Forwarded from Dr. Shaimaa MCQ
The enzyme ---------------- remove phosphate from phosphatidate to form 1,2-diacylglycerol
Anonymous Quiz
55%
phosphatidate phosphohydrolase (phosphatidate phosphatase (PAP))
11%
glycerol-3-phosphate acyltransferase
12%
1-acylglycerol-3-phosphate acyltransferase
17%
diacylglycerol acyltransferase (DGAT)
5%
monoacylglycerol acyltransferase
Forwarded from Dr. Shaimaa MCQ
In intestinal mucosa, ---------------- converts monoacylglycerol to 1,2-diacylglycerol in the monoacylglycerol pathway.
Anonymous Quiz
14%
phosphatidate phosphohydrolase
8%
glycerol-3-phosphate acyltransferase
13%
1-acylglycerol-3-phosphate acyltransferase
18%
diacylglycerol acyltransferase (DGAT)
48%
monoacylglycerol acyltransferase
Forwarded from Dr. Shaimaa MCQ
In the biosynthesis of phosphatidylcholine and phosphatidylethanolamine, choline or ethanolamine must first be activated by phosphorylation by ------ followed by linkage to CDP.
Anonymous Quiz
16%
GTP
8%
ADP
26%
CTP
8%
AMP
41%
ATP
Forwarded from Dr. Shaimaa MCQ
CDP-choline or CDP-ethanolamine reacts with ------------------- to form either phosphatidylcholine or phosphatidylethanolamine, respectively
Anonymous Quiz
44%
1,2-diacylglycerol
8%
triacylglycerol
35%
1,2-diacylglycerol phosphate
6%
monoacylglycerol
7%
monoacylglycerol phosphate
Forwarded from Dr. Shaimaa MCQ
Phosphatidylserine is formed from ------------------ directly by reaction with serine
Anonymous Quiz
7%
Plasmalogen
8%
Cardiolipin
19%
Phosphatidate
51%
phosphatidylethanolamine
14%
Phosphatidylserine
Forwarded from Dr. Shaimaa MCQ
--------------- may re-form phosphatidylethanolamine by decarboxylation.
Anonymous Quiz
8%
Triacylglycerols
16%
Phosphatidylcholine
62%
Phosphatidylserine
6%
Cardiolipin
8%
Plasmalogens, PAF
Forwarded from Dr. Shaimaa MCQ
An alternative pathway in liver enables phosphatidylethanolamine to give rise directly to ----------- by progressive methylation of the ethanolamine residue.
Anonymous Quiz
7%
Plasmalogens
8%
Cardiolipin
12%
Phosphatidate
47%
phosphatidylcholine
26%
Phosphatidylserine
Forwarded from Dr. Shaimaa MCQ
---------------- catalyzes the only step specific for triacylglycerol synthesis and is thought to be rate limiting in most circumstances
Anonymous Quiz
15%
phosphatidate phosphohydrolase
23%
glycerol-3-phosphate acyltransferase
15%
1-acylglycerol-3-phosphate acyltransferase
42%
diacylglycerol acyltransferase (DGAT)
5%
monoacylglycerol acyltransferase
Forwarded from Dr. Shaimaa MCQ
Cardiolipin (diphosphatidylglycerol) is a phospholipid present in mitochondria. It is formed from phosphatidylglycerol, which in turn is synthesized from CDP-diacylglycerol and ------------------
Anonymous Quiz
30%
1,2-diacylglycerol
10%
triacylglycerol
47%
glycerol 3-phosphate
7%
monoacylglycerol
7%
monoacylglycerol phosphate
Forwarded from Dr. Shaimaa MCQ
Cardiolipin, found in the ----------------------------
Anonymous Quiz
69%
inner membrane of mitochondria
14%
outer membrane of mitochondria
12%
outer membrane of Golgi apparatus
5%
none of the above
Forwarded from Dr. Shaimaa MCQ
Plasmalogens and platelet activating factor are
Anonymous Quiz
21%
glycerol ester phospholipids
9%
glycerol aldhyde phospholipids
11%
none glycerol ether phospholipids
50%
glycerol ether phospholipids
10%
none of the above
Forwarded from Dr. Shaimaa MCQ
----------------- is the precursor of the glycerol moiety in the synthesis of glycerol ether phospholipids
Anonymous Quiz
23%
Dihydroxyacetone
10%
Trihydroxyacetone phosphate
10%
monohydroxyacetone phosphate
10%
glycerol 1-phosphate
48%
Dihydroxyacetone phosphate
Forwarded from Dr. Shaimaa MCQ
------------------ is the precursor of the glycerol moiety in the synthesis of plasmalogens
Anonymous Quiz
15%
Dihydroxyacetone
10%
Trihydroxyacetone phosphate
10%
monohydroxyacetone phosphate
6%
glycerol 1-phosphate
58%
Dihydroxyacetone phosphate
Forwarded from Dr. Shaimaa MCQ
The ----------------- is the precursor of the glycerol moiety in the synthesis of platelet activating factor
Anonymous Quiz
9%
dihydroxyacetone
6%
trihydroxyacetone phosphate
7%
monohydroxyacetone phosphate
6%
glycerol 1-phosphate
72%
dihydroxyacetone phosphate
Forwarded from Dr. Shaimaa MCQ
Phospholipase A2 catalyzes the hydrolysis of glycerophospholipids to form a--------and lysophospholipid
Anonymous Quiz
8%
dihydroxyacetone
7%
trihydroxyacetone phosphate
57%
free fatty acid
11%
glycerol 1-phosphate
17%
dihydroxyacetone phosphate
Forwarded from Dr. Shaimaa MCQ
Lysophospholipid (eg, lysolecithin) is attacked by lysophospholipase, forming the corresponding glyceryl phosphoryl base, which may then be split by a hydrolase liberating ------------------ plus base.
Anonymous Quiz
49%
glycerol 3-phosphate
10%
trihydroxyacetone phosphate
26%
free fatty acid
9%
glycerol 1-phosphate
7%
dihydroxyacetone phosphate
Forwarded from Dr. Shaimaa MCQ
Long-chain saturated fatty acids are found predominantly in the 1 position of phospholipids
Anonymous Quiz
14%
3
32%
1
24%
2
26%
All of the above
4%
None of the above
Forwarded from Dr. Shaimaa MCQ
All sphingolipids are formed from
Anonymous Quiz
4%
creatine
6%
creatinine
20%
dihydroxyacetone phosphate
64%
ceramide
6%
biotin
Forwarded from Dr. Shaimaa MCQ
- In the synthesis of ceramide, the ---------------- is required as a reductant in the 3-ketosphinganine reductase step
Anonymous Quiz
43%
NADPH
18%
NADH
9%
FADH2
25%
all the above
6%
none of the above
Forwarded from Dr. Shaimaa MCQ
In the synthesis of ceramide the following are required
Anonymous Quiz
22%
palmitoyl-CoA, and serine
10%
serine palmitoyl transferase
7%
pyridoxal phosphate
7%
Mn2+
53%
All of the above
Forwarded from Dr. Shaimaa MCQ
When ceramide reacts with phosphatidylcholine the products are -----------------plus diacylglycerol
Anonymous Quiz
14%
glycerol 3-phosphate
65%
sphingomyelin
9%
free fatty acid
5%
glycerol 1-phosphate
6%
dihydroxyacetone phosphate