Question 1

Which of the following best describes the process of semiconservative DNA replication?

Accepted Answer

Each new DNA molecule consists of one parental strand and one newly synthesized strand.

Question 2

A scientist is studying a gene that is only expressed when both alleles are identical. What is the genotype of the organism for this gene?

Accepted Answer

Homozygous

Question 3

Which of the following statements about Chargaff's rule is correct?

Accepted Answer

The amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine.

Question 4

During translation, which type of RNA carries amino acids to the ribosome?

Accepted Answer

tRNA

Question 5

A mutation changes a codon from $	ext{UAC}$ to $	ext{UAA}$. What is the likely effect on the resulting protein?

Accepted Answer

The protein will be prematurely terminated.

Question 6

Which of the following best explains the Law of Segregation (Mendel's First Law)?

Accepted Answer

Each individual has two alleles for each gene, which separate during gamete formation so that each gamete receives only one allele.

Question 7

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

Accepted Answer

Autosomal dominant

Question 8

Which of the following is a function of microRNAs (miRNAs) in eukaryotic cells?

Accepted Answer

They regulate gene expression by binding to mRNA and inhibiting translation.

Question 9

In a dihybrid cross between two heterozygous pea plants ($RrYy 	imes RrYy$), what is the expected phenotypic ratio among the offspring?

Accepted Answer

$9:3:3:1$

Question 10

Which of the following best describes the role of promoters in gene expression?

Accepted Answer

They help regulate the initiation of transcription by providing a binding site for RNA polymerase.

Question 11

A scientist uses gel electrophoresis to separate DNA fragments. Which property of the fragments primarily determines their movement through the gel?

Accepted Answer

The length (size) of the fragments

Question 12

Which of the following is true about autosomal inheritance?

Accepted Answer

Traits are carried on non-sex chromosomes and are inherited equally by males and females.

Question 13

Which process is responsible for the formation of gametes with half the number of chromosomes as the original cell?

Accepted Answer

Meiosis

Question 14

A researcher is analyzing a protein and wants to determine its abundance in different tissues. Which technique should they use?

Accepted Answer

Western blotting

Question 15

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

Accepted Answer

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

Question 16

If a DNA coding strand has the sequence $5'	ext{ATGCGT}\ 3'$, what will be the sequence of the mRNA transcribed from this gene?

Accepted Answer

$5'	ext{AUGCGU}\ 3'$

Question 17

Which of the following best describes the function of ribosomal RNA (rRNA)?

Accepted Answer

It forms the core of the ribosome and catalyzes peptide bond formation.

Question 18

A population of beetles has a gene with two alleles, $A$ and $a$. If the frequency of $A$ is $0.7$ and the frequency of $a$ is $0.3$, what is the expected frequency of heterozygotes ($Aa$) under Hardy-Weinberg equilibrium?

Accepted Answer

$0.42$

Question 19

Which of the following is NOT one of the four processes that lead to changes in allele frequencies in a population over time?

Accepted Answer

Transcription

Genetics: Core Concepts, Molecular Mechanisms, and Inheritance Patterns

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