Which is a part of the electron transport chain?   A. ATP   B. cytochrome   C. ATP synthase   D. rubisco

What is the role of protein kinase? A. To remove a phosphate group from ATP to transfer it to a substrate B. To add a phosphate group to ADP to make ATP for substrate activity C. To add a phosphate group directly to the substrate D. None of these

Which theory of aging states that unstable oxygen molecules tend to steal electrons as they bounce around, thus causing damage to surrounding cells? a. cellular-clock theory b. wear-and-tear theory c. free-radical theory d. activity theory

The backbone of DNA molecule is made of?   a. nucleotides   b. alternating phosphates and bases   c. alternating bases and sugars   d. alternating sugar and phosphate molecules