Question 1

Which of the following best describes the relationship between DNA, genes, and chromosomes?

Accepted Answer

Chromosomes are made up of DNA, and genes are segments of chromosomes.

Question 2

What is the role of mRNA in protein synthesis?

Accepted Answer

mRNA provides the instructions for assembling amino acids in the correct order during translation.

Question 3

Which base pairing is correct in DNA?

Accepted Answer

$$A$$ pairs with $$T$$ and $$G$$ pairs with $$C.$$

Question 4

A mutation occurs in the DNA sequence of a gene. Which of the following is the most likely consequence?

Accepted Answer

The mutation may change the amino acid sequence of the protein, potentially altering its function.

Question 5

During transcription, which molecule is synthesized from the DNA template?

Accepted Answer

mRNA

Question 6

Which of the following statements about complementary base pairing in DNA is correct?

Accepted Answer

Adenine pairs with thymine via two hydrogen bonds, and guanine pairs with cytosine via three hydrogen bonds.

Question 7

Which process involves the conversion of mRNA sequence into a polypeptide chain?

Accepted Answer

Translation

Question 8

If a DNA strand has the sequence $$5'-ATCGGTA-3'$$, what would be the complementary DNA strand?

Accepted Answer

$$3'-TAGCCAT-5'$$

Question 9

Which of the following best explains why not all cells express the same genes?

Accepted Answer

Regulatory genes control the expression of protein-coding genes, turning them on or off in different cell types.

Question 10

What is the function of a stop codon in mRNA?

Accepted Answer

It signals the end of translation, causing the release of the newly synthesized protein.

Question 11

Which of the following is a correct description of the structure of DNA?

Accepted Answer

DNA is a double-stranded molecule composed of nucleotides.

Question 12

Which of the following is NOT a function of chromosomes?

Accepted Answer

Synthesizing amino acids from glucose.

Question 13

Which statement about the process of transcription is correct?

Accepted Answer

Transcription occurs in the nucleus and produces mRNA from a DNA template.

Question 14

A mutation changes a codon from $$AAA to$$ $$AAG. $$What is the most likely effect?

Accepted Answer

The amino acid sequence may remain unchanged if both codons code for the same amino acid.

Question 15

Which of the following best describes the role of regulatory genes?

Accepted Answer

Regulatory genes control the expression of other genes, determining which genes are turned on or off.

Question 16

Which of the following is true about the directionality of DNA strands?

Accepted Answer

The two strands run in opposite directions, one 5' to 3' and the other 3' to 5'.

Question 17

Which of the following is a correct statement about the genetic code?

Accepted Answer

A codon is a sequence of three nucleotides that codes for an amino acid.

Question 18

Which of the following is a consequence of a mutation in a regulatory gene?

Accepted Answer

The expression of other genes may be altered, affecting cell function.

Question 19

Which of the following best explains why mRNA can leave the nucleus but DNA cannot?

Accepted Answer

mRNA is smaller and single-stranded, allowing it to pass through nuclear pores.

Question 20

Which of the following is a real-world consequence of a mutation in the gene coding for hemoglobin?

Accepted Answer

The mutation may result in sickle cell anemia, where the altered hemoglobin protein affects red blood cell shape and function.

Genetic Material and the Structure of Proteins: Relationships and Processes

Study Guide - Practice Questions