Question

question 3 (1 point)
what functional groups are found on all amino acids?
carbonyl and sulfhydryl
amine and carboxyl
carboxyl and hydroxyl
amine and sulfhydryl
question 4 (1 point)
a dehydration synthesis reaction involves which of the following?
the formation of large molecules with the removal of water.
the breakdown of large molecules with the addition of water.
the breakdown of large molecules with the removal of water.
the formation of large molecules with the addition of water.

Explanation:

• Question 3: Amino acids have a general formula \(R - CH(NH_2)-COOH\). The \(-NH_2\) (amine) and \(-COOH\) (carboxyl) groups are present in all amino acids. Sulfhydryl (\(-SH\)) is present in some amino acids (e.g., cysteine), hydroxyl (\(-OH\)) in others (e.g., serine), and carbonyl (\(C = O\)) is not a fundamental group in the basic amino - acid structure.
• Question 4: Dehydration synthesis is a reaction where two smaller molecules combine to form a larger molecule, and a water molecule is removed in the process. For example, in the formation of a peptide bond between two amino acids (\(H_2N - CHR - COOH+H_2N - CHR'-COOH

ightarrow H_2N - CHR - CONH - CHR'-COOH + H_2O\)), a water molecule is lost as the two amino acids are joined. Hydrolysis is the opposite (breakdown of large molecules with the addition of water).

Answer:

• Question 3: amine and carboxyl
• Question 4: The formation of large molecules with the removal of water.