biochem
exam 2
問題一覧
1
Which of the following is required for the rearrangement of methyl group present in L-methylmalonyl-CoA to produce succinyl-CoA?
vitamin B12
2
An amino acid that does NOT derive its carbon skeleton, at least in part, from α-ketoglutarate is:
threonine
3
Erythrose 4-phosphate is a precursor of:
phenylalanine
4
Glutamate is metabolically converted to α-ketoglutarate and NH4+ by a process described as:
oxidative deamination
5
Which amino acid(s) is/are metabolites in the urea cycle, but is/are not used as (a) building block(s) of proteins?
ornithine and citrulline
6
Which of these directly donates a nitrogen atom for the formation of urea during the urea cycle?
Aspartate
7
In the urea cycle, the second nitrogen of urea enters the cycle in the form of which of the following metabolites?
aspartate
8
The urea cycle is:
none of the above
9
Conversion of ornithine to citrulline is a step in the synthesis of
urea
10
Which is the most stable and most reduced form of tetrahydrofolate (THF) carrying a one-carbon group?
N5-methyl-THF
11
Tetrahydrofolate and its derivatives shuttle _________________ between different substrates.
one carbon units
12
Which of the following is required for the rearrangement of methyl group present in L-methylmalonyl-CoA to produce succinyl-CoA?
vitamin b12
13
Which of the following compounds is needed for the rearrangement of the methyl group of L-methylmalonyl-CoA to form succinyl-CoA?
vitamin B12
14
What is the major function of lecithin:cholesterol acyltransferase?
to form cholesterylester
15
Which lipoprotein has least density?
chylomicron
16
Which of the following lipoproteins contains highest concentrations of total proteins?
HDL
17
Which of the following lipoproteins contains lecithin:cholesterol acyltransferase as their integral part?
HDL
18
Which of the following compounds is nutritionally essential dietary source of arachidonates in humans?
Linoleate
19
Which of the following compounds can activate phospholipase A2 in order to release the precursor molecule for eicosanoid biosynthesis?
histamine
20
Eicosanoids are composed of 20 carbon atoms containing four double bonds.
false
21
Erythrose 4-phosphate is a precursor of:
phenylalanine
22
The conversion of glutamate to an α-ketoacid and NH4+:
is catalyzed by glutamate dehydrogenase.
23
Which of these amino acids are both ketogenic and glucogenic?
isoleucine and tyrosine
24
Serine or cysteine may enter the citric acid cycle as acetyl-CoA after conversion to:
Pryruvate
問題一覧
1
Which of the following is required for the rearrangement of methyl group present in L-methylmalonyl-CoA to produce succinyl-CoA?
vitamin B12
2
An amino acid that does NOT derive its carbon skeleton, at least in part, from α-ketoglutarate is:
threonine
3
Erythrose 4-phosphate is a precursor of:
phenylalanine
4
Glutamate is metabolically converted to α-ketoglutarate and NH4+ by a process described as:
oxidative deamination
5
Which amino acid(s) is/are metabolites in the urea cycle, but is/are not used as (a) building block(s) of proteins?
ornithine and citrulline
6
Which of these directly donates a nitrogen atom for the formation of urea during the urea cycle?
Aspartate
7
In the urea cycle, the second nitrogen of urea enters the cycle in the form of which of the following metabolites?
aspartate
8
The urea cycle is:
none of the above
9
Conversion of ornithine to citrulline is a step in the synthesis of
urea
10
Which is the most stable and most reduced form of tetrahydrofolate (THF) carrying a one-carbon group?
N5-methyl-THF
11
Tetrahydrofolate and its derivatives shuttle _________________ between different substrates.
one carbon units
12
Which of the following is required for the rearrangement of methyl group present in L-methylmalonyl-CoA to produce succinyl-CoA?
vitamin b12
13
Which of the following compounds is needed for the rearrangement of the methyl group of L-methylmalonyl-CoA to form succinyl-CoA?
vitamin B12
14
What is the major function of lecithin:cholesterol acyltransferase?
to form cholesterylester
15
Which lipoprotein has least density?
chylomicron
16
Which of the following lipoproteins contains highest concentrations of total proteins?
HDL
17
Which of the following lipoproteins contains lecithin:cholesterol acyltransferase as their integral part?
HDL
18
Which of the following compounds is nutritionally essential dietary source of arachidonates in humans?
Linoleate
19
Which of the following compounds can activate phospholipase A2 in order to release the precursor molecule for eicosanoid biosynthesis?
histamine
20
Eicosanoids are composed of 20 carbon atoms containing four double bonds.
false
21
Erythrose 4-phosphate is a precursor of:
phenylalanine
22
The conversion of glutamate to an α-ketoacid and NH4+:
is catalyzed by glutamate dehydrogenase.
23
Which of these amino acids are both ketogenic and glucogenic?
isoleucine and tyrosine
24
Serine or cysteine may enter the citric acid cycle as acetyl-CoA after conversion to:
Pryruvate