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

this protocol provides a detailed procedure for co-immunoprecipitation (co-ip) to identify protein–protein interactions.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

a symbiotic relationship with the mitochondria