Question 1

Which of the following best describes a gene-by-environment interaction (GxE)?

Accepted Answer

A situation where the effect of a genotype on phenotype depends on the environment.

Question 2

A researcher uses PCR to amplify a DNA fragment. If the researcher starts with a single DNA molecule and runs 4 cycles, how many DNA molecules will be present at the end, assuming perfect efficiency?

Accepted Answer

$$2^4 = 16$

Question 3

Why are repetitive DNA sequences, such as those found in telomeres and centromeres, difficult to assemble using short-read sequencing technologies?

Accepted Answer

Short reads cannot span the entire repetitive region, making it ambiguous where each read belongs.

Question 4

Which of the following is a primary goal of bioinformatics?

Accepted Answer

To develop tools and manage biological data.

Question 5

A yeast researcher uses a plasmid with a drug resistance gene and GFP to transform yeast cells. What is the main purpose of the drug resistance gene in this experiment?

Accepted Answer

To select for yeast cells that have successfully taken up the plasmid.

Question 6

Which of the following best explains why the Human Genome Project was not truly 'done' when first announced?

Accepted Answer

Some regions, especially repetitive ones, were not fully sequenced or assembled.

Question 7

Which of the following is a real-world application of recombinant DNA technology?

Accepted Answer

Production of human insulin in bacteria for diabetes treatment.

Question 8

A scientist wants to compare the genomes of two closely related species. Which technology would provide the most complete and accurate assembly, especially in regions with many repeats?

Accepted Answer

Long-read sequencing (e.g., PacBio or Oxford Nanopore)

Question 9

Which of the following best describes the difference between genetics and genomics?

Accepted Answer

Genetics focuses on individual genes, while genomics studies all the DNA in an organism.

Question 10

In a gene expression experiment, a scientist uses GFP as a reporter. What does a higher fluorescence intensity indicate?

Accepted Answer

Higher gene expression of the gene fused to GFP.

Question 11

Which of the following is a key reason why funding for basic molecular biology research is important for society?

Accepted Answer

It enables the discovery of new treatments for diseases such as cancer and the development of vaccines.

Question 12

Which of the following best describes the role of DNA ligase in recombinant DNA technology?

Accepted Answer

It joins together DNA fragments by forming phosphodiester bonds.

Question 13

A patient with phenylketonuria (PKU) can avoid disease symptoms by following a low-phenylalanine diet. This is an example of:

Accepted Answer

Gene-by-environment interaction (GxE)

Question 14

Which of the following is NOT a typical component required for a PCR reaction?

Accepted Answer

RNA polymerase

Question 15

Which of the following statements about the structure of a research lab is correct?

Accepted Answer

The Principal Investigator (PI) is responsible for leading the lab and securing research funding.

Question 16

Which of the following best explains why DNA sequencing is important for personalized medicine?

Accepted Answer

It allows for the identification of genetic variants that can influence individual responses to drugs.

Question 17

Which of the following is a correct statement about the human genome?

Accepted Answer

Protein-coding genes make up only a small percentage of the human genome.

Question 18

A scientist uses gel electrophoresis to analyze DNA fragments. Which fragments will move the fastest through the gel?

Accepted Answer

The smallest DNA fragments

Question 19

Which of the following is a major difference between bioinformatics and computational biology?

Accepted Answer

Bioinformatics focuses on developing tools and managing data, while computational biology emphasizes modeling and interpretation.

Question 20

Which Nobel Prize-winning discovery allowed for the sequencing of DNA from extinct human relatives, establishing the field of paleogenomics?

Accepted Answer

Svante Pääbo's work on ancient DNA sequencing

Biology Final Exam Review Guidance: Molecular Biology, Genetics, and Bioinformatics

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