📖 AP Biology

AP Biology Practice

AP Biology practice questions with explanations

341 Practice questions
3 Difficulty levels
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📝 Sample Questions

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Medium
Which of the following is a correct statement?
  1. A. Cancer cells exhibit anchorage dependence.
  2. B. Somatic cells exhibit density-dependent inhibition. ✓
  3. C. Somatic cells spend most of their time in mitosis.
  4. D. Cancer cells exhibit density-dependent inhibition.
Explanation: Somatic cells normally stop dividing once they form a confluent monolayer, a phenomenon known as density-dependent inhibition that prevents overcrowding. In contrast, cancer cells lose this regulatory mechanism and continue to divide even when packed tightly together, while also becoming anchorage-i
Hard
In the alpha cells in the pancreas, which produce the peptide hormone insulin, there would likely be a high concentration of which of the following?
  1. A. lysosomes
  2. B. centrioles
  3. C. smooth endoplasmic reticulum
  4. D. ribosomes ✓
Explanation: Ribosomes produce proteins, so a cell that produced large amounts of a peptide (protein) hormone would likely have a high concentration of ribosomes. Lysosomes are involved in digesting compounds; they are not involved in protein production, so choice (A) is incorrect. Choice (B) is incorrect becaus
Medium
Which of the following statements correctly describes a difference between mitosis and meiosis?
  1. A. Mitosis produces four daughter cells, whereas meiosis produces two daughter cells.
  2. B. Mitosis produces genetically different cells, whereas meiosis produces genetically identical cells.
  3. C. Mitosis produces somatic cells, whereas meiosis produces gametes. ✓
  4. D. Mitosis produces haploid cells, whereas meiosis produces diploid cells.
Explanation: Mitosis results in two genetically identical daughter cells that function as somatic cells for growth and tissue repair, while meiosis involves two rounds of division to produce four genetically unique haploid gametes (sperm or eggs). Choice (A) is incorrect because mitosis yields two cells, not fou
Medium
Conjugation, transformation, and transduction are all examples of which of the following?
  1. A. horizontal gene transfer ✓
  2. B. mutations caused by an incorrect number of chromosomes
  3. C. processes that occur only in eukaryotic cells
  4. D. methods of reducing genetic diversity
Explanation: Horizontal gene transfer is the transfer of genetic information between organisms in the same generation; conjugation, transformation, and transduction are all forms of horizontal gene transfer. Choice (B) is incorrect because having the incorrect number of chromosomes is an aneuploidy. Horizontal g
Hard
Which of the following is the enzyme used during transcription that directly generates the transcript?
  1. A. helicase
  2. B. ligase
  3. C. DNA polymerase
  4. D. RNA polymerase ✓
Explanation: RNA polymerase is the enzyme that transcribes RNA from a DNA template. Choice (A) is incorrect because helicase is the enzyme that unwinds DNA at the start of DNA replication. Ligase is used to join DNA fragments (for example, the Okazaki fragments created during the discontinuous replication of the

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