Q: Which of the following is a correct sequence for the flow of genetic information in cells?

$$DNA \rightarrow RNA \rightarrow \text{Protein}$$

Question 1

Which of the following best explains why prokaryotic cells are generally smaller than eukaryotic cells?

Accepted Answer

Prokaryotic cells lack a nucleus, which limits their size due to surface area-to-volume ratio constraints.

Question 2

A patient presents with symptoms of meningitis. Which diagnostic tool is most commonly used to confirm the diagnosis?

Accepted Answer

Lumbar puncture to obtain cerebrospinal fluid for analysis

Question 3

Which of the following best describes the difference between dehydration synthesis and hydrolysis reactions?

Accepted Answer

Dehydration synthesis joins monomers by removing water, while hydrolysis breaks polymers by adding water.

Question 4

Which of the following is a key reason why viruses are considered non-living pathogens?

Accepted Answer

They cannot carry out metabolism or reproduce independently outside a host cell.

Question 5

Which of the following best explains why it is difficult to develop drugs that specifically target viruses and eukaryotic pathogens?

Accepted Answer

Viruses use host cell machinery, and eukaryotic pathogens share many cellular features with human cells.

Question 6

A laboratory technician is using aseptic technique to inoculate a culture. What is the primary purpose of aseptic technique in this context?

Accepted Answer

To prevent contamination of the culture and the environment with unwanted microorganisms

Question 7

Which of the following best describes the function of cerebrospinal fluid (CSF) in the nervous system?

Accepted Answer

CSF cushions the brain and spinal cord, provides nutrients, and removes waste products.

Question 8

Which of the following is a correct sequence for the flow of genetic information in cells?

Accepted Answer

$$DNA ightarrow RNA ightarrow 	ext{Protein}$$

Question 9

A patient is diagnosed with septic shock. Which type of bacterial infection is more likely to lead to this condition and why?

Accepted Answer

Gram-negative infections, due to the release of endotoxins such as lipopolysaccharide (LPS)

Question 10

Which of the following best describes the main difference between selective and differential media?

Accepted Answer

Selective media inhibit the growth of some organisms while allowing others to grow; differential media distinguish between organisms based on metabolic reactions.

Question 11

Which of the following best explains why children under 1 year old should not be fed honey?

Accepted Answer

Honey may contain spores of $$Clostridium\ botulinum$$, which can germinate in infants' intestines and produce botulinum toxin.

Question 12

Which of the following is a function of the meninges in the nervous system?

Accepted Answer

They protect the brain and spinal cord by providing a supportive and protective covering.

Question 13

A patient is exposed to rabies virus. What is the recommended medical intervention to prevent full infection?

Accepted Answer

Immediate administration of post-exposure prophylaxis, including rabies immunoglobulin and vaccine

Question 14

Which of the following best describes the difference between antigenic drift and antigenic shift in influenza viruses?

Accepted Answer

Antigenic drift involves small, gradual mutations; antigenic shift involves major genetic reassortment leading to new viral subtypes.

Question 15

Which of the following best explains why leprosy is confined to the peripheral nervous system?

Accepted Answer

The causative bacterium, $$Mycobacterium\ leprae$$, grows best at the lower temperatures found in the peripheral nerves.

Question 16

Which of the following best describes the main function of buffers in living organisms?

Accepted Answer

Buffers help maintain a stable pH by neutralizing excess acids or bases.

Question 17

A bacterial culture is growing in a closed system. During which phase of the bacterial growth curve are cells most susceptible to antibiotics that target cell wall synthesis?

Accepted Answer

Log (exponential) phase

Question 18

Which of the following best explains why the polio vaccine used in the United States is the inactivated (IPV) rather than the oral (OPV) version?

Accepted Answer

IPV cannot revert to a virulent form, reducing the risk of vaccine-derived polio.

Question 19

Which of the following best describes the main difference between broad-spectrum and narrow-spectrum antibiotics?

Accepted Answer

Broad-spectrum antibiotics target a wide range of bacteria, while narrow-spectrum antibiotics target specific types.

Question 20

A patient presents with conjunctivitis. Which of the following is a common cause of this condition?

Accepted Answer

Bacterial or viral infection of the conjunctiva

Comprehensive Study Guide: Fundamentals of Microbiology (Chapters 1–18)

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