Question 1

Which of the following statements best describes the function of the glycocalyx capsule in bacteria?

Accepted Answer

It protects the cell from desiccation and enhances its ability to evade the host immune system.

Question 2

Which scientist is correctly matched with their contribution to cell theory?

Accepted Answer

Hooke: First observed and named 'cells' in cork tissue.

Question 3

A bacterium is placed in a hypertonic solution. Which process is most likely to occur, and what is the result?

Accepted Answer

Plasmolysis; the cell membrane will shrink away from the cell wall.

Question 4

Which of the following is a correct literal translation and description for 'eukaryotic'?

Accepted Answer

'True nucleus'; cells with membrane-bound organelles.

Question 5

Which of the following is NOT a criterion for a life form, and which of these does NOT apply to viruses?

Accepted Answer

Cell present; viruses lack cells.

Question 6

A Gram-negative bacterium is exposed to an antibiotic that targets lipid A. What is the likely effect?

Accepted Answer

The bacterium will become more susceptible to immune detection due to loss of endotoxin activity.

Question 7

Which of the following best describes the difference between peritrichous and lophotrichous flagellar arrangements?

Accepted Answer

Peritrichous: flagella distributed over the entire cell; Lophotrichous: a tuft of flagella at one end.

Question 8

Which of the following best explains why the cell membrane is considered 'selectively permeable'?

Accepted Answer

It regulates the passage of certain molecules while restricting others based on size, charge, and polarity.

Question 9

Which of the following is a function of teichoic acids in Gram-positive bacterial cell walls?

Accepted Answer

They contribute to the cell wall's rigidity and play a role in ion transport.

Question 10

A scientist observes a cell with 70S ribosomes, a nucleoid region, and a cell wall containing peptidoglycan. Which type of cell is being observed?

Accepted Answer

Prokaryotic bacterial cell

Question 11

Which of the following best describes the process of group translocation in bacteria?

Accepted Answer

A molecule is transported across the membrane and chemically modified during transport.

Question 12

Which of the following best describes the function of fimbriae in bacteria?

Accepted Answer

They facilitate attachment to surfaces and other cells.

Question 13

A cell is placed in a solution and water moves into the cell, causing it to swell and possibly burst. Which type of solution is this, and what is the process called?

Accepted Answer

Hypotonic; lysis

Question 14

Which of the following best describes the role of dipicolinic acid in bacterial endospores?

Accepted Answer

It contributes to the heat resistance and stability of the endospore.

Question 15

Which of the following correctly matches the ribosome type with its location?

Accepted Answer

70S ribosomes: found in mitochondria and prokaryotes

Question 16

Which of the following is a key difference between integral and peripheral proteins in the cell membrane?

Accepted Answer

Integral proteins are embedded within the membrane, while peripheral proteins are attached to the membrane surface.

Question 17

Which two organelles are central to the endosymbiotic theory?

Accepted Answer

Mitochondria and chloroplasts

Question 18

A patient with Tay Sachs disease has a defect in which organelle, and what is the consequence?

Accepted Answer

Lysosome; accumulation of undigested lipids in nerve cells

Question 19

Which of the following best describes the 9+2 arrangement of microtubules, and where is it found?

Accepted Answer

9 pairs of microtubules in a ring with 2 single microtubules in the center; found in cilia and flagella

Question 20

Which of the following best explains the process of coupled transport in bacterial membranes?

Accepted Answer

The movement of one molecule down its concentration gradient powers the movement of another molecule against its gradient.

Microbiology Chapter 3 Study Guide – Step-by-Step Guidance

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