Cell biology worksheet with answers

How do enzymes speed up chemical reactions?

1. AThey raise the temperature of the cell
2. BThey lower the activation energy
3. CThey change the reaction's final equilibrium
4. DThey are used up in the reaction

Which sugar is found in DNA?

1. ARibose
2. BGlucose
3. CFructose
4. DDeoxyribose

Which organelle carries out photosynthesis?

1. AChloroplast
2. BGolgi apparatus
3. CNucleus
4. DMitochondrion

Gut epithelial cells take up glucose against its gradient with a sodium–glucose cotransporter. What kind of transport is this?

1. AFacilitated diffusion
2. BPrimary active transport
3. CSimple diffusion
4. DSecondary active transport

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

1. AUGA, coding for methionine
2. BUAA, coding for leucine
3. CAUG, coding for glycine
4. DAUG, coding for methionine

Which cell junction lets ions and small molecules pass directly between neighbouring cells?

1. AAdherens junction
2. BGap junction
3. CTight junction
4. DDesmosome

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 the Y chromosome
3. CIn mitochondrial DNA
4. DOn an autosome, as a recessive trait

Bacteria moved to a much colder environment change the fatty acids in their membranes. Which change keeps the membrane fluid?

1. ALonger fatty acid tails
2. BMore unsaturated fatty acids
3. CMore saturated fatty acids
4. DFewer membrane proteins