Question 1

Which sequencing method was primarily used to complete the Human Genome Project, and what is a key feature of this method?

Accepted Answer

Dideoxy chain termination (Sanger) method; it relies on chain-terminating nucleotides to generate DNA fragments of varying lengths.

Question 2

In whole-genome shotgun sequencing, what is the main computational challenge?

Accepted Answer

Assembling millions of overlapping short DNA fragments into a contiguous genome sequence.

Question 3

Which organism has the largest genome among the following: E. coli, Drosophila, Human, Wheat, Dinoflagellate algae?

Accepted Answer

Dinoflagellate algae

Question 4

What is the primary function of the NCBI BLAST software?

Accepted Answer

To search for sequence similarity between DNA or protein sequences.

Question 5

Gene annotation involves identifying which of the following features in a genome?

Accepted Answer

Start and stop codons, untranslated regions (UTRs), splice sites, and regulatory sequences.

Question 6

Which statement best describes the relationship between genome size and organismal complexity?

Accepted Answer

There is no systematic relationship between genome size and phenotype within each domain of life.

Question 7

Most of the human genome consists of which type of DNA?

Accepted Answer

Repetitive DNA, much of which is composed of transposable elements

Question 8

Transposons move within the genome by which mechanism?

Accepted Answer

Via a DNA intermediate and a transposase enzyme

Question 9

Retrotransposons are characterized by which process?

Accepted Answer

Copy-and-paste movement via an RNA intermediate and reverse transcriptase

Question 10

What is a potential evolutionary benefit of transposable elements?

Accepted Answer

They can contribute to the generation of new genes through gene duplication and exon shuffling.

Question 11

Which mechanism is most likely responsible for the expansion of the beta-globin gene family on chromosome 11?

Accepted Answer

Unequal crossing over during meiosis I

Question 12

Polyploidy is best described as:

Accepted Answer

A condition in which an organism has one or more extra sets of chromosomes.

Question 13

Which equation best represents the coverage of a genome during sequencing?

Accepted Answer

Coverage $$= \frac{	ext{Total number of bases sequenced}}{	ext{Genome size}}$$

Question 14

Alternative splicing allows eukaryotic genomes to:

Accepted Answer

Produce more than one polypeptide per gene.

Question 15

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

Accepted Answer

Identifying conserved protein domains to predict gene function across species.

Question 16

What is the main purpose of a genome browser, such as the UCSC Genome Browser?

Accepted Answer

To visualize and explore annotated genome sequences and their features.

Question 17

Which process can result in exon shuffling and the evolution of new genes?

Accepted Answer

Errors in meiotic recombination and movement of transposable elements.

Question 18

Which of the following best explains why humans have fewer genes than expected, yet are highly complex?

Accepted Answer

Alternative splicing allows a single gene to produce multiple proteins.

Question 19

What is a multigene family?

Accepted Answer

A group of genes with similar DNA sequences that encode similar proteins, often performing related functions.

Question 20

Which of the following is NOT a typical feature of prokaryotic genomes compared to eukaryotic genomes?

Accepted Answer

Large amounts of repetitive noncoding DNA

Lecture 23 (Unit 2) Genomes: Sequencing, Structure, and Evolution

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