From which substrate is the first carbon dioxide molecule released during cellular respiration?

a. glucose

b. pyruvate

c. acetyl coa

d. citrate (a c6 intermediate compound in the krebs cycle)

cell regulation is conducted by special proteins.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

and after water is usually warmed by the sun the water temperature raises and then evaporates .

cells spend most of their time in interphase