Cell biology worksheet with answers

Prokaryotic cells differ from eukaryotic cells because they:

1. AHave no DNA
2. BHave no membrane-bound nucleus
3. CHave no ribosomes
4. DAre always larger

What is the main role of the nucleolus?

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

What does meiosis produce from one diploid cell?

1. AFour genetically different haploid cells
2. BTwo genetically different diploid cells
3. CTwo genetically identical diploid cells
4. DFour genetically identical haploid cells

Where does RNA polymerase bind to start transcription of a gene?

1. AAt the stop codon
2. BAt the terminator
3. CAt the start codon
4. DAt the promoter

Which enzyme unwinds the DNA double helix during replication?

1. ADNA ligase
2. BPrimase
3. CHelicase
4. DDNA polymerase

The contractile ring that pinches an animal cell in two during cytokinesis is made of:

1. AKeratin filaments
2. BCellulose fibres
3. CMicrotubules and kinesin
4. DActin and myosin

Non-disjunction during meiosis can result in:

1. AGametes with an abnormal number of chromosomes, such as in Down syndrome
2. BMitochondrial DNA mutations only, which are passed on through the egg cytoplasm
3. CCrossing over
4. DIdentical twins

A disease is passed from an affected mother to all her children but never from an affected father. Where is the mutation most likely located?

1. AOn the X chromosome, as a dominant trait
2. BOn an autosome, as a recessive trait
3. COn the Y chromosome
4. DIn mitochondrial DNA