Question 1

Which of the following best describes the flow of genetic information in a eukaryotic cell, as depicted in the central dogma of molecular biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Question 2

A scientist is using PCR to amplify a segment of DNA. Which of the following is the correct sequence of steps in one PCR cycle?

Accepted Answer

Denaturation $$\rightarrow$$ Annealing $$\rightarrow$$ Extension

Question 3

Which of the following mutations is most likely to result in a nonfunctional protein?

Accepted Answer

A nonsense mutation that introduces a premature stop codon

Question 4

A patient is diagnosed with sickle cell disease, which is caused by a single nucleotide substitution in the hemoglobin gene. This is an example of which type of mutation?

Accepted Answer

Point mutation

Question 5

Which of the following best explains why cancer can result from mutations in proto-oncogenes?

Accepted Answer

Proto-oncogenes normally promote cell division, so mutations can convert them into oncogenes that cause uncontrolled cell growth.

Question 6

A researcher uses a restriction enzyme to cut a DNA molecule. Which property of restriction enzymes makes them useful for recombinant DNA technology?

Accepted Answer

They cut DNA at specific sequences, producing predictable fragments.

Question 7

Which of the following best describes the difference between mitosis and meiosis?

Accepted Answer

Mitosis produces two identical diploid cells, while meiosis produces four genetically unique haploid cells.

Question 8

A woman who is a carrier for a recessive allele for cystic fibrosis (genotype Ff) and a man who is homozygous dominant (FF) have a child. What is the probability that their child will be a carrier?

Accepted Answer

$$0.5$$

Question 9

Which of the following best explains why Down syndrome is more common in children born to older mothers?

Accepted Answer

Nondisjunction during meiosis increases with maternal age, leading to an extra chromosome 21.

Question 10

A scientist wants to separate DNA fragments by size. Which laboratory technique should they use?

Accepted Answer

Gel electrophoresis

Question 11

Which of the following statements about stem cells is correct?

Accepted Answer

Stem cells can differentiate into various cell types and self-renew.

Question 12

A DNA microarray is used to:

Accepted Answer

Measure the expression levels of thousands of genes simultaneously

Question 13

Which of the following best describes the law of independent assortment?

Accepted Answer

Alleles for different genes segregate independently during gamete formation.

Question 14

Which of the following is a real-world application of CRISPR-Cas9 technology?

Accepted Answer

Editing genes to correct mutations in human embryos

Question 15

A pedigree shows that a trait appears in every generation and affects both males and females equally. What is the most likely mode of inheritance?

Accepted Answer

Autosomal dominant

Question 16

Which of the following best describes the function of a test cross in genetics?

Accepted Answer

To determine the genotype of an individual with a dominant phenotype

Question 17

Which of the following statements about gel electrophoresis is correct?

Accepted Answer

DNA fragments are separated based on their size and charge.

Question 18

Which of the following is a key difference between gene regulation in bacteria and eukaryotes?

Accepted Answer

Bacteria use operons to regulate groups of genes, while eukaryotes typically regulate genes individually.

Question 19

A solution has a pH of 4. What is the hydrogen ion concentration $$[H^+] in $$moles per liter?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ M

Question 20

Which of the following best describes the purpose of the Human Genome Project?

Accepted Answer

To sequence and map all the genes in the human genome

Comprehensive Study Notes: DNA, Genetics, and Biotechnology

Study Guide - Practice Questions

Study Guide - Flashcards