AL Control of gene expression

State the term for a cluster of genes in a prokaryote controlled by the same promoter

A regulatory gene encodes for which of the following?

• An enzyme

• A repressor protein

• A membrane bound protein

• A hormone

Identify the enzyme that catalyses transcription

Identify the molecule that breaks down DELLA proteins

• Auxin (IAA)

• Lactose

• Gibberellic acid

• trp

Identify the genotype of a plant that does not produce the gibberellins required for stem elongation

• le le

• Tt

• Le Le

• Le le

State the term for the observable features of an organism

An inducible enzyme is only synthesised in which conditions?

• When a repressor protein is synthesised

• Only when its substrate is present

• Only when its substrate is absent

• When a suitable transcription factor is present

The lac repressor protein binds to which of the following structures?

• Structural gene

• Attenuator

• Promoter

• Operator

A repressible enzymes synthesis will be inhibited in which of the following conditions?

• When a transcription factor binds to the operator

• When a substrate is absent

• When an effector molecule binds to the repressor

• When a transcription factor has been activated by a hormone

Which of the following are not found in prokaryotes?

• Transcription factors

• Operators

• Promoters

• RNA polymerases