Cell biology worksheet with answers

In which phase of the cell cycle is DNA replicated?

1. AS phase
2. BG1 phase
3. CG2 phase
4. DM phase

Osmosis is the movement of:

1. AAny molecule across a membrane from high to low concentration, without using energy
2. BProteins into the nucleus
3. CWater across a semi-permeable membrane from lower to higher solute concentration
4. DIons using ATP

What are the building blocks (monomers) of DNA called?

1. ANucleotides
2. BFatty acids
3. CMonosaccharides
4. DAmino acids

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

1. APrimary active transport
2. BFacilitated diffusion
3. CSimple diffusion
4. DSecondary active transport

Where in the cell does the citric acid (Krebs) cycle take place?

1. ACytoplasm
2. BIntermembrane space
3. CMitochondrial matrix
4. DInner mitochondrial membrane

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

1. AMicrotubules and kinesin
2. BCellulose fibres
3. CActin and myosin
4. DKeratin filaments

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

1. AMore unsaturated fatty acids
2. BMore saturated fatty acids
3. CFewer membrane proteins
4. DLonger fatty acid tails

A signal molecule that cannot cross the membrane, such as adrenaline, acts by:

1. ADissolving the membrane
2. BBinding a surface receptor that triggers a second-messenger cascade
3. CDiffusing into the nucleus and binding DNA to change gene transcription
4. DBeing converted into ATP