Most Asked Biochem Questions Flashcards
What is the rate limiting enzyme of the PPP?
glucose 6 phosphate DH
beta 1,4 bonds are found in?
A) lactose
B) galactose
C) ribose
D) glucose
A) lactose
How many ATPs are produced anaerobically?
2
Which is a pyrimidine?
A) thymine
B) adenine
C) guanine
D) glucose
A) thymine
Which carries the most cholesterol?
A) HDL
B) LDL
C) VLDL
D) chylomicrons
B) LDL
Which inhibits gluconeogenesis?
A) ethanol
B) cortisol
C) insulin
D) glucagon
C) insulin
The most common way to enter the krebs cycle for AA, FAs, and glucose is?
acetyl CoA
Glucose 6 phosphate DH is the rate limiting enzyme of which pathway?
PPP
A vegetarian diet is deficient in which vitamins?
A) vit C
B) folic acid
C) pyridoxine
D) cyanocobalamin
D) cyanocobalamin
What is produced anaerobically in glycolysis?
ATP
Which vitamin deficiencies will cause a neurological reaction?
A) vit A
B) vit C
C) vit B1
D) vit K
C) vit B1
Which is the final end product of the hexose monophosphate shunt?
A) pentose sugars and NADPH
B) tryptophan
C) VLDL
D) NADH
A) pentose sugars and NADPH
Which takes cholesterol from the liver to the tissues?
A) HDL
B) LDL
C) VLDL
D) ALL
B) LDL
Sucrose is made from the combination of ____________ and ____________
glucose, fructose
Which of the following is a purine?
A) guanine
B) cytosine
C) thymine
D) uracil
A) guanine
Components of NADH and NADPH?
A) biotin
B) tyrosine
C) pyridoxine
D) tryptophan
D) tryptophan
Which enzyme starts the process of glycogenolysis?
glycogen phosphorylase
Which vitamin makes up CoA?
B5
How many nucleic acids make up the codon?
3
Which one has the lowest melting point?
A) linolenic acid
B) oleic acid
C) palmitic acid
D) baby oil
A) linolenic acid
The reaction which appears to be necessary for the absorption of glucose from the intestine is?
phosphorylation
Beri beri is a deficiency of?
B1
Fat may be hydrolyzed by all of the following except?
A) acids
B) lipases
C) fat enzymes
D) alkalies
A) acids
In liquid water, the strongest bonds between water molecules are?
hydrogen bonds
Which of the following reactions is catalyzed by amylopsin amylase?
starch to maltose
Deficiency of vit B12 causes which kind of anemia?
A) microcytic
B) macrocytic
C) hypochromic
D) hyperchromic
B) macrocytic
Which is not a part of the urea cycle?
A) arginine
B) ornithine
C) citrulline
D) citrate
D) citrate
Fasting causes low serum __________ levels
A) insulin
B) glucagon
C) cortisol
D) adrenaline
D) adrenaline
What element is found in every AA that is not found in FAs?
N
The aliphatic chain in FA synthesis is lengthened by condensation of malonyl CoA with the removal of?
CO2
If you have a diet of polished rice and low tryptophan, this will lead to ____________ disease due to deficiency of _____________
beri beri, thiamine
One turn of the TCA cycle gives you how many CO2 molecules?
2
What is the rate limiting enzyme of the urea cycle?
carbomoyl phosphate synthase
Vitamins D, E, A, and K are considered to be
A) sterols
B) water soluble
C) proteins
D) non toxic
A) sterols
One turn of the krebs cycle results in how many NADH and FADH2?
3:1
Where is the krebs cycle occurring?
mitochondrial matrix
Which is part of the ETC?
A) ubiquinone
B) vit A
C) selenium
D) vit D
A) ubiquinone
What makes up coenzyme A?
pantothenic acid
Which is a cause of pernicious anemia?
A) B12 def
B) B5 def
C) B3 def
D) B1 def
A) B12 def
What is the rate limiting enzyme of cholesterol synthesis?
HMG CoA reductase
Which is deficient in kwashiorkor?
protein
Which is an inhibitory neurotransmitter?
A) GABA
B) glutamate
C) aspartate
D) ACh
A) GABA
If you are fasting for 24 hours, which is increased?
A) gluconeogenesis
B) glycolysis
C) protein synthesis
D) fat synthesis
A) gluconeogenesis
Peptide bond formation is what type of reaction?
condensation
Glycogenolysis is stimulated by ________ blood sugar and ______________
low, glucagon
FA synthesis occurs in the?
cytoplasm
Glucose is categorized as?
A) aldopentose
B) aldohexose
C) ketopentose
D) ketohexose
B) aldohexose
Which is a ketone body?
A) acetyl CoA
B) acetoacetate
C) acetate
D) pyruvate
B) acetoacetate
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
A) Michaelis menten
Which vitamin is necessary for the formation of acetyl CoA from pyruvate?
thiamine
