Question 1

Which of the following best defines a genome in the context of microbiology?

Accepted Answer

All the genetic information in a cell or virus, including chromosomal and extrachromosomal DNA for a cell; and DNA or RNA for a virus.

Question 2

Candida albicans can switch from a yeast form to a hyphal form inside the human body. Both forms have the same genotype. What explains the difference in their appearance and behavior?

Accepted Answer

Gene expression changes in response to environmental conditions, leading to different phenotypes.

Question 3

Which of the following is NOT a component of a cellular genome?

Accepted Answer

Capsid proteins

Question 4

A gene is best described as:

Accepted Answer

A segment of DNA that encodes a protein.

Question 5

Which of the following statements about plasmids is TRUE?

Accepted Answer

Plasmids are extrachromosomal DNA that contain non-essential genes.

Question 6

Which equation correctly represents the central dogma of molecular biology?

Accepted Answer

$DNA \rightarrow RNA \rightarrow Protein$

Question 7

Which of the following is a function of noncoding DNA?

Accepted Answer

Regulating gene expression.

Question 8

A virus with a genome composed of single-stranded RNA would be classified as having which type of genome?

Accepted Answer

RNA genome

Question 9

Which of the following best describes the relationship between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup, and phenotype is the observable characteristics resulting from gene expression.

Question 10

A patient presents with white plaques in the esophagus, as shown in the provided image. Which organism is most likely responsible for this infection, and what feature of its genome allows it to evade the immune system?

Accepted Answer

Candida albicans; genes that allow immune evasion.

Question 11

Which of the following statements about viral genomes is correct?

Accepted Answer

Viral genomes can be composed of either DNA or RNA, and can be single or double stranded.

Question 12

Which of the following best explains why Candida albicans can cause infection in humans but not in the environment?

Accepted Answer

Environmental signals trigger gene expression changes that allow tissue invasion and immune evasion.

Question 13

Which of the following is an example of extrachromosomal DNA in a cell?

Accepted Answer

Plasmid DNA

Question 14

Which of the following is a correct statement about gene expression?

Accepted Answer

Gene expression includes both transcription and translation.

Question 15

Which of the following best describes the role of mitochondrial DNA in eukaryotic cells?

Accepted Answer

It is a component of the cellular genome and encodes some proteins essential for mitochondrial function.

Microbial Genomes: Structure, Diversity, and Health Implications

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