Lesson 7: Biosynthetic Pathways Flashcards Preview

Biochemistry Final Exam > Lesson 7: Biosynthetic Pathways > Flashcards

Flashcards in Lesson 7: Biosynthetic Pathways Deck (15):
1

Biosynthesis of fatty acids involves the stepwise additions of how many carbon units at a time?

Select one:
a. 3
b. 2
c. 4
d. it does not involve carbon units
e. 1

b. 2

2

Biosynthetic pathways always generate ATP. True or False?

False

3

Biosynthetic pathways have all of the same regulatory enzymes as catabolic pathway. True or False?

False

4

Gluconeogenesis

Select one:
a. Mostly takes place in the cytoplasm of the cell
b. All of these answers are correct
c. Involves many of the same enzymes as glycolysis
d. Can involve the kidneys during prolonged starvation
e. Primarily occurs in the liver

All of these answers are correct

5

Glucose can be synthesised from

Select one:
a. Oxaloacetate
b. All of these answers are correct
c. Pyruvate
d. Glucogenic amino acids
e. Lactate

All of these answers are correct

6

If a biosynthetic pathways is blocked, the body is sometimes able to use the reverse of the catabolic pathway to make the same compound. True or False?

True

7

Most biosynthetic reactions take place in the cytoplasm. True or False?

True

8

Phosphatidylcholine is a common phospholipid referred to as

Select one:
a. Serine
b. Arginine
c. Leucine
d. Lecithin
e. Fructose

d. Lecithin

9

Red blood cells are particularly dependent on glucose as an energy source. True or False?

True

10

The enzyme involved in the rate-limiting step of cholesterol synthesis is

Select one:
a. None of these answers are correct
b. HMG CoA lyase
c. HMG CoA dehydratase
d. HMG CoA reductase
e. HMG CoA carboxylase

d. HMG CoA reductase

11

The extension of a fatty acid chain occurs through

Select one:
a. Oxidation, Reduction, Oxidation, Condensation
b. Condensation, Reduction, Dehydration, Reduction
c. Saturation, Condensation, Reduction, Reduction
d. Reduction, Reduction, Condensation, Dehydration
e. Condensation, Dehydration, Hydration, Oxidation

b. Condensation, Reduction, Dehydration, Reduction

12

The four rings of cholesterol are formed from the cyclisation of

Select one:
a. Acetyl CoA
b. Squalene
c. Isopentenyl pyrophosphate
d. Farnesyl pyrophosphate
e. Mevalonate

b. Squalene

13

The process by which glucose is synthesised in the body is referred to as

Select one:
a. Glycolysis
b. All of these answers are correct
c. Gluconeogenesis
d. Glycogenesis
e. Glycogenolysis

c. Gluconeogenesis

14

Which of the following is INCORRECT?

Select one:
a. The body only requires the essential amino acids, the others are not required for the synthesis of protein chains
b. The body requires 20 different amino acids to synthesise its protein chains
c. Nonessential amino acids can be synthesized from the intermediates of the citric acid cycle
d. Nonessential amino acids can be synthesized from the intermediates of glycolysis
e. The amino acids that cannot be synthesized and must come from the diet, are referred to as the essential amino acids

a. The body only requires the essential amino acids, the others are not required for the synthesis of protein chains

15

Which of the following statements is INCORRECT

Select one:
a. Nearly all of the acetyl CoA generated from metabolic processes, is formed in the cytoplasm
b. Acetyl CoA is unable to pass through the mitochondrial membrane
c. Acetyl CoA is the carbon source for fatty acid biosynthesis
d. In order for the synthesis of fatty acids to occur acetyl CoA must be moved into the cytosol
e. Acetyl CoA is derived from pyruvate oxidation and the oxidation of fatty acids

a. Nearly all of the acetyl CoA generated from metabolic processes, is formed in the cytoplasm