Cell biology worksheet with answers

Free printable Cell biology worksheet: 8 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

1.Easy

What are the building blocks (monomers) of DNA called?

  1. AFatty acids
  2. BNucleotides
  3. CMonosaccharides
  4. DAmino acids
2.Easy

How many chromosomes are in a normal human body (somatic) cell?

  1. A46
  2. B44
  3. C23
  4. D48
3.Easy

Which base pairs with adenine in DNA?

  1. AThymine
  2. BUracil
  3. CGuanine
  4. DCytosine
4.Medium

Active transport differs from facilitated diffusion because it:

  1. AMoves substances down their gradient faster by using carrier proteins
  2. BNeeds no proteins
  3. COnly moves water
  4. DUses energy to move substances against their concentration gradient
5.Medium

What is the G0 phase of the cell cycle?

  1. AA resting state in which cells have left the cycle and stopped dividing
  2. BThe final stage of mitosis
  3. CA phase found only in cancer cells that have stopped responding to signals
  4. DThe phase in which DNA is copied
6.Medium

What is crossing over during meiosis?

  1. AFusion of two gametes
  2. BSeparation of sister chromatids as they move to opposite poles in anaphase II
  3. CExchange of genetic material between homologous chromosomes in prophase I
  4. DCopying of DNA before division
7.Hard

Why does colchicine arrest dividing cells in mitosis?

  1. AIt breaks down actin filaments, so cytokinesis cannot happen
  2. BIt stops tubulin polymerising, so the spindle cannot form
  3. CIt stops DNA replication in S phase
  4. DIt destroys the nuclear envelope permanently
8.Hard

With 23 chromosome pairs, how many different chromosome combinations can independent assortment alone produce in human gametes?

  1. A23²
  2. B46
  3. C2 × 23
  4. D2²³ (about 8 million)

Answer key

  1. 1. B · Nucleotides
  2. 2. A · 46
  3. 3. A · Thymine
  4. 4. D · Uses energy to move substances against their concentration gradient
  5. 5. A · A resting state in which cells have left the cycle and stopped dividing
  6. 6. C · Exchange of genetic material between homologous chromosomes in prophase I
  7. 7. B · It stops tubulin polymerising, so the spindle cannot form
  8. 8. D · 2²³ (about 8 million)

Full step-by-step solutions: practise this topic on examproblems.com.