Author: Anonymous

An operon is controlled by a repressor. When the repressor binds to a small molecule, it is does not bind to the DNA near the operon. The operon is never expressed if a mutation prevents the repressor from binding to the small molecule. The type of control illustrated is:

A mutant E. coli strain (that grown under normal conditions induces the lac operon) produces particularly high amounts of ß-galactosidase where lac Z gene encodes for ß-galactosidase. What is a possible genotype of the cells?

A promoter that affects only genes that are on the same piece of DNA is referred to as a(n) _____-acting promoter

Insulators can block the effects of 

In photosynthesis, the Calvin Cycle needs ATP and NADPH to work.

Proteins that affect the structure of DNA bound to histones without altering histone chemical structure (ie. sliding the histones along the DNA) are called:

Which of the following DNA-binding motifs are composed of two alpha helices?

What would happen to the lac operon in the absence of allolactose?

Which molecule(s) has(have) an sp3 central atom? You may select more than one.

A eukaryotic DNA sequence that affects transcription at distant promoters is called a(n):