MCQs BIOCHEMISTRY: LIPIDS metabolism

1.
The key enzyme in the regulation of fatty acid synthesis is

A. acetyl CoA carboxylase
B. AMP activated proteinkinase
C. protein phosphatase
D. none of these
Answer & Explanation
Answer: Option A

2.
Arachidonate has 20 carbon atoms with

A. 3 double bonds
B. 2 double bonds
C. 4 double bonds
D. 8 double bonds
Answer & Explanation
Answer: Option C

3.
In the intestine, the dietary fats are hydrolysed by

A. triacylglycerol lipase
B. adenylate cyclase
C. pancreatic lipase
D. protein kinase
Answer & Explanation
Answer: Option B

4.
HDLs are synthesized in

A. blood B. liver
C. intestine D. pancreas
Answer & Explanation
Answer: Option B

5.
Triacylglycerols are

A. soluble in water
B. insoluble in water
C. soluble in water at elevated temperature
D. partially soluble in water
Answer & Explanation
Answer: Option B

6.
Animals cannot convert fatty acids into glucose because

A. acetyl CoA can not be converted to pyruvate
B. absence of malate synthase
C. absence of dehydrogenase
D. absence of a-ketoglutarate dehydrogenase
Answer & Explanation
Answer: Option A

7.
In eukaryotes fatty acid breakdown occurs in

A. mitochondrial matrix
B. cytosol
C. cell membrane
D. endoplasmic reticulum
Answer & Explanation
Answer: Option A

8.
What is the major protein constituent of high-density lipoprotein (HDL)?

A. Apolipoprotein A-l
B. Apolipoprotein C-l
C. Apolipoprotein E
D. None of these
Answer & Explanation
Answer: Option A

9.
Phospholipid contains

A. hydrophilic heads and hydrophobic tails
B. long water-soluble carbon chains
C. positively charged functional groups
D. both (b) and (c)
Answer & Explanation
Answer: Option A

10.
Micelles of fatty acids in water are organized such that the __________ faces the solvent and the __________ are directed toward the interior

A. carboxylic acid groups, hydrocarbon chains heads
B. hydrophilic heads, hydrophobic tails
C. hydrocarbon chains, carboxylic acid groups
D. both (a) and (b)
Answer & Explanation
Answer: Option D

11.
Cholesterolemia means

A. lack of functional LDL receptors
B. lack of functional HDL receptor
C. high sensitivity to fatty food intake
D. none of the above
Answer & Explanation
Answer: Option A

12.
Fatty acids break down of eukaryotes occurs in

A. mitochondrial matrix
B. cell membrane
C. cytosol
D. endoplasmic reticulum
Answer & Explanation
Answer: Option A

13.
VLDLs are synthesized in

A. blood B. liver
C. intestine D. pancreas
Answer & Explanation
Answer: Option B

14.
Chylomicrons are synthesized in

A. blood B. liver
C. intestine D. pancreas
Answer & Explanation
Answer: Option C

15.
How many types of lipoproteins are there?

A. 2 B. 6
C. 8 D. 5
Answer & Explanation
Answer: Option D

16.
Fatty acid synthesis takes place in

A. mitochondria
B. cell membrane
C. cytosol
D. endoplasmic reticulum
Answer & Explanation
Answer: Option C

17.
Cholestrol is the precursor of

A. steroid hormones
B. vitamin A
C. bile salts
D. both (a) and (c)
Answer & Explanation
Answer: Option D

18.
Atherosclerosis can cause blood

A. thinning
B. clotting
C. thickening
D. none of these
Answer & Explanation
Answer: Option B

19.
Palmitate has 16 carbon atoms with

A. 2 double bonds
B. 3 double bonds
C. One double bond
D. None of these
Answer & Explanation
Answer: Option D

20.
How many ATPs are formed during complete oxidation of palmitate?

A. 35 B. 96
C. 129 D. 131
Answer & Explanation
Answer: Option C

21.
The lowest energy value lipid for human nutrition is

A. olive oil
B. olestra
C. margarine
D. cardiolipih
Answer & Explanation
Answer: Option B

22.
How many classes of steroid hormones are there?

A. 3 B. 2
C. 4 D. 5
Answer & Explanation
Answer: Option D

23.
The number of water molecules consumed by the formation of phosphatidyl serine are

A. 0 B. 1
C. 2 D. 4
Answer & Explanation
Answer: Option A