Biochem 1430 Self Check Questions With Well Elaborated Answers
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Course
Biochem
Institution
Biochem
Snake venom's poison is actually:
a) A collection of digestive enzymes
b) Repertory toxins
c) Paralysis toxins and red blood cell poisons
d) All of the above
e) None of the above - Correct Answer a) A collection of digestive enzymes.
Pepsin requires ____________ to become active.
a) Low ...
Digestion of which of the following involves hydrolases?
a) Carbohydrates
b) Triacylglycerols
c) Proteins
d) All of the above
,e) A and C only - Correct Answer d) All of the above.
Which of the following enzymes activates trypsin?
a) Pepsin
b) Enteropeptidase
c) Zymogenase
d) Carboxypeptidase
e) Trypsinase - Correct Answer b) Enteropeptidase.
Complex carbohydrates are absorbed:
A) As starch or glycogen.
B) As short 4-glucose residues.
C) As acetyl CoA.
D) After the digestion of α 1,6 bonds by α amylase.
E) As glucose and simple sugars. - Correct Answer e) As glucose and simple sugars.
The result of lipase activity in digestion is:
A) Chymotrypsinogen cleavage.
B) Hydrolysis of membrane proteins.
C) Bile salt formation.
D) Emulsion formation.
E) Monoacylgycerol and two free fatty acids. - Correct Answer e) Monoacyglycerol and two free fatty
acids.
Digestion is:
A) Creating energy from foodstuff.
B) A pathway activated by steroid hormones.
C) The process of breaking down large molecules in food.
D) The set of reactions that degrade small molecules into a few simple units.
,E) The salvage of metabolic intermediates. - Correct Answer c) The process of breaking down large
molecules in food.
What does the pancreas release to buffer the pH of the stomach juices?
A) NaHCO3
B) Pepsin
C) ATPase activating protein
D) HCl
E) A strong base to counter the strong acid - Correct Answer a) NaHCO3
A digestible proton pump inhibitor would likely have the following effect:
A) Pepsin activation.
B) Decreasing levels of bile salts.
C) Undigested protein.
D) Loss of ATP production.
E) Nucleic acid hydrolysis. - Correct Answer c) Undigested protein.
The transport of lipids in the lymph is carried out by:
A) Lipases.
B) Micelles.
C) Cholesterol bile salt binding.
D) Chylomicrons.
E) None of the above. - Correct Answer d) Chylomicrons.
What is the advantage in synthesizing enzymes as zymogens?
A) Diet pills can be designed to inhibit zymogen hydrolysis.
B) Zymogens can be stored for rapid release when needed.
C) Depending on the zymogen, it can be activated by the low pH in the stomach or the high pH in the
intestine.
, D) Zymogens are resistant to inactivation by kinases.
E) It allows them to be packaged in chyomicrons more easily. - Correct Answer b) Zymogens can be
stored for rapid release when needed.
All of the following are pancreatic proteases except:
A) Carboxypeptidase.
B) Chymotrypsin.
C) Pepsin.
D) Trypsin.
E) Elastase. - Correct Answer c) Pepsin.
Glucose transport into intestinal epithelial cells takes place by:
A) Active transport using sodium gradient.
B) Active transport using ATP as the energy source.
C) Passive transport using the glucose gradient.
D) Secondary active transport using potassium gradient.
E) Secondary active transport using the sodium glucose cotransporter. - Correct Answer e) Secondary
active transport using the sodium glucose cotransporter.
Some of the mechanisms by which enzyme catalytic activity is controlled are:
A) Allosteric control.
B) Feedback inhibition.
C) Covalent modification .
D) A and C.
E) A, B, and C. - Correct Answer e) A, B, and C.
This energy source is used to regenerate ATP from ADP and Pi.
A) Oxidation of carbon to CO2
B) Electrochemical potential of stored glycogen
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