Question 1

Which of the following best describes a gene?

Accepted Answer

A segment of DNA that encodes a functional product, usually a protein or RNA.

Question 2

Which process is responsible for separating DNA fragments by size using an electric field?

Accepted Answer

Gel electrophoresis

Question 3

Which of the following statements about mitochondria and chloroplasts is correct?

Accepted Answer

Both organelles contain their own circular chromosomes and are inherited through the cytoplasm.

Question 4

Which of the following is NOT one of the three domains of life as established by rRNA sequence analysis?

Accepted Answer

Virus

Question 5

What is the main function of ethidium bromide (EtBr) in gel electrophoresis?

Accepted Answer

To bind to nucleic acids and allow their visualization under UV light.

Question 6

Which of the following best explains the relationship between genotype and phenotype?

Accepted Answer

Genotype refers to the genetic makeup, while phenotype is the observable trait resulting from the genotype.

Question 7

Which of the following is a correct sequence of the central dogma of molecular biology?

Accepted Answer

$DNA \rightarrow RNA \rightarrow Protein$

Question 8

Which experimental technique would you use to detect variation in mRNA levels between two cell types?

Accepted Answer

Northern blotting

Question 9

Which of the following is a direct result of artificial selection, as illustrated by the domestication of dogs?

Accepted Answer

Increased frequency of desired traits in a population over generations.

Question 10

Which of the following statements about the Human Genome Project is correct?

Accepted Answer

It revealed that only about 1.5% of the human genome contains exons.

Question 11

Which of the following best describes a clade in a phylogenetic tree?

Accepted Answer

A group of organisms that share a common ancestor and derived characteristics.

Question 12

Which process is responsible for the transfer of DNA from a gel to a synthetic membrane for further analysis?

Accepted Answer

Southern blotting

Question 13

Which of the following is NOT a process that leads to changes in allele frequencies in a population over time?

Accepted Answer

Photosynthesis

Question 14

Which of the following statements about the modern synthesis of evolution is correct?

Accepted Answer

It merges evolutionary theory with experimental, mathematical, and molecular population biology.

Question 15

A researcher wants to compare the complete set of proteins expressed in two different tissues. Which field of study is most relevant?

Accepted Answer

Proteomics

Question 16

Which of the following best explains why nucleic acids migrate toward the positive electrode during gel electrophoresis?

Accepted Answer

They are negatively charged due to their phosphate backbone.

Question 17

Which of the following is a key insight from Darwin’s principles of populations?

Accepted Answer

Certain trait variants increase survival and reproduction, leading to higher frequency in the next generation.

Question 18

Which of the following best describes the relationship between alleles and phenotypic variation?

Accepted Answer

Phenotypic variation reflects underlying genetic (allele) variation.

Question 19

Which of the following is a correct example of the use of molecular homology in constructing a phylogenetic tree?

Accepted Answer

Comparing DNA sequences to identify shared derived nucleotides among species.

Question 20

Which of the following '-omics' approaches would be most useful for studying the chemical processes involving metabolites in a specific tissue?

Accepted Answer

Metabolomics

The Molecular Basis of Heredity, Variation, and Evolution: Foundations of Genetics

Study Guide - Practice Questions