Question 1

Which of the following best describes the metagenomics approach as illustrated in the first image?

Accepted Answer

Sequencing pooled DNA from multiple species in an environmental sample to analyze community composition.

Question 2

In the context of the second image, which of the following statements is correct regarding the relationship between genomics, proteomics, and metabolomics?

Accepted Answer

Genomics provides the blueprint, proteomics studies the functional molecules, and metabolomics examines the small molecules produced by cellular processes.

Question 3

The device shown in the third image is most likely used for which of the following applications?

Accepted Answer

Sequencing DNA or analyzing genetic variation using microarray technology.

Question 4

The scientist shown in the fourth and fifth images is famous for discovering which genetic phenomenon?

Accepted Answer

Transposable elements (jumping genes) in maize.

Question 5

Based on the sixth image, which enzyme is required for the movement of transposons by a DNA intermediate?

Accepted Answer

Transposase

Question 6

The repetitive DNA sequences shown in the seventh image are most likely to be found in which regions of the chromosome?

Accepted Answer

Telomeres and centromeres

Question 7

The eighth image shows the organization of the globin gene family. Which evolutionary process is primarily responsible for the existence of multiple globin genes?

Accepted Answer

Gene duplication and divergence

Question 8

The ninth image illustrates a chromosomal event in human evolution. What is the event, and what evidence supports it?

Accepted Answer

A chromosomal fusion event; supported by humans having 46 chromosomes while other great apes have 48.

Question 9

The tenth image compares Hox gene expression in two arthropods. What does this comparison reveal about the evolution of animal body plans?

Accepted Answer

Small changes in Hox gene expression can lead to major differences in body segment identity and morphology.

Question 10

Which of the following best explains why humans have fewer genes than originally predicted, despite having a large genome?

Accepted Answer

Alternative splicing allows a single gene to produce multiple polypeptides.

Question 11

Which of the following is a direct application of systems biology in medicine, as described in the study materials?

Accepted Answer

Analyzing gene expression patterns in cancer to tailor treatments to individual patients.

Question 12

Which of the following statements about transposable elements is correct?

Accepted Answer

They can facilitate recombination and cause mutations by inserting into new genomic locations.

Question 13

Which of the following is a function of the BLAST tool provided by NCBI?

Accepted Answer

Comparing a DNA sequence to all sequences in GenBank to find regions of similarity.

Question 14

Which of the following best describes a short tandem repeat (STR)?

Accepted Answer

A series of repeating units of 2 to 5 nucleotides, with variable repeat numbers among individuals.

Question 15

Which of the following is a likely consequence of exon shuffling during meiosis?

Accepted Answer

Creation of new genes with novel combinations of functional domains.

Question 16

Which of the following is a key insight from the ENCODE project?

Accepted Answer

At least 80% of the human genome has a biochemical function, including noncoding regions.

Question 17

Which of the following is true about the FOXP2 gene based on comparative genomics studies?

Accepted Answer

It is highly conserved and involved in vocalization across vertebrates.

Question 18

Which of the following best explains why African genomes have higher genetic diversity than other human populations?

Accepted Answer

African populations have been evolving longer, accumulating more genetic variation.

Question 19

Which of the following is a major theme in genome evolution as described in the study materials?

Accepted Answer

Duplication, rearrangement, and mutation of DNA contribute to the evolution of new genes and functions.

Question 20

Which of the following is a correct statement about homeotic (Hox) genes?

Accepted Answer

They contain a conserved homeobox sequence and regulate body segment identity.

ch 21 study guide

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