Biology Answers

2.2) Distinguish between heterochromatin and euchromatin.

2.2) Explain how the DNA lagging strand is synthesised especially when DNA polymerase adds nucleotides only to the 3´ end. Include a fully labelled diagram in your answer to show how this strand is synthesised

2.2) Draw a simple structure to illustrate a nucleotide and clearly indicate the 3´, 5´ ends on the sugar where the phosphodiester linkage would form.

2.2) Name each protein involved in the replication of DNA and state its function.

2.2) Provide the names of the different types of histone proteins.

2.2) List the components of chromatin

1.6) The reaction centre pigment in plant photosystem II is

1. P₂
2. P₁₂₀
3. P₆₈₀
4. P₇₀₀
5. P₈₇₀

1.6) When comparing the light reaction with the Calvin cycle of photosynthesis in plants which phase requires Carbon dioxide?

1. Both the light reactions and the Calvin cycle.
2. The stoma of a leaf requires carbon dioxide.
3. The Calvin cycle alone
4. Light reactions alone
5. Neither the light reactions nor the Calvin cycle.

1.6) In comparing the light reaction with the Calvin cycle of photosynthesis in plants which phase requires ATP?

1. Neither the light reactions nor the Calvin cycle
2. Light reaction alone
3. Occurs in the chloroplast but is not part of photosynthesis
4. The Calvin cycle alone
5. Both the light reactions and the Calvin cycle

1.6) In comparing the light reaction with the Calvin cycle of photosynthesis in plants which  of them produces NADPH?

1. Neither the light reactions nor the Calvin cycle
2. Light reaction alone
3. Occurs in the chloroplast but is not part of photosynthesis
4. The Calvin cycle alone
5. Both the light reactions and the Calvin cycle