Question 1

Which of the following is NOT considered one of the four fundamental processes of life shared by all living things?

Accepted Answer

Photosynthesis

Question 2

A scientist observes a cell that lacks a nucleus, has a diameter of 1 µm, and contains peptidoglycan in its cell wall. Which type of cell is most likely being observed?

Accepted Answer

Bacterial cell

Question 3

Which structure in bacteria is primarily responsible for movement and can rotate either clockwise or counterclockwise?

Accepted Answer

Flagella

Question 4

A Gram-negative bacterium is exposed to an antibiotic that targets peptidoglycan. Which additional structure may help protect it from the antibiotic compared to a Gram-positive bacterium?

Accepted Answer

Outer membrane containing lipopolysaccharide (LPS)

Question 5

Which of the following best describes the function of bacterial capsules?

Accepted Answer

They prevent bacteria from being recognized by host immune cells.

Question 6

A cell is placed in a hypertonic solution. What is the most likely outcome for a bacterial cell with a cell wall?

Accepted Answer

The cell will undergo plasmolysis as water leaves the cytoplasm.

Question 7

Which of the following transport processes requires energy and moves substances against their concentration gradient?

Accepted Answer

Active transport

Question 8

Which equation best represents the net movement of water during osmosis across a semipermeable membrane?

Accepted Answer

$$\Delta \Psi = \Psi_{outside} - \Psi_{inside}$$

Question 9

Which of the following statements about endospores is TRUE?

Accepted Answer

Endospores are resistant to heat, radiation, and chemicals.

Question 10

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

Accepted Answer

Eukaryotic ribosomes are 80S, while prokaryotic ribosomes are 70S.

Question 11

A researcher discovers a microorganism with a cell wall composed of specialized polysaccharides and proteins, but no peptidoglycan. Which domain does this organism most likely belong to?

Accepted Answer

Archaea

Question 12

Which of the following structures is found in eukaryotic cells but NOT in prokaryotic cells?

Accepted Answer

Nucleus

Question 13

Which process is unique to eukaryotic cells and involves the engulfment of large particles by the cell membrane?

Accepted Answer

Endocytosis

Question 14

According to the endosymbiotic theory, which organelle originated from an aerobic prokaryote?

Accepted Answer

Mitochondrion

Question 15

Which of the following best explains why Gram-negative bacteria may cause fever and shock in humans?

Accepted Answer

Release of lipid A from lipopolysaccharide (LPS) in the outer membrane

Question 16

A cell is observed to have a cytoskeleton composed of tubulin microtubules, actin microfilaments, and intermediate filaments. Which type of cell is this?

Accepted Answer

Eukaryotic cell

Question 17

Which of the following is TRUE regarding the movement of eukaryotic flagella?

Accepted Answer

They undulate in a wave-like motion.

Question 18

Which formula best represents the calculation of osmotic pressure ($$\Pi) in a $$solution?

Accepted Answer

$$\Pi = iMRT$$

Question 19

A patient is infected with a bacterium that survives desiccation and resists many antibiotics due to a waxy cell wall. Which component is most likely responsible for these properties?

Accepted Answer

Mycolic acid

Question 20

Which of the following statements about viruses is CORRECT based on the processes of life?

Accepted Answer

Viruses rely on host cells for replication.

Cell Structure and Function – Microbiology Study Notes (Chapter 3)

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