Question 1

Which of the following statements best describes the function of the bacterial glycocalyx capsule?

Accepted Answer

It helps the cell adhere to surfaces and protects it from being recognized by the host's immune system.

Question 2

A scientist is studying a microorganism that has a single circular chromosome, lacks a nucleus, and possesses a cell wall made of peptidoglycan. To which domain does this organism most likely belong?

Accepted Answer

Bacteria

Question 3

Which structure is responsible for the corkscrew motion observed in spirochetes, and what is its unique arrangement?

Accepted Answer

Endoflagella; spirals around the cell within the periplasmic space

Question 4

Which of the following is a distinguishing feature of Gram-negative bacteria compared to Gram-positive bacteria?

Accepted Answer

Presence of an outer membrane containing lipopolysaccharide (LPS)

Question 5

A patient is experiencing fever, vasodilation, and shock after a bacterial infection. Which component of the bacterial cell wall is most likely responsible for these symptoms?

Accepted Answer

Lipid A of lipopolysaccharide (LPS)

Question 6

Which of the following equations correctly represents the process of osmosis across a semipermeable membrane?

Accepted Answer

$$J_{water} = P_{water} (C_{water, outside} - C_{water, inside})$$

Question 7

Which of the following is NOT a function of bacterial fimbriae?

Accepted Answer

Transfer of DNA between cells

Question 8

Which organelle is present in all eukaryotic cells but absent in prokaryotic cells, and acts as the 'control center' of the cell?

Accepted Answer

Nucleus

Question 9

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

Accepted Answer

The cell will lose water and shrink (plasmolysis).

Question 10

Which of the following statements about bacterial endospores is correct?

Accepted Answer

Endospores protect bacterial DNA and allow survival in harsh conditions.

Question 11

Which of the following is a unique external structure found in some Archaea but not in Bacteria or Eukarya?

Accepted Answer

Hami

Question 12

Which of the following best describes the movement of eukaryotic flagella?

Accepted Answer

Whip-like undulating movement

Question 13

Which equation best represents the energy requirement for active transport across a cell membrane?

Accepted Answer

$$\Delta G \u003e 0$$

Question 14

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

Accepted Answer

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

Question 15

Which of the following is true regarding the cell wall composition of Archaea?

Accepted Answer

It lacks peptidoglycan and may contain pseudopeptidoglycan.

Question 16

Which of the following is a function of the cytoplasmic membrane in all domains of life?

Accepted Answer

Selective permeability controlling passage of substances

Question 17

A Gram-positive bacterium is exposed to penicillin. Why is it more susceptible to this antibiotic than a Gram-negative bacterium?

Accepted Answer

It has a thick peptidoglycan layer that absorbs the antibiotic.

Question 18

Which of the following is NOT a characteristic common to all living cells (Bacteria, Archaea, Eukaryotes)?

Accepted Answer

Host cell replication

Question 19

Which of the following best describes the role of pili in bacterial cells?

Accepted Answer

Transfer of DNA between cells during conjugation

Question 20

Which of the following is a correct sequence in the biological classification hierarchy?

Accepted Answer

Domain \u003e Kingdom \u003e Phylum \u003e Class \u003e Order \u003e Family \u003e Genus \u003e Species

Cell Structure and Function: Microbiology Study Notes

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