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AP Biology

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About AP Biology Exam & Practice Bank

Prepare for AP Biology with syllabus-aligned multiple choice practice questions. Designed for students, professionals, and exam candidates, this question bank covers core concepts, practical problem solving, and scenario evaluation across Chemistry of Life: water properties, elements of life, biological macromolecules, and how molecular structure relates to function., Cell Structure and Function: prokaryotic and eukaryotic cells, organelles, membrane structure, transport, and relationships between cell structure and function., Cellular Energetics: enzyme activity, energy transformations, cellular respiration, and photosynthesis.. Choose timed Exam Mode for a simulated test environment or Practice Mode for immediate feedback.

School and Academic · Advanced Placement (AP) Biology · 260+ MCQs

AP Biology

⏱️ Timed Exam Mode — Mock exam drill

Both parents are heterozygous for an autosomal recessive condition. What is the probability that their child will be affected?

A 75%, because three offspring genotypes contain the dominant allele

B 0%, because neither parent is affected

C 100%, because both parents carry the recessive allele

D 25%, because one of four equally likely allele combinations is homozygous recessive

Sample AP Biology MCQs with Verified Explanations

1. Both parents are heterozygous for an autosomal recessive condition. What is the probability that their child will be affected?

A: 75%, because three offspring genotypes contain the dominant allele
B: 0%, because neither parent is affected
C: 100%, because both parents carry the recessive allele
D: 25%, because one of four equally likely allele combinations is homozygous recessive

Answer & Explanation

Correct Answer: D. 25%, because one of four equally likely allele combinations is homozygous recessive

A cross between two heterozygotes produces genotypes in a 1:2:1 ratio. One of the four equally likely combinations is homozygous recessive and affected.

2. A tumor-cell biopsy shows continued division despite extensive DNA damage. Loss of the function of which protein could explain failure to halt the cell cycle?

A: Hemoglobin, which transports oxygen in red blood cells
B: Amylase, which catalyzes starch digestion
C: p53, which can activate cell-cycle arrest after DNA damage
D: Insulin, which promotes glucose uptake in responsive tissues

Answer & Explanation

Correct Answer: C. p53, which can activate cell-cycle arrest after DNA damage

The tumor suppressor p53 can halt the cell cycle after DNA damage, allowing repair or promoting cell death; its loss can permit abnormal division.

3. A muscle cell oxidizes glucose during aerobic respiration. Which molecule receives electrons at the end of the electron transport chain?

A: NADH
B: Carbon dioxide
C: Oxygen
D: Glucose

Answer & Explanation

Correct Answer: C. Oxygen

During aerobic respiration, oxygen is the terminal electron acceptor in the electron transport chain. It combines with electrons and hydrogen ions to form water.

4. Two unaffected parents are each heterozygous for an autosomal recessive condition. What is the probability that their child will be affected?

A: Three-quarters, because most offspring inherit at least one recessive allele
B: One-half, because either parent can pass the dominant allele
C: One, because both parents carry the condition
D: One-quarter, because one of four allele combinations is homozygous recessive

Answer & Explanation

Correct Answer: D. One-quarter, because one of four allele combinations is homozygous recessive

For an Aa × Aa cross, the possible genotypes are AA, Aa, Aa, and aa. One of four outcomes is homozygous recessive and affected.

5. A drug prevents cells with damaged DNA from entering mitosis. At which cell-cycle stage is the drug most directly acting?

A: Cytokinesis
B: The G2 checkpoint
C: The S phase
D: The G1 phase

Answer & Explanation

Correct Answer: B. The G2 checkpoint

The G2 checkpoint checks whether DNA replication is complete and DNA damage has been addressed before the cell proceeds into mitosis.

📋Syllabus Specification & Study Guide

📅Last Reviewed: October 2026

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Exam Overview & Curriculum Scope

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Who This Assessment Is For

Secondary and higher secondary students, board exam candidates, and tutors revising structured Advanced Placement (AP) Biology coursework.

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Syllabus Coverage & Core Assessment Domains

1 Chemistry of Life: water properties, elements of life, biological macromolecules, and how molecular structure relates to function.

2 Cell Structure and Function: prokaryotic and eukaryotic cells, organelles, membrane structure, transport, and relationships between cell structure and function.

3 Cellular Energetics: enzyme activity, energy transformations, cellular respiration, and photosynthesis.

4 Cell Communication and Cell Cycle: signal transduction, feedback mechanisms, cell-cycle regulation, mitosis, and disruptions to normal cell division.

5 Heredity and Gene Expression: meiosis, Mendelian and non-Mendelian inheritance, DNA replication, gene expression and regulation, biotechnology, and genetic variation.

6 Natural Selection and Ecology: evolution by natural selection, population genetics, speciation, evidence of common ancestry, population dynamics, community interactions, and ecosystem energy flow.

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Recommended Study Strategy

Diagnostic Benchmark

Begin with an untimed 10-question set to identify specific domain strengths and syllabus gaps.

Active Retrieval

Answer each question independently before consulting explanations; study the provided rationale for both correct choices and distractors.

Desk Retention

Save challenging questions to your Learning Desk for spaced repetition and focused revision prior to high-stakes test days.

Exam Readiness

Strive for consistent accuracy above 85% on Medium and Hard sets under timed conditions before formal examinations.

Subject guide

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Can I choose between timed exam and practice mode?

Yes. Exam Mode offers a timed simulation with score breakdown and verified certificates, while Practice Mode reveals explanations immediately after every question.

Are detailed explanations provided for each question?

Every single question includes a comprehensive rationale explaining why the correct choice is right and clarifying core syllabus concepts.

Can I get an official verified certificate of completion?

Yes! Completing any round in Exam Mode unlocks a free, verifiable Certificate of Completion that you can download or share.

AP Biology

About AP Biology Exam & Practice Bank

AP Biology

Both parents are heterozygous for an autosomal recessive condition. What is the probability that their child will be affected?

Exam Overview & Curriculum Scope

Who This Assessment Is For

Syllabus Coverage & Core Assessment Domains

Recommended Study Strategy

Frequently asked questions

Are these AP Biology practice questions completely free?

Can I choose between timed exam and practice mode?

Are detailed explanations provided for each question?

Can I get an official verified certificate of completion?

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