Q: Which equation best describes the process of osmosis across a semipermeable membrane?

$$\text{Water moves from an area of low solute concentration to high solute concentration}$$

Question 1

Which of the following characteristics is shared by all bacteria, archaea, and eukaryotes, but NOT by viruses?

Accepted Answer

Presence of a cellular structure

Question 2

A scientist discovers a single-celled organism visible to the naked eye. What feature would most likely lead them to initially classify it as a eukaryote?

Accepted Answer

Large cell size (10–100 µm)

Question 3

Which component is unique to Gram-positive bacterial cell walls and helps them survive desiccation?

Accepted Answer

Mycolic acid

Question 4

What is the primary function of bacterial flagella?

Accepted Answer

Movement through the environment

Question 5

Which structure allows bacteria to adhere to surfaces and is important in biofilm formation?

Accepted Answer

Fimbriae

Question 6

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

Accepted Answer

Water will leave the cell, causing it to shrink

Question 7

Which equation best describes the process of osmosis across a semipermeable membrane?

Accepted Answer

$$	ext{Water moves from an area of low solute concentration to high solute concentration}$$

Question 8

Which of the following is NOT a function of the bacterial cell wall?

Accepted Answer

Controls passage of substances into and out of the cell

Question 9

Which process allows bacteria to move toward or away from environmental stimuli?

Accepted Answer

Taxis

Question 10

Which of the following statements about Mycoplasma is correct?

Accepted Answer

It is alive because it performs metabolism and reproduction

Question 11

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

Accepted Answer

Bilayer membrane containing lipopolysaccharide (LPS)

Question 12

Which equation represents the electrical potential across a cytoplasmic membrane?

Accepted Answer

$$\Delta V = V_{inside} - V_{outside}$$

Question 13

Which structure is responsible for transferring DNA from one bacterial cell to another?

Accepted Answer

Pili

Question 14

Which of the following is NOT a passive process for movement across a cytoplasmic membrane?

Accepted Answer

Active transport

Question 15

Which of the following best describes the fluid mosaic model of membrane structure?

Accepted Answer

A flexible bilayer with embedded proteins

Question 16

Which chemical component is found in the cell wall of both Gram-positive and Gram-negative bacteria?

Accepted Answer

Peptidoglycan

Question 17

A bacterium moves toward a chemical attractant. Which type of movement is it exhibiting?

Accepted Answer

Positive chemotaxis

Question 18

Which of the following is a function of the capsule in bacterial cells?

Accepted Answer

Prevents recognition by host immune system

Question 19

Which equation describes the rate of diffusion across a membrane?

Accepted Answer

$$J = -D \frac{dC}{dx}$$

Question 20

Which of the following statements about pili is correct?

Accepted Answer

Pili are longer than fimbriae but shorter than flagella

Cell Structure and Function in Microbiology Ch3-1

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