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 part of the cytoskeleton forms the mitotic spindle?

  1. ACollagen fibres
  2. BIntermediate filaments
  3. CMicrotubules
  4. DActin filaments
2.Easy

What does meiosis produce from one diploid cell?

  1. ATwo genetically different diploid cells
  2. BTwo genetically identical diploid cells
  3. CFour genetically identical haploid cells
  4. DFour genetically different haploid cells
3.Easy

What is the main role of the nucleolus?

  1. ABreaking down damaged proteins that are tagged with ubiquitin
  2. BCopying the whole genome
  3. CMaking ribosomal RNA and assembling ribosome subunits
  4. DStoring ATP for the nucleus
4.Medium

Which cell junction seals neighbouring epithelial cells together and stops fluid leaking between them?

  1. ATight junction
  2. BGap junction
  3. CHemidesmosome
  4. DDesmosome
5.Medium

A codon consists of:

  1. AThree nucleotides on mRNA that code for an amino acid or a stop signal
  2. BOne nucleotide
  3. CA whole gene
  4. DThree amino acids
6.Medium

Why does inserting a single nucleotide into a coding sequence usually have a large effect?

  1. AIt shifts the reading frame of all following codons
  2. BIt stops the gene from being transcribed into messenger RNA
  3. CIt changes the sugar in the DNA backbone
  4. DIt always changes one amino acid only
7.Hard

Non-disjunction during meiosis can result in:

  1. AIdentical twins
  2. BCrossing over
  3. CMitochondrial DNA mutations only, which are passed on through the egg cytoplasm
  4. DGametes with an abnormal number of chromosomes, such as in Down syndrome
8.Hard

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

  1. A46
  2. B23²
  3. C2²³ (about 8 million)
  4. D2 × 23

Answer key

  1. 1. C · Microtubules
  2. 2. D · Four genetically different haploid cells
  3. 3. C · Making ribosomal RNA and assembling ribosome subunits
  4. 4. A · Tight junction
  5. 5. A · Three nucleotides on mRNA that code for an amino acid or a stop signal
  6. 6. A · It shifts the reading frame of all following codons
  7. 7. D · Gametes with an abnormal number of chromosomes, such as in Down syndrome
  8. 8. C · 2²³ (about 8 million)

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