Question 1

Which of the following best describes the primary goal of systems biology in microbiology?

Accepted Answer

To provide an overview of an organism’s response to its environment by integrating multiple methodologies.

Question 2

What is the main difference between genome sequencing and genome annotation?

Accepted Answer

Genome sequencing determines the order of nucleotides, while annotation identifies and labels genes and functional sequences.

Question 3

Which of the following statements about Sanger sequencing is correct?

Accepted Answer

It uses chain-terminating dideoxyribonucleotides (ddNTPs) to generate DNA fragments of varying lengths.

Question 4

Why is genome annotation considered the 'bottleneck' in genomics?

Accepted Answer

It takes more time to annotate genomes than to sequence and assemble them.

Question 5

A researcher is comparing the genomes of two bacterial species. She finds that one has a much larger genome and more genes for transcriptional regulation. What can she infer about the lifestyle of the bacterium with the larger genome?

Accepted Answer

It is likely capable of adapting to a wider range of environments and metabolic conditions.

Question 6

Which of the following is a function of organelle genomes in eukaryotic cells?

Accepted Answer

Encoding rRNAs, tRNAs, and proteins involved in transcription, translation, and energy metabolism.

Question 7

Which of the following best describes a gene family?

Accepted Answer

A group of gene homologs that share a common evolutionary ancestor.

Question 8

What is the difference between paralogs and orthologs?

Accepted Answer

Paralogs arise from gene duplication within an organism, while orthologs are genes in different species that descended from a common ancestor.

Question 9

Which of the following is NOT a mechanism of horizontal gene transfer in prokaryotes?

Accepted Answer

Binary fission

Question 10

A bacterial strain is found to have a chromosomal island with a different GC content and codon bias compared to the rest of its genome. What is the most likely origin of this chromosomal island?

Accepted Answer

It was acquired through horizontal gene transfer from another organism.

Question 11

Which of the following best defines the pan genome of a bacterial species?

Accepted Answer

The core genome plus all additional genes found in one or more strains.

Question 12

Which of the following statements about transposons is correct?

Accepted Answer

They can move between different DNA molecules and cause chromosomal rearrangements.

Question 13

A pathogenic strain of E. coli has a genome 11% larger than a non-pathogenic strain. What is the most likely explanation for this difference?

Accepted Answer

The pathogenic strain contains pathogenicity islands encoding virulence factors.

Question 14

Which of the following is a likely consequence of a whole genome duplication event in a eukaryotic microbe?

Accepted Answer

Retention of some duplicated genes, which may evolve new functions.

Question 15

Which of the following best describes the relationship between genome size and the number of open reading frames (ORFs) in prokaryotes?

Accepted Answer

Genome size and ORF content are strongly correlated; each megabase encodes approximately 1000 ORFs.

Question 16

Which of the following is a characteristic feature of hypothetical proteins identified during genome annotation?

Accepted Answer

They lack sufficient sequence homology to known proteins, so their function cannot be proposed.

Question 17

Which of the following is a real-world application of genomics in microbiology?

Accepted Answer

Monitoring disease outbreaks and designing vaccines.

Question 18

Which of the following statements about the genomes of mitochondria and chloroplasts is correct?

Accepted Answer

Both organelles encode rRNAs, tRNAs, and some proteins, but many required proteins are encoded by nuclear genes.

Question 19

A scientist finds a block of genes in a bacterial chromosome that encodes the ability to degrade a pollutant and is flanked by inverted repeats. What is this block of genes most likely called?

Accepted Answer

A chromosomal island

Question 20

Which of the following equations best represents the relationship between the number of ORFs ($$N_{ORF}) $$and genome size in megabases ($$G) in $$prokaryotes?

Accepted Answer

$$N_{ORF} = 1000 	imes G$$

Microbial Systems Biology and Genome Evolution: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards