BIOCHEM MIDTERM EXAM. ALL MIDTERM EXAM REVISION QUESTIONS AND CORRECT ANSWERS (GRADED A+) (100% GUARANTEE) (2024 UPDATE)
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Course
Biochemistry
Institution
Biochemistry
Galactose 1-phosphate is initially converted to glucose 1-phosphate and requires which of the
following compounds?
a. Galactose 6-phosphate
b. NADPH
c. Glucose 6-phosphate
d. UDP-glucose - ANSWER- d. UDP-glucose.
A patient presents to the emergency department with lactic acidosis. A deficienc...
BIOCHEM MIDTERM EXAM. ALL MIDTERM EXAM
REVISION QUESTIONS AND CORRECT ANSWERS
(GRADED A+) (100% GUARANTEE) (2024 UPDATE)
Galactose 1-phosphate is initially converted to glucose 1-phosphate and requires which of the
following compounds?
a. Galactose 6-phosphate
b. NADPH
c. Glucose 6-phosphate
d. UDP-glucose - ANSWER- d. UDP-glucose.
A patient presents to the emergency department with lactic acidosis. A deficiency in thiamine
(TPP) is suspected and this will be consistent with a decrease in the activity of which of the
following enzymes?
a. Aldolase B
b. Transketolase
c. Glucose 6-phosphate dehydrogenase
d. Lactate dehydrogenase
e. Pyruvate carboxylase - ANSWER- b. Transketolase
Which of the following is required for transketolase activity?
a. Thiamine diphosphate (TPP)
b. Biotin
c. Pyridoxal phosphate
d. NAD+ - ANSWER- a. Thiamine diphosphate (TPP)
A deficiency in glucose 6-phosphate dehydrogenase reduces the levels of NADPH in the red blood
cell. This leads to an increase in which of the following compounds in the cell?
a. NADH
b. Ribulose 5-phosphate
c. Fructose 6-phosphate
,d. Oxidized glutahione - ANSWER- d. Oxidized glutathione.
In the non-oxidative portion of the pentose phosphate pathway, 2-carbon fragments of keto-sugars
can be transferred to other sugars to generate a larger sugar molecule. This reaction is catalyzed
by which of the following enzymes?
a. Pyruvate carboxylase
b. Debranching enzyme
c. Ribose 5-phosphate isomerase
d. Transketolase
c. Transaldolase - ANSWER- d. Transketolase
The major regulatory step of the pentose phosphate pathway is catalyzed by which enzyme?
a. Glucose 6-phosphate dehydrogenase
b. Transaldolase
c. Phosphofructokinase-1
d. Ribose 5-phosphate isomerase - ANSWER- a. Glucose 6-phosphate dehydrogenase
cAMP elicits multiple cellular responses.
The effect of cAMP on gene transcription are directly mediated by which of the following DNA
binding proteins?
a. Adenylyl cyclase
b. Phosphodiesterase
c. Protein kinase A
d. Cyclic AMP response element binding protein (CREB) - ANSWER- d. Cyclic AMP response
element binding protein (CREB)
What is the primary oxidized fuel for skeletal muscle in the fasted state?
a. Glucose
b. Amino Acids
, c. Ketones
d. Free fatty acids - ANSWER- d. Free fatty acids
Which of the following hormones is best described as anabolic?
a. Cortisol
b. Epinephrine
c. Insulin
d. Glucagon - ANSWER- c. Insulin
PI 4, 5, bisphosphate (PIP2) can be cleaved by phospholipase C to initially generate which of the
following second messengers?
a. Phospatidylinositol (PI) and phosphatidylinositol 3, 4 bisphosphate (PI 3, 4 bisP)
b. Diacylglycerol (DAG) and Inositol 1, 4, 5 tris phosphate (IP3)
c. Diacylglycerol (DAG) and Phospatidylinositol (PI)
d. Inositol 1, 4, 5 tris phosphate (IP3) and phospatidylinositide 3, 4, 5 tris phosphate (PI 3, 4, 5
trisP) - ANSWER- b. Diacylglycerol (DAG) and Inositol 1, 4, 5 tris phosphate (IP3)
Caffeine is a natural inhibitor of phosphodiesterase. If you were to consume a large amount of
coffee you would likely see a prolonged response to which of the following stimulants or
hormones?
a. Insulin
b. Glucose
c. Cortisol
d. Glucagon - ANSWER- d. Glucagon
Which of the following pathways provides the primary oxidizable fuel for skeletal muscle in the
fasted state?
a. Hepatic glycogenolysis
b. Gluconeogenesis
c. Lipolysis from adipose tissue
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