Cell biology worksheet with answers

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

1. AFatty acids
2. BNucleotides
3. CAmino acids
4. DMonosaccharides

The cell membrane is mainly made of:

1. AStarch
2. BDNA
3. CCellulose
4. DA phospholipid bilayer with proteins

Which type of microscope can resolve the smallest structures, such as ribosomes?

1. AMagnifying glass
2. BLight microscope
3. CDissecting microscope
4. DElectron microscope

What role does cholesterol play in animal cell membranes?

1. AIt helps keep membrane fluidity stable across temperatures
2. BIt forms channels for ions
3. CIt is the main carrier of glucose
4. DIt makes the membrane completely rigid at every temperature

What is the net ATP yield of glycolysis per molecule of glucose?

1. A36 ATP
2. B4 ATP
3. C1 ATP
4. D2 ATP

A codon consists of:

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

Knudson's "two-hit" hypothesis, based on retinoblastoma, explains that tumour suppressor genes:

1. AAre only found in children
2. BAre always inherited in mutated form from both the mother and the father
3. CCause cancer when one allele is overactive
4. DUsually need both alleles to be inactivated before a tumour develops

In Michaelis–Menten kinetics, what does the Km of an enzyme represent?

1. AThe substrate concentration at which the rate is half of Vmax
2. BThe amount of enzyme in the cell
3. CThe maximum rate of the reaction
4. DThe reaction rate when the substrate concentration is close to zero