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.

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1.Easy

Which structure helps organise microtubules in animal cells and contains a pair of centrioles?

  1. ACentrosome
  2. BVacuole
  3. CRibosome
  4. DNucleolus
2.Easy

Where is the genetic material of a eukaryotic cell mainly stored?

  1. AIn the vacuole
  2. BIn the cell membrane
  3. CIn the nucleus
  4. DIn the ribosomes
3.Easy

What is diffusion?

  1. ANet movement of particles from high to low concentration
  2. BMovement of water only across a membrane
  3. CMovement of particles against their concentration gradient using ATP
  4. DEngulfing of particles by the cell membrane
4.Medium

Why does DNA replication need primase?

  1. APrimase proofreads the new DNA
  2. BPrimase unwinds the DNA double helix
  3. CPrimase joins the Okazaki fragments together once their RNA primers have been removed
  4. DDNA polymerase can only extend an existing strand, so a short RNA primer is needed
5.Medium

What is crossing over during meiosis?

  1. AExchange of genetic material between homologous chromosomes in prophase I
  2. BFusion of two gametes
  3. CSeparation of sister chromatids as they move to opposite poles in anaphase II
  4. DCopying of DNA before division
6.Medium

What does it mean that the genetic code is "degenerate" (redundant)?

  1. ASome codons are never used
  2. BMost amino acids are coded by more than one codon
  3. CThe code differs completely between species
  4. DEach codon codes for several amino acids
7.Hard

Where in the cell does the electron transport chain of aerobic respiration take place?

  1. AMitochondrial matrix
  2. BCytoplasm
  3. CInner mitochondrial membrane
  4. DOuter mitochondrial membrane
8.Hard

What problem does telomerase solve?

  1. AThe shortening of chromosome ends with each round of replication
  2. BThe removal of introns from mRNA
  3. CThe joining of Okazaki fragments
  4. DThe unwinding of the double helix at each replication fork by helicase

Answer key

  1. 1. A · Centrosome
  2. 2. C · In the nucleus
  3. 3. A · Net movement of particles from high to low concentration
  4. 4. D · DNA polymerase can only extend an existing strand, so a short RNA primer is needed
  5. 5. A · Exchange of genetic material between homologous chromosomes in prophase I
  6. 6. B · Most amino acids are coded by more than one codon
  7. 7. C · Inner mitochondrial membrane
  8. 8. A · The shortening of chromosome ends with each round of replication

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