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 organelle breaks down hydrogen peroxide using the enzyme catalase?

  1. ALysosome
  2. BRibosome
  3. CPeroxisome
  4. DGolgi apparatus
2.Easy

Which base pairs with adenine in DNA?

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

Who proposed the double-helix model of DNA in 1953?

  1. AWatson and Crick
  2. BMeselson and Stahl
  3. CMendel and Darwin
  4. DHershey and Chase
4.Medium

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

  1. AEach codon codes for several amino acids
  2. BMost amino acids are coded by more than one codon
  3. CSome codons are never used
  4. DThe code differs completely between species
5.Medium

In which direction do DNA and RNA polymerases add new nucleotides?

  1. AIn both directions equally
  2. B3′ to 5′
  3. CFrom the centromere outwards
  4. D5′ to 3′
6.Medium

What is the net ATP yield of glycolysis per molecule of glucose?

  1. A4 ATP
  2. B36 ATP
  3. C2 ATP
  4. D1 ATP
7.Hard

In eukaryotic mRNA processing, splicing removes:

  1. AThe poly-A tail
  2. BThe 5′ cap
  3. CExons
  4. DIntrons
8.Hard

Cholera toxin modifies the alpha subunit of Gs so it cannot hydrolyse GTP. Why does this cause severe watery diarrhoea?

  1. AThe toxin destroys the villi
  2. BcAMP falls, so gut cells stop absorbing water and sodium from the lumen
  3. CcAMP stays high in gut cells, driving chloride and water secretion
  4. DThe toxin blocks aquaporins in the colon

Answer key

  1. 1. C · Peroxisome
  2. 2. A · Thymine
  3. 3. A · Watson and Crick
  4. 4. B · Most amino acids are coded by more than one codon
  5. 5. D · 5′ to 3′
  6. 6. C · 2 ATP
  7. 7. D · Introns
  8. 8. C · cAMP stays high in gut cells, driving chloride and water secretion

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