AP Bio Chapter 15 Comprehension Questions

Front

Operon model explains:

Back

Coordinated control of gene expression in bacteria.

Front

Tryptophan present: E. coli doesn't synthesize it. What happens without tryptophan?

Back

Repressor is inactive; RNA polymerase moves through the operator.

Front

E. coli cells with a mutation in the lac operon cannot metabolize lactose if there is a mutation in lacZ (b-galactosidase gene).

Back

mutation in lacZ (b-galactosidase gene)

Front

Eukaryotic gene coding for 3 related proteins could be due to:

Back

alternative RNA splicing

Front

Pair the terms: promoter, operator, RNA polymerase, repressor protein.

Back

RNA polymerase with promoter; repressor protein with operator.

Front

E. coli with inactive trp repressor:

Back

It always synthesizes tryptophan.

Front

In normal E. coli, when is the lac operon ON?

Back

glucose absent, lactose present

Front

E. coli with a mutated lac operator can't bind the lac repressor. When is the lac operon ON?

Back

when glucose levels are low

Front

Histone de-acetylases (HDACs) remove acetyl groups from histones. Their effect on transcription is to:

Back

repress transcription by condensing chromatin

Front

Myosin gene expression in muscle cells vs. neurons.

Back

Muscle cells express an activator protein that binds the myosin enhancer.