Question

how to do these two question？

Describe the structure and function of an ATP molecule and explain why it is so valuable to a cell. Include a diagram or sketch ( 16) Identify and explain two ways in which the electron transport system in photosynthesis and cellular respiration are different ( T 74)

Answer 1

Structure of ATP

ATP consists of an adenine attached by the 9-nitrogen atom to the 1′ carbon atom of a sugar (ribose), which in turn is attached at the 5' carbon atom of the sugar to a triphosphate group. In its many reactions related to metabolism, the adenine and sugar groups remain unchanged, but the triphosphate is converted to di- and monophosphate, giving respectively the derivatives ADP and AMP. The three phosphoryl groups are referred to as the alpha (α), beta (β), and, for the terminal phosphate, gamma (γ).

Structure 87 ATP Adenocive striphosphate HO-Pop -- 674 OH OH

Functions:

Intracellular signalling

DNA and RNA synthesis

Aminoacid activation in protein synthesis

ATP binding casette transporter

Extracellular Signalling and neurotransmission

Protein solubility

• It is said to be very important because it transports the energy necessary for all cellular metabolic activities. It is dubbed as the universal unit of energy for living organisms.It takes the chemical energy from our food and makes it available for useful work. It's the main molecule supplying the energy that cells need to carry out their day-to-day business.

2.The difference is that in photosynthesis the electrons are moving due to the energy input of light while in cellular respiration the electrons were lent to the ETC by the NADH. Another difference is that in photosynthesis the primary electron acceptor is NADPH and in cellular respiration it is oxygen.