AP Biology Practice Quiz: DNA and RNA Structure

Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026

Test your understanding with short quizzes. This quiz has 14 questions to check your progress.

Question 1 of 14

According to the provided information, which of the following molecules are primarily responsible for storing and passing on genetic information?

A)Proteins and lipidsB)DNA and, in some cases, RNAC)Carbohydrates and plasmidsD)Chromosomes and proteins

All Questions (14)

According to the provided information, which of the following molecules are primarily responsible for storing and passing on genetic information?

A) Proteins and lipids

B) DNA and, in some cases, RNA

C) Carbohydrates and plasmids

D) Chromosomes and proteins

Correct Answer: B

The content explicitly states, 'Genetic information is stored in and passed on through DNA molecules (and in some cases, RNA).'

How does the chromosomal structure typically differ between prokaryotes and eukaryotes?

A) Prokaryotes have linear chromosomes, while eukaryotes have circular chromosomes.

B) Prokaryotes have multiple circular chromosomes, while eukaryotes have a single linear chromosome.

C) Prokaryotes typically have circular chromosomes, while eukaryotes have multiple linear chromosomes.

D) Both prokaryotes and eukaryotes have multiple linear chromosomes.

Correct Answer: C

The content states, 'Prokaryotes typically have circular chromosomes, while eukaryotes have multiple linear chromosomes.'

Based on the conserved base-pairing rules and structural classifications provided, which of the following is a purine?

A) Cytosine (C)

B) Thymine (T)

C) Uracil (U)

D) Guanine (G)

Correct Answer: D

The text identifies purines as Adenine (A) and Guanine (G), which are described as double-ringed structures.

Which of the following nitrogenous bases is described as a single-ringed pyrimidine?

A) Adenine (A)

B) Guanine (G)

C) Cytosine (C)

D) Both A and B

Correct Answer: C

The content specifies that pyrimidines (C, T, U) are single-ringed. Adenine and Guanine are identified as double-ringed purines.

A scientist discovers a small, extrachromosomal, circular DNA molecule within a eukaryotic cell. This molecule is best described as a:

A) Linear chromosome

B) Plasmid

C) Purine

D) Pyrimidine

Correct Answer: B

The text defines plasmids as 'small, extrachromosomal, circular DNA molecules' and notes that they can be found in 'both prokaryotes and eukaryotes.'

The structural difference between purines and pyrimidines is that:

A) Purines are single-ringed, while pyrimidines are double-ringed.

B) Purines are found only in DNA, while pyrimidines are found only in RNA.

C) Purines are double-ringed, while pyrimidines are single-ringed.

D) Purines pair with other purines, while pyrimidines pair with other pyrimidines.

Correct Answer: C

The text explicitly states that purines (A, G) are 'double-ringed' and pyrimidines (C, T, U) are 'single-ringed'.

Which statement accurately compares the genetic material found in prokaryotic and eukaryotic cells based on the provided text?

A) Only eukaryotic cells contain plasmids.

B) Both cell types can contain plasmids, but their main chromosomes differ in structure.

C) Both cell types have a single, circular chromosome.

D) Only prokaryotic cells use DNA to store hereditary information.

Correct Answer: B

The content states that 'Both prokaryotes and eukaryotes can contain plasmids.' It also specifies that 'Prokaryotes typically have circular chromosomes, while eukaryotes have multiple linear chromosomes,' indicating a difference in their main chromosome structure.

The conserved base-pairing rules in nucleic acids dictate that:

A) A double-ringed base pairs with another double-ringed base.

B) A single-ringed base pairs with another single-ringed base.

C) A purine pairs with a pyrimidine.

D) The number of Guanine bases must equal the number of Adenine bases.

Correct Answer: C

The content states that 'purines (double-ringed A, G) pair with pyrimidines (single-ringed C, T, U),' which means a purine pairs with a pyrimidine.

What is the typical structure of the main chromosome in a prokaryotic organism?

A) Multiple and linear

B) Single and linear

C) Multiple and circular

D) Circular

Correct Answer: D

The provided content states, 'Prokaryotes typically have circular chromosomes.'

A researcher is studying a eukaryotic cell and a prokaryotic cell. Which type of genetic material could be found in both?

A) Multiple linear chromosomes

B) A single circular chromosome

C) Plasmids

D) A membrane-bound nucleus containing DNA

Correct Answer: C

The text specifies that 'Both prokaryotes and eukaryotes can contain plasmids.' The other options are specific to one cell type (A to eukaryotes, B to prokaryotes) or not mentioned in the text (D).

What is the fundamental role of DNA molecules in heredity?

A) To provide structural support to the cell nucleus.

B) To catalyze metabolic reactions within the cell.

C) To store and pass on genetic information.

D) To transport molecules across the cell membrane.

Correct Answer: C

The text begins by stating that DNA is involved in 'passing hereditary information from one generation to the next' and that 'Genetic information is stored in and passed on through DNA molecules.'

Which of the following statements is best supported by the provided information about genetic material?

A) Eukaryotic cells contain multiple linear chromosomes and cannot contain plasmids.

B) Prokaryotic cells contain a single circular chromosome and multiple linear chromosomes.

C) Eukaryotic cells can contain both multiple linear chromosomes and small, circular DNA molecules.

D) All hereditary information in a eukaryotic cell is contained within its linear chromosomes.

Correct Answer: C

The text states that eukaryotes have 'multiple linear chromosomes' and that 'Both prokaryotes and eukaryotes can contain plasmids, which are small, extrachromosomal, circular DNA molecules.' Therefore, a eukaryotic cell can contain both. Option D is incorrect because plasmids are defined as extrachromosomal DNA.

Which characteristic of nucleic acids, described in the text, is fundamental to the stable storage and transfer of hereditary information?

A) The circular nature of prokaryotic chromosomes.

B) The presence of plasmids in both prokaryotes and eukaryotes.

C) The existence of conserved base-pairing rules.

D) The linear structure of eukaryotic chromosomes.

Correct Answer: C

The text describes the 'characteristics of DNA that allow it to be used as hereditary material' and then details the 'conserved base-pairing rules.' These rules ensure that DNA can be replicated accurately, which is essential for passing on hereditary information. The other options describe organizational differences, not a fundamental chemical property of the nucleic acid itself.

In a DNA molecule, if Guanine (G) is present on one strand, which base will it pair with on the opposite strand according to the purine-pyrimidine pairing rule?

A) Adenine (A)

B) Cytosine (C)

C) Thymine (T)

D) Guanine (G)

Correct Answer: B

The text states that purines (like Guanine, G) pair with pyrimidines (C, T, U). In DNA, the specific partner for Guanine is Cytosine (C).