Question

cells make proteins from amino acids. some amino acids can be made in our cells by combining carbon, hydrogen, and oxygen from sugar molecules. but 9 of the 20 common amino acids cannot be synthesized in our cells. these 9 essential amino acids can only be obtained by eating protein - rich foods, like animal meat, eggs, fish, nuts, beans, and dairy products.
select the true statements.

• chemical elements from sugars can be used to make amino acids.
• essential amino acids are made in human body cells.
• all amino acids must be consumed in foods.
• cells combine amino acids to make new proteins.

Explanation:

• For option A: The text says "Some amino acids can be made in our cells by combining carbon, hydrogen, and oxygen from sugar molecules", so this is true.
• For option B: The text states "9 of the 20 common amino acids cannot be synthesized in our cells" (these are essential amino acids), so essential amino acids are not made in human body cells, this is false.
• For option C: The text says some amino acids can be made in cells, so not all must be consumed in foods, this is false.
• For option D: The text says "Cells make proteins from amino acids", and making proteins involves combining amino acids, so this is true.

Answer:

A. Chemical elements from sugars can be used to make amino acids.
D. Cells combine amino acids to make new proteins.