Which of the following best describes the main role of the electron transport chain in cellular respiration
a)it produces molecules of ATP
b)it pumps hydrogen ions inside the cell
c)it breaks down glucose molecules
d)it produces the energy it carries

The correct answer is option (A) it produces molecules of ATP.

Explanation: The main role of the electron transport chain in cellular respiration is that it produces ATP molecules. Adenine tri phosphate (ATP) is a molecule of energy which is produced during oxidation reduction reaction. This energy is used in most of the chemical reaction that is occur inside the cell.

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.