lipid synthesis

Question 13

Which cell structure is found in plants, fungi, and prokaryotes, but NOT in animal cells?

Accepted Answer

Cell wall

Question 14

Which of the following best explains why water moves into a cell placed in a hypotonic solution?

Accepted Answer

Water moves from low to high solute concentration to establish equilibrium

Question 15

Which of the following is a distinguishing feature of eukaryotic cells compared to prokaryotic cells?

Accepted Answer

Presence of membrane-bound organelles

Question 16

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

Accepted Answer

Animalia

Question 17

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

Accepted Answer

It stabilizes membrane fluidity

Question 18

Which of the following is a function of microtubules in eukaryotic cells?

Accepted Answer

Cell movement and division

Question 19

Which process is used by cells to export large molecules, such as hormones or waste products, out of the cell?

Accepted Answer

Exocytosis

Question 20

Which of the following best describes the main difference between passive and active transport across the plasma membrane?

Accepted Answer

Passive transport moves molecules down their concentration gradient without energy, active transport moves them against the gradient using energy

Cell Structure, Membranes, and Molecular Transport in Microbiology

Study Guide - Practice Questions