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 base pairs with adenine in DNA?

  1. AUracil
  2. BCytosine
  3. CThymine
  4. DGuanine
2.Easy

Which type of microscope can resolve the smallest structures, such as ribosomes?

  1. ALight microscope
  2. BElectron microscope
  3. CDissecting microscope
  4. DMagnifying glass
3.Easy

What is diffusion?

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

What are aquaporins?

  1. AChannel proteins that let water cross membranes quickly
  2. BEnzymes that split water into hydrogen and oxygen in membranes
  3. CReceptors for water-soluble hormones
  4. DPumps that move sodium out of cells
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

A newly made protein has an N-terminal signal sequence. Where is it directed?

  1. AInto the nucleus
  2. BDirectly to the cytosol for use there
  3. CInto the mitochondrial matrix
  4. DInto the endoplasmic reticulum
7.Hard

Why can translation in bacteria begin before transcription of the mRNA is finished?

  1. ABacterial mRNA is spliced faster
  2. BBacteria do not use mRNA
  3. CThere is no nuclear envelope separating DNA from ribosomes
  4. DBacterial ribosomes can read the DNA template directly in the cytoplasm
8.Hard

In the intrinsic (mitochondrial) pathway of apoptosis, which event leads to caspase activation?

  1. AEntry of glucose into the mitochondria
  2. BBinding of a death ligand to the Fas receptor on the cell surface
  3. CFusion of lysosomes with the nucleus
  4. DRelease of cytochrome c from mitochondria into the cytosol

Answer key

  1. 1. C · Thymine
  2. 2. B · Electron microscope
  3. 3. C · Net movement of particles from high to low concentration
  4. 4. A · Channel proteins that let water cross membranes quickly
  5. 5. A · Exchange of genetic material between homologous chromosomes in prophase I
  6. 6. D · Into the endoplasmic reticulum
  7. 7. C · There is no nuclear envelope separating DNA from ribosomes
  8. 8. D · Release of cytochrome c from mitochondria into the cytosol

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