E2: Amino Acids

Question 1

Proteins are polymers of amino acids linked together by a peptide bond. A long chain of amino acids formed this way is called a

Answer 1

polypeptide

Question 2

There are about 300 amino acids occur in nature, how many of them are used to synthesize proteins?

Answer 2

20

Question 3

The key elements of amino acids are

Answer 3

Carbon
Hydrogen
Oxygen
Nitrogen

Question 4

Amino acids are group of organic compounds containing two functional groups:

Answer 4

amino and carboxyl group

Question 5

The amino acid is
The carboxyl group is

Answer 5

basic
acidic

Question 6

What is the main function of amino acids

Answer 6

serve as a building block of protein

Question 7

Circulatory function of amino acids

Answer 7

blood clotting control through protein such as fibrinogen

Question 8

Structural functions of amino acids

Answer 8

skeleton, muscle, skin, and generally all tissues of body are made up of proteins

Question 9

Motion function of amino acids

Answer 9

make a locomotory movement through muscle fibers

Question 10

Hormonal function of amino acids

Answer 10

all hormones are formed by amino acid

Question 11

Transport function

Answer 11

albumin is very abundant protein in the blood

Question 12

6 classifications of amino acids

Answer 12

location of amino group
acidity
whether containing phenyl group
occurrence in protein
polarity of R group
nutrient value to human

Question 13

Absorption of amino acids takes place by

Answer 13

active transport in the brush border membrane of the small intestine

Question 14

there are two active transport systems

Answer 14

one for neutral amino acids and one for basic amino acids

Question 15

the amino acid during absorption moves across the intestinal cell membrane against a concentration gradient, requiring

Answer 15

energy supplied by cellular metabolism

Question 16

naturally occurring L forms of amino acids are absorbed preferentially to the

Answer 16

D forms

Question 17

a high concentration of leucine in the diet increases the requirement for

Answer 17

isoleucine

Question 18

Arginine, cystine, and ornithine inhibit

Answer 18

lysine transport

Question 19

Arginine, lysine, and ornithine inhibit

Answer 19

cystine transport