Question 1

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

Accepted Answer

To understand the interactions and functions of biological components as integrated systems.

Question 2

Genome sequencing is a critical step in modern microbiology. Which of the following best defines genome sequencing?

Accepted Answer

The process of determining the complete DNA sequence of an organism's genome.

Question 3

A researcher has obtained millions of short DNA reads from a bacterial sample. What is the next step to reconstruct the organism's genome?

Accepted Answer

Genome assembly

Question 4

Which of the following best describes genome annotation?

Accepted Answer

The process of identifying genes and their functions within a sequenced genome.

Question 5

Comparative genomics has revealed that prokaryotic genomes are generally smaller than eukaryotic genomes. Which of the following is a likely explanation for this observation?

Accepted Answer

Eukaryotes possess organelles with their own genomes, increasing total gene content.

Question 6

Which of the following genes are typically encoded by the genomes of mitochondria and chloroplasts?

Accepted Answer

Genes for components of the electron transport chain and ribosomal RNAs

Question 7

A scientist is comparing the genomes of two bacterial species. She finds that one species has a much larger genome and more genes related to environmental sensing. What is the most likely explanation for this observation?

Accepted Answer

The species with the larger genome likely inhabits a more variable environment, requiring more regulatory and sensory genes.

Question 8

Which of the following best illustrates how genomics approaches contribute to systems biology?

Accepted Answer

By enabling the mapping of all genes and their interactions within a cell.

Question 9

In a comparative genomics study, researchers found that two closely related bacterial species have different sets of genes for antibiotic resistance. What is the most plausible explanation for this difference?

Accepted Answer

Horizontal gene transfer can introduce new antibiotic resistance genes into bacterial genomes.

Question 10

A newly sequenced organelle genome is found to encode genes for $$	ext{rRNA}$$, $$	ext{tRNA}$$, and several proteins involved in oxidative phosphorylation. Which organelle is this most likely to be?

Accepted Answer

Mitochondrion

Question 11

Which of the following steps comes first in a typical genome sequencing project?

Accepted Answer

DNA extraction and sequencing

Question 12

A researcher is using comparative genomics to study the evolution of metabolic pathways in archaea and bacteria. Which of the following findings would best support the hypothesis that a pathway was acquired by horizontal gene transfer?

Accepted Answer

The pathway is present in distantly related species but absent in closely related ones.

Question 13

Which of the following is a direct application of genome annotation in medical microbiology?

Accepted Answer

Identifying potential drug targets by locating genes essential for pathogen survival.

Question 14

A student claims that all genes necessary for cellular respiration are encoded in the nuclear genome. Which of the following best refutes this claim?

Accepted Answer

Some genes for cellular respiration are encoded in mitochondrial genomes.

Question 15

Which of the following statements about genome size and gene content is supported by comparative genomics?

Accepted Answer

Eukaryotic genomes often contain more non-coding DNA than prokaryotic genomes.

BSC 310 Exam 4 Study Guidance: Systems Biology & Genomics

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