Cellular Control - exam practice

What is an operon?

Below are three processes that occur within living organisms.

1 - apoptosis

2 - mitosis

3 - meiosis

Which of these processes is/are important in determining the body plan of an organism?

Hox genes contain a homeobox sequence of 180 base pairs.

Two species have a homeobox sequence of 180 base pairs where 1.7% of the base pairs are different.

What is the number of amino acids coded for that would be different in the two species?

When a gene mutation occurs, which of the following may be altered, resulting in the production of a non-functional protein?

1 - amino acid sequence

2 - DNA nucleotide sequence

3 - mRNA nucleotide sequence

How do transcription factors affect the transcription of a gene when they bind to its promoter region?

To what do transcription factors in eukaryotes bind?

What is the function of the product of the regulatory gene in the lac operon?

Which molecule affects the binding of the lac repressor to the operator site?

What is the role of the regulatory gene in the lac operon?

The enzyme β-galactosidase is classified as what type of enzyme?

What happens when lactose is present in the medium where a bacterium capable of digesting lactose is growing?