Truuuueeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Answer:
ATP
Explanation:
Adenosine triphosphate, or ATP, is the primary carrier of energy in cells
DNA is a COMBINATION of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base.
Answer:
Active uptake (which I think you mean active transport) is important when the concentration gradient is against that of a certain substance, so it doesn't cross the membrane through diffusion or passive transport. It is sometimes necessary if a substance needs to move across a membrane but can't do so due to electrical charge or that there is a substance on the other side of the membrane preventing diffusion.
Explanation:
