Lesson 5: Catabolic pathways for carbohydrates and proteins Flashcards Preview

Biochemistry Final Exam > Lesson 5: Catabolic pathways for carbohydrates and proteins > Flashcards

Flashcards in Lesson 5: Catabolic pathways for carbohydrates and proteins Deck (15):
1

Amino acids can be absorbed along the entire length of the small intestine. True or False?

True

2

Amino acids in the body are primarily used to

Select one:
a. Produce energy
b. Produce testosterone
c. Synthesise glucose
d. Form ketone bodies
e. Synthesise new proteins

e. Synthesise new proteins

3

Ammonia

Select one:
a. In high concentrations in the liver may lead to a coma
b. All of these answers are correct
c. Is toxic and must be eliminated from the system
d. Can build up in the liver with liver failure
e. Is converted to urea through the urea cycle

b. All of these answers are correct

4

Carbohydrates must be broken down into their monosaccharide constituents (and a small number of remaining disaccharides), before they are able to be absorbed by intestinal mucosal cells. True or False?

True

5

Frome one glucose molecule, glycolysis will produce

Select one:
a. 4 pyruvate
b. 30 pyruvate
c. 3 pyruvate
d. 1 pyruvate
e. 2 pyruvate

e. 2 pyruvate

6

Humans excrete nitrogen in the form of ammonia. True or False?

False

7

Pyruvate is generally converted to lactate in aerobic metabolism. True or False?

False

8

Step 1 of glycolysis

Select one:
a. All of these answers are correct
b. Involves the conversion of glucose to glucose-6-phosphate
c. Requires magnesium and ATP for the reaction to occur
d. Is negatively regulated by glucose-6-phosphate
e. Is a phosphorylation reaction

a. All of these answers are correct

9

The pathway that breaks down glucose in order to generate energy, is referred to as

Select one:
a. Gluconeogenesis
b. Transamination
c. Glycolysis
d. Deamination
e. Beta oxidation

c. Glycolysis

10

The transfer of an amino group from one amino acid to an amino acid carbon skeleton is called

Select one:
a. Beta oxidation
b. Glycolysis
c. Transamination
d. Deamination
e. The urea cycle

c. Transamination

11

Under aerobic conditions pyruvate is converted to acetyl CoA in order to enter the citric acid cycle. True or False?

True

12

What is the net yield of ATP in the conversion of glucose to pyruvate (during glycolysis only)?

Select one:
a. 4
b. None
c. 2
d. 30
e. 1

c. 2

13

What is the other term for the carbon skeleton of an amino acid?

Select one:
a. Ketogenic amino acid
b. α-ketoacid
c. Glucogenic amino acid
d. Urea
e. Ammonia

b. α-ketoacid

14

Which of the following is INCORRECT regarding aminotransferases?

Select one:
a. Liver damage can lead to higher than normal concentrations in the blood
b. They catalyse deamination reactions
c. ALT and AST are two of the most active aminotransferases
d. They typically require a form of vitamin B6 as a coenzyme
e. They catalyse transamination reactions

b. They catalyse deamination reactions

15

Which steps of glycolysis require the investment of ATP for reactions to occur?

Select one:
a. 1 and 3
b. 5 and 9
c. 8 and 10
d. 6 and 8
e. All steps in glycolysis require ATP for the reaction to occur

a. 1 and 3