b) Coordination of expression of genes with related functions is achieved differ

Question

b) Coordination of expression of genes with related functions is achieved differently in eukaryotes and prokaryotes. For both prokaryotic and eukaryotic (6 marks) Prokaryotic Eukaryotic 127 cells, circle either 'yes' or 'no' for each of the statements belovw. cells cells i) Genes with related functions are usually clustered yes/no yes /no i) Each gene has its own promoter ili) Polycistronic RNA is made by transcription iv) Coordination involves control elements & enhancers yes/no yes/ no v) Coordination involves an operator vi) Coordination requires a signal sequence yes no yes no yes /no yes/ no yes / no yes / no yes / no yes/no Page 8 of 13

Explanation / Answer

Prokaryotes Eukaryotes

1. Genes with related functions are usually clustered. Yes No

In eukaryotes, co-expressed genes are typically scattered over different chromosomes.

2. Each gene has its own promoter. No Yes

In eukaryotes, each gene is made on individual mRNAs and each gene has its own promoter.

3. Polycistronic RNA is made by transcription. Yes No

A polycistronic mRNA is a single RNA molecule encodes more than one protein by virtue of containing information from two or more sequential.

4. Coordination involves control elements and enhancers. No Yes

Prokaryotes coordinate expression by using operons and eukaryotes by shared control elements.
-eukaryotes coordinate expression by shared control elements:

5. Coordination involves an operator. Yes No

Eukaryotic cells do not have operator sequences like prokaryotic cells.

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