Question 1

Which of the following best describes the significance of Pasteur's swan-neck flask experiment?

Accepted Answer

It provided evidence that microorganisms are present in the air and disproved spontaneous generation, supporting biogenesis.

Question 2

Which of the following is NOT a hallmark (minimum requirement) of cellular life?

Accepted Answer

Ability to infect other cells as an obligate intracellular parasite

Question 3

A patient is diagnosed with tuberculosis. Which staining procedure would be most significant in identifying the causative agent?

Accepted Answer

Acid-fast stain

Question 4

Which of the following statements about prokaryotic and eukaryotic cells is TRUE?

Accepted Answer

Prokaryotes have peptidoglycan in their cell walls, while eukaryotes (if they have cell walls) do not.

Question 5

Which of the following best explains why viruses are not considered living organisms?

Accepted Answer

They do not possess ribosomes and cannot carry out metabolism independently.

Question 6

Which of the following is a beneficial activity of microorganisms in the environment?

Accepted Answer

Decomposing organic matter and recycling nutrients

Question 7

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

Accepted Answer

Water will move out of the cell, causing plasmolysis.

Question 8

Which of the following statements about Gram-negative and Gram-positive bacteria is CORRECT?

Accepted Answer

Gram-negative bacteria possess an outer membrane containing lipopolysaccharide (LPS), while Gram-positive bacteria do not.

Question 9

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

Accepted Answer

Protein synthesis

Question 10

Which of the following is a correct comparison between light microscopy and electron microscopy?

Accepted Answer

Electron microscopy uses a beam of electrons and achieves higher magnification and resolution than light microscopy.

Question 11

Which of the following is a feature of the fluid-mosaic model of the plasma membrane?

Accepted Answer

Proteins and lipids move laterally within the bilayer, giving the membrane flexibility.

Question 12

Which of the following is TRUE regarding the endosymbiosis theory?

Accepted Answer

It proposes that mitochondria and chloroplasts originated from free-living prokaryotes engulfed by ancestral eukaryotic cells.

Question 13

Which of the following best describes quorum sensing in bacteria?

Accepted Answer

A cell-to-cell communication mechanism that regulates gene expression in response to population density.

Question 14

Which of the following is a correct statement about the movement of molecules across the plasma membrane?

Accepted Answer

Passive diffusion allows small, nonpolar molecules to cross the membrane without energy input.

Question 15

Which of the following is an example of an exergonic reaction?

Accepted Answer

Hydrolysis of ATP to ADP and inorganic phosphate: $$ \mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy} $$

Question 16

Which of the following is NOT a function of proteins in the cell?

Accepted Answer

Serving as genetic material

Question 17

Which of the following statements about biofilms is CORRECT?

Accepted Answer

Biofilms can form on medical devices and contribute to persistent infections.

Question 18

Which of the following best describes the role of hydrogen bonds in biological molecules?

Accepted Answer

They stabilize the secondary and tertiary structures of proteins and the double helix of DNA.

Question 19

A microbiologist is using MacConkey agar to culture bacteria from a patient sample. Which of the following best describes this medium?

Accepted Answer

It is a selective and differential medium that inhibits Gram-positive bacteria and differentiates lactose fermenters.

Question 20

Which of the following is the correct order of the phases in a typical bacterial growth curve?

Accepted Answer

Lag phase, log (exponential) phase, stationary phase, death phase

MCB2000 Exam ONE Study Guide – Step-by-Step Microbiology Guidance

스터디 가이드 - 연습 문제