Most Asked Biochem Questions

Question 1

What is the rate limiting enzyme of the PPP?

Answer 1

glucose 6 phosphate DH

Question 2

beta 1,4 bonds are found in?
A) lactose
B) galactose
C) ribose
D) glucose

Answer 2

A) lactose

Question 3

How many ATPs are produced anaerobically?

Answer 3

2

Question 4

Which is a pyrimidine?
A) thymine
B) adenine
C) guanine
D) glucose

Answer 4

A) thymine

Question 5

Which carries the most cholesterol?
A) HDL
B) LDL
C) VLDL
D) chylomicrons

Answer 5

B) LDL

Question 6

Which inhibits gluconeogenesis?
A) ethanol
B) cortisol
C) insulin
D) glucagon

Answer 6

C) insulin

Question 7

The most common way to enter the krebs cycle for AA, FAs, and glucose is?

Answer 7

acetyl CoA

Question 8

Glucose 6 phosphate DH is the rate limiting enzyme of which pathway?

Answer 8

PPP

Question 9

A vegetarian diet is deficient in which vitamins?
A) vit C
B) folic acid
C) pyridoxine
D) cyanocobalamin

Answer 9

D) cyanocobalamin

Question 10

What is produced anaerobically in glycolysis?

Answer 10

ATP

Question 11

Which vitamin deficiencies will cause a neurological reaction?
A) vit A
B) vit C
C) vit B1
D) vit K

Answer 11

C) vit B1

Question 12

Which is the final end product of the hexose monophosphate shunt?
A) pentose sugars and NADPH
B) tryptophan
C) VLDL
D) NADH

Answer 12

A) pentose sugars and NADPH

Question 13

Which takes cholesterol from the liver to the tissues?
A) HDL
B) LDL
C) VLDL
D) ALL

Answer 13

B) LDL

Question 14

Sucrose is made from the combination of ____________ and ____________

Answer 14

glucose, fructose

Question 15

Which of the following is a purine?
A) guanine
B) cytosine
C) thymine
D) uracil

Answer 15

A) guanine

Question 16

Components of NADH and NADPH?
A) biotin
B) tyrosine
C) pyridoxine
D) tryptophan

Answer 16

D) tryptophan

Question 17

Which enzyme starts the process of glycogenolysis?

Answer 17

glycogen phosphorylase

Question 18

Which vitamin makes up CoA?

Answer 18

B5

Question 19

How many nucleic acids make up the codon?

Answer 19

3

Question 20

Which one has the lowest melting point?
A) linolenic acid
B) oleic acid
C) palmitic acid
D) baby oil

Answer 20

A) linolenic acid

Question 21

The reaction which appears to be necessary for the absorption of glucose from the intestine is?

Answer 21

phosphorylation

Question 22

Beri beri is a deficiency of?

Answer 22

B1

Question 23

Fat may be hydrolyzed by all of the following except?
A) acids
B) lipases
C) fat enzymes
D) alkalies

Answer 23

A) acids

Question 24

In liquid water, the strongest bonds between water molecules are?

Answer 24

hydrogen bonds

Question 25

Deficiency of vit B12 causes which kind of anemia? A) microcytic B) macrocytic C) hypochromic D) hyperchromic

Answer 25

B) macrocytic

Question 26

Which is not a part of the urea cycle? A) arginine B) ornithine C) citrulline D) citrate

Answer 26

D) citrate

Question 27

Fasting causes low serum __________ levels A) insulin B) glucagon C) cortisol D) adrenaline

Answer 27

D) adrenaline

Question 28

What element is found in every AA that is not found in FAs?

Answer 28

N

Question 29

The aliphatic chain in FA synthesis is lengthened by condensation of malonyl CoA with the removal of?

Answer 29

CO2

Question 30

If you have a diet of polished rice and low tryptophan, this will lead to ____________ disease due to deficiency of _____________

Answer 30

beri beri, thiamine

Question 31

One turn of the TCA cycle gives you how many CO2 molecules?

Answer 31

2

Question 32

What is the rate limiting enzyme of the urea cycle?

Answer 32

carbomoyl phosphate synthase

Question 33

Vitamins D, E, A, and K are considered to be A) sterols B) water soluble C) proteins D) non toxic

Answer 33

A) sterols

Question 34

One turn of the krebs cycle results in how many NADH and FADH2?

Answer 34

3:1

Question 35

Where is the krebs cycle occurring?

Answer 35

mitochondrial matrix

Question 36

Which is part of the ETC? A) ubiquinone B) vit A C) selenium D) vit D

Answer 36

A) ubiquinone

Question 37

What makes up coenzyme A?

Answer 37

pantothenic acid

Question 38

Which is a cause of pernicious anemia? A) B12 def B) B5 def C) B3 def D) B1 def

Answer 38

A) B12 def

Question 39

What is the rate limiting enzyme of cholesterol synthesis?

Answer 39

HMG CoA reductase

Question 40

Which is deficient in kwashiorkor?

Answer 40

protein

Question 41

Which is an inhibitory neurotransmitter? A) GABA B) glutamate C) aspartate D) ACh

Answer 41

A) GABA

Question 42

If you are fasting for 24 hours, which is increased? A) gluconeogenesis B) glycolysis C) protein synthesis D) fat synthesis

Answer 42

A) gluconeogenesis

Question 43

Peptide bond formation is what type of reaction?

Answer 43

condensation

Question 44

Glycogenolysis is stimulated by ________ blood sugar and ______________

Answer 44

low, glucagon

Question 45

FA synthesis occurs in the?

Answer 45

cytoplasm

Question 46

Glucose is categorized as? A) aldopentose B) aldohexose C) ketopentose D) ketohexose

Answer 46

B) aldohexose

Question 47

Which is a ketone body? A) acetyl CoA B) acetoacetate C) acetate D) pyruvate

Answer 47

B) acetoacetate

Question 48

Which most accurately describes the ability of the binding site and the substrate? A) Michaelis menten B) Bohr effect C) Sid Williams D) Louis Pasteur

Answer 48

A) Michaelis menten

Question 49

Which vitamin is necessary for the formation of acetyl CoA from pyruvate?

Answer 49

thiamine