Pepsin, an enzyme found in the stomach, acts best at a ph of about 2, but it is not active at a ph of 7. why

Structures in cells that carry out specific functions.

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.

The image below shows a weather service map. which details best describe this map? check all that apply