External cell membranes function to
a. create a surface for chemical reactions
b. produce atp
c. join cells together
d. protect the cells internal environment

Although there are a limited number of amino acids many different types of proteins exist because..

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

What is a gene ? a) a section of a protein that codes for dna. b) the alternate version of a trait. c) the visible trait in the f1 generation. d) a section of dna that codes for a specific trait .