The production or break down of __________ is often coupled with the metabolic reactions of biosynthesis and catabolism.
A. aspirin
B. DNA
C. ATP
D. CO2
Cellulose fibers resemble with the protein structure in the form of
A. β-sheets
B. α-helices
C. β-turns
D. None of these
The ultimate source of energy that sustains living systems is
A. glucose
B. oxygen
C. sunlight
D. carbon dioxide