1.2.M - Lesson: Amino Acids

Question 1

All proteins contain a combination of __________ unique amino acids, and they are classified based on the number of amino acids in the particular chain.

Answer 1

Twenty

Question 2

A(n) __________ amino acid is one that is needed in the diet because it cannot be made in the body or cannot be made in adequate quantities for sustaining the body’s needs.

Answer 2

Essential

Question 3

__________ amino acids are those amino acids that do not need to be obtained from the diet because the body is capable of synthesizing (producing) them.

Answer 3

Nonessential

Question 4

Proteins are like carbohydrates and fats (lipids) in that they all contain carbon, hydrogen, and oxygen. On the other hand, proteins also contain __________ (while carbohydrates and fats do not).

Answer 4

Nitrogen

Question 5

There are ten amino acids that are essential for adolescents. One of those is not required for adults. Which of the following is not required for adults?

Answer 5

Arginine

Question 6

There are ten amino acids that are essential for adolescents. Which of the following is NOT one of those?

Answer 6

Asparagine

Question 7

Which of the following amino acids is/are normally considered nonessential? (Select all that apply.)

Glutamate
Leucine
Phenylalanine
Histidine
Aspartate
Alanine
Asparagine
Serine

Answer 7

Glutamate
Aspartate
Alanine
Asparagine
Serine

Question 8

If an amino acid chain has fewer than fifty amino acids, it is called a __________ (and this is also called a protein).

Answer 8

Peptide

Question 9

When three amino acids are joined, it is called a __________.

Answer 9

Tripeptide

Question 10

Some of the nonessential amino acids become __________ amino acids. This happens when the body cannot produce those amino acids because of an illness or because the body does not have the enzymes needed for synthesizing those amino acids. When this happens, those amino acids must be consumed in foods.

Answer 10

Conditional