Ecology

MCQ about lipid metabolism
1_What is the net ATP production for the complete degradation of a C20 fatty acid molecule to CO2 and H2O?

a.134

b.148

c.162

d.176
Answer :a

2_Which of the following statements concerning "fuel usage" in the human body is incorrect?

a.Skeletal muscle in a resting state uses glucose.

b.Cardiac muscle depends first on fatty acids and secondarily on ketone bodies.

c.Brain function is maintained primarily by glucose.

d.The liver uses fatty acids as the primary fuel.

ANSWER :A

3_Which of the following step is incorrect to the formation of ketone bodies?
a) Formation of Acetoacetyl CoA catalyzed by thiolase
b) Formation of HMG CoA catalyzed by HMG CoA synthase 
c) Splitting of HMG CoA to acetyl CoA and acetoacetate catalyzed by HMG CoA lyase
d) Reduction of acetoacetate to 3-hydroxybutyrate catalyzed by lactase

ANSWER :d

4_Lipogenesis can be used to convert glucose to fatty acid via:

a) Acetyl CoA
b) Propionyl CoA
c) Succinyl CoA
d) Acetoacetyl CoA
Answer :A

5_The amount of cholesterol that the body synthesizes every day from acetyl CoA units is :
A_0.3
B_1.6-3.0
C_1.5 - 2.0
D_4-6
E- non above
Answer :c

6_Which of these incorrect about acety coA :
A_Acetyl CoA is the primary link between lipid and carbohydrate metabolism.
B_Acetyl CoA is the degradation product for glucose, glycerol, and fatty acids,
C_acetyl CoA the starting material for the biosynthesis of fatty acids,
cholesterol, and ketone bodies.
D_acetyl CoA catalyzes the adenosine triphosphate dependent formation of a thioester bond between a fatty acid and coenzyme.
Answer :d

7_Acetyl CoA serves as the precursor for the synthesis of cholesterol, and the biosynthesis of cholesterol is tightly regulated.
Which of the following step is a regulatory step of cholesterol biosynthesis?
a) Formation 3-hydroxy-3-methylglutaryl COA
b) Formation of Mevalonate
c) Formation of Isoprenoid Unit
d) Formation of Lansterol
Answer :b

8_The enzyme that regulates the biosynthesis of cholesterol also serves as the druggable target for the reduction of hypercholesterolemia (increase blood cholesterol).
Identify the regulatory enzyme from the following options:
a) HMG-CoA synthase
b) HMG- CoA reductase
c) Lansterol oxidase
d) Cholesterol synthase
Answer :b

9_Which of the following enzyme is responsible for the conversion of cholesterol to cholesterol ester inside the cells?
a) Lecithin Cholesterol Acyl Transferase
b) Acyl CoA Cholesterol Acyl Transferase
c) Cholesterol Esterase
d) None of the Above
Answer :b

10_Which of the following is an essential fatty acid?
a) Linolenic acid
b) Arachidonic acid
c) Oleic acid
d) Palmitic acid
Answer :a

اسالة اضافية عن البايوكمستري
من محمد علي حسين رشك مشكور ♥️

Pharmacology