Which describes a promoter?
a. the first part of an operon that regulates where, when, and to what level a gene is expressed
b. the part of an operon that, if attached by a repressor protein, suppresses the expression of a gene
c. a cluster of genes that are expressed or repressed as a group
d. an enzyme that dna unzip prior to transcription.

Explain how the political influence of african americans leaders became weaker.

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone

Dna. we have heard that we are a product of our dna. but where is it? how do we "get" our dna? it is passed to us, from our parents, but in what form? several vocabulary words associated with inheritance are used interchangeably and sometimes, incorrectly. let's see if you can clear this up for someone just learning about inheritance and cell structure.