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

In chromatin, DNA is wrapped around which proteins?

  1. AActins
  2. BHistones
  3. CCollagens
  4. DTubulins
2.Easy

Which organelle produces most of the cell's ATP?

  1. ALysosome
  2. BGolgi apparatus
  3. CMitochondrion
  4. DRibosome
3.Easy

What is the main role of the nucleolus?

  1. AMaking ribosomal RNA and assembling ribosome subunits
  2. BStoring ATP for the nucleus
  3. CCopying the whole genome
  4. DBreaking down damaged proteins that are tagged with ubiquitin
4.Medium

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

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

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

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

Which codon starts translation and which amino acid does it code for?

  1. AAUG, coding for glycine
  2. BUGA, coding for methionine
  3. CUAA, coding for leucine
  4. DAUG, coding for methionine
7.Hard

In E. coli, under which conditions is the lac operon most strongly transcribed?

  1. ABoth lactose and glucose present
  2. BBoth lactose and glucose absent
  3. CLactose absent and glucose present
  4. DLactose present and glucose absent
8.Hard

Why does colchicine arrest dividing cells in mitosis?

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

Answer key

  1. 1. B · Histones
  2. 2. C · Mitochondrion
  3. 3. A · Making ribosomal RNA and assembling ribosome subunits
  4. 4. B · Most amino acids are coded by more than one codon
  5. 5. A · Into the endoplasmic reticulum
  6. 6. D · AUG, coding for methionine
  7. 7. D · Lactose present and glucose absent
  8. 8. B · It stops tubulin polymerising, so the spindle cannot form

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