Question 1

Which of the following best describes the amphipathic nature of the phospholipid bilayer in the plasma membrane?

Accepted Answer

It contains both hydrophilic heads and hydrophobic tails.

Question 2

A bacterium is placed in a solution and water begins to flow into the cell, causing it to swell. Which type of solution is the bacterium in?

Accepted Answer

Hypotonic

Question 3

Which of the following is NOT a passive mechanism for the movement of molecules across membranes?

Accepted Answer

Active transport

Question 4

A scientist is studying a prokaryotic cell and observes a region containing DNA but no surrounding membrane. What is this region called?

Accepted Answer

Nucleoid

Question 5

Which of the following best explains why ribosomes are important in prokaryotic cells?

Accepted Answer

They are the site of protein synthesis and contain the 16s rRNA used in phylogenetic studies.

Question 6

Which of the following statements about Archaea is correct?

Accepted Answer

They often live in extreme environments and are more closely related to Eukarya than to Bacteria.

Question 7

A clinical microbiologist is using observable traits, morphology, and biochemical reactions to identify a bacterial species. Which manual is she most likely using?

Accepted Answer

Bergey's Manual of Determinative Bacteriology

Question 8

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules across a membrane via specific transport proteins, without energy input.

Question 9

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

Accepted Answer

Water will leave the cell, causing it to shrink.

Question 10

Which of the following is a correct statement about endospores?

Accepted Answer

Most prokaryotes do not make endospores.

Question 11

A researcher is comparing two bacterial strains that share similar traits but differ from other groups. What is the best term for this collection?

Accepted Answer

Species

Question 12

Which of the following best describes the function of plasmids in prokaryotic cells?

Accepted Answer

They are small, circular DNA molecules that can carry genes for antibiotic resistance.

Question 13

Which of the following is true regarding the movement of molecules by osmosis?

Accepted Answer

Water moves from an area of low solute concentration to high solute concentration across a semipermeable membrane.

Question 14

Which of the following best explains why Bergey's Manual of Systematic Bacteriology is important?

Accepted Answer

It provides detailed phylogenetic relationships based on sequencing information.

Question 15

A cell is using ATP to move sodium ions against their concentration gradient. Which type of transport is this?

Accepted Answer

Active transport

Question 16

Which of the following is NOT a structure found internal to the plasma membrane in prokaryotes?

Accepted Answer

Mitochondria

Question 17

A microbiologist is trying to distinguish between two bacterial species using their ability to ferment lactose and their cell shape. Which approach is she using?

Accepted Answer

Diagnostic theme based on observable traits and biochemical reactions.

Question 18

Which of the following best describes the term 'strain' in microbiology?

Accepted Answer

A subspecies or collection of bacterial cells sharing similar traits but differing from other groups.

Question 19

Which of the following equations best represents the movement of water during osmosis?

Accepted Answer

$$ \text{Water moves from} \rightarrow \text{Low solute concentration} \rightarrow \text{High solute concentration} $$

Question 20

A patient is infected with a bacterium that can survive extreme heat and dryness. Which structure is most likely responsible for this survival?

Accepted Answer

Endospore

Cell Membranes, Prokaryotic Cell Structures, and Bacterial Taxonomy

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