Question

1. Which of the following is not true of amino acids? a) Your intestines do not absorb proteins, only the amino acids released by hydrolysis of these proteins. b) A normal, natural, unprocessed diet does not contain proteins, only the free amino acids. c) Amino acids are NEEDED for making your proteins. d) Amino acids are NEEDED for making the nitrogenous bases of your nucleic acids. e) In you, amino acids are not stored as protein. 2. Which of the following is true of amino acids? a) You need amino acids to make fats. b) You may use amino acids to make fats. c) You may use the carbon skeletons of some amino acids to make carbohydrates. d) You may use the carbon skeletons of all amino acids to make carbohydrates. e) You may use all the carbons skeletons of all amino acids to make fats. 3. Which of the following is true of amino acids in you? a) All the carbons of all amino acids may be used to make carbohydrates. b) All the carbons of some amino acids may be used to make carbohydrates, but not fatty acids. c) All the carbons of some amino acids may be used to make fatty acids, but not carbohydrates. d) All the carbons of all amino acids may be used to make fatty acids, but not carbohydrates. e) All the carbons of all amino acids may be used to make carbohydrates, but not fatty acids. 4. Consider the correct answer above. What percentage of the normal 20 amino acids correctly fit that bill? a) 10% b) 20% c) 50% d) 60% e) 100%

Answer 1

Answer 1:

The statement that is not true of amino acids is, e) In you, amino acids are not stored as protein. Most of the amino acids in our body are stored as protein. Amino acids are the building blocks of protein molecules.

a) Option is correct because intestines can absorb only smaller molecules and whole proteins are not absorbed. It only absorbs the amino acdis released by hydrolysis of these proteins.

b) Option is incorrect as in all cases of the normal, natural, unprocessed diet free amino acids may or may not be present and whole protein molecules are be present.

c) Option is correct as amino acids are the building blocks of protein molecule.

d) Option is correct as many amino acids are the precursors of purine and pyrimidine bases.

Answer 2:

Option d) is correct – You may use the carbon skeletons of all amino acids to make carbohydrates. Amino acids make fats so options a) and b) are correct. Option c) is incorrect as the carbon skeletons of all amino acids may make carbohydrates. Option e) is correct as all the carbons skeletons of all amino acids may directly make fats.

Answer 3: Option a) is correct - All the carbons of all amino acids may be used to make carbohydrates. All the carbons of all amino acids may be used to make both carbohydrates and fatty acids, hence, option b), c), d) and e) are incorrect.

Answer 4: 100% of the normal 20 amino acids correctly fit that bill.