Question

what type of molecule is atp?
a a structural carbohydrate
b a type of protein enzyme
c a fatty acid used for energy storage
d a high - energy molecule used for cellular work
question 20
how is atp most directly produced in cells?
a by breaking down dna molecules in the nucleus
b by linking amino acids during protein synthesis
c by adding a phosphate group to adp during cellular respiration
d by absorbing sunlight in chloroplast membranes

Explanation:

• Question 19: ATP (adenosine triphosphate) is known as the energy currency of the cell. Structural carbohydrates like cellulose are for structural support. Proteins are made of amino acids and have various functions like catalysis (enzymes), but ATP is not a protein. Fatty acids are part of lipids and used for long - term energy storage. ATP is a high - energy molecule that releases energy when its phosphate bonds are broken, which is used for cellular work.
• Question 20: DNA breakdown in the nucleus is mainly for processes like replication and transcription, not ATP production. Linking amino acids is protein synthesis. Absorbing sunlight in chloroplasts is part of photosynthesis (light - dependent reactions) which can produce ATP in plants, but the most direct and common way in most cells (including non - plant cells) is through cellular respiration. In cellular respiration, ADP (adenosine diphosphate) gains a phosphate group to form ATP.

Answer:

• Question 19: d. A high - energy molecule used for cellular work
• Question 20: c. By adding a phosphate group to ADP during cellular respiration