Quick Biochemistry - Proteins And Protein Metabolism (Section 3)
1
What is the final product of protein breakdown within the gastrointestinal tract?
2
How are the naturally occurring L-isomers of amino acids primarily taken up from the intestine?
3
What medical conditions are characterized by defects in the blood clotting process?
4
In the process of transamination, which is crucial for amino acid synthesis from carbohydrate intermediates, what coenzyme is essential?
5
Where does oxidative deamination predominantly occur within the body?
6
In which physiological state is a positive nitrogen balance typically observed?
7
In mammals, where does the primary synthesis of urea take place?
8
Within which cellular compartments are the enzymes involved in urea synthesis located?
Answer(C)
Both mitochondria and cytosol
9
How many ATP molecules are consumed during the urea synthesis process?
10
The release of ammonia from L-α-amino acids is mainly due to the combined effect of transaminase and which enzyme?
Answer(A)
L-glutamate dehydrogenase
11
During urea production, which amino acid only assists an enzyme's activity?
12
The enzyme carbamoyl phosphate synthetase needs which of these?
13
Which enzyme plays a key regulatory role in the urea cycle?
Answer(A)
Carbamoyl phosphate synthetase
14
What enzyme, found in liver mitochondria, facilitates the transfer of a carbamoyl group from carbamoyl phosphate to ornithine?
Answer(B)
Ornithine transcarbamoylase
15
Which molecule acts as a bridge between the citric acid cycle and the urea cycle?
16
What are the sources of the two nitrogen atoms in urea?
17
In the context of carcinoid syndrome, which substance is overproduced by the argentaffin tissue in the abdomen?
18
Which of the following is tryptophan a precursor for?
19
What substance is required by tyrosine hydroxylase for the conversion of tyrosine to dihydroxyphenylalanine?
20
Which step is the slowest in the process of catecholamine biosynthesis?
Answer(C)
Hydroxylation of tyrosine
21
What cofactor is essential for the enzyme that converts dopamine to norepinephrine?
22
In humans, which form is most of the sulfur from methionine and cysteine eliminated in?
23
Which amino acid contributes to a minor portion of urinary oxalates?
24
Which amino acid is crucial for the detoxification of benzoic acid, resulting in the formation of hippuric acid?
25
Which amino acids are used in the creation of creatin?
Answer(A)
Arginine, glycine, active methionine
26
What is the chemical score often assigned to egg proteins?
27
What is the chemical score typically assigned to milk proteins?
28
What is the typical chemical score associated with the proteins of bengal gram?
29
What is the chemical score generally given to protein gelatin?
30
What is the common chemical score for protein zein?
31
What is the approximate biological value of egg white protein?
32
What is the approximate net protein utilisation of egg protein?
33
What is the approximate net protein utilization of milk protein?
34
What best describes a limiting amino acid?
Answer(A)
That is most deficient in proteins
35
Which amino acid is typically the limiting one in rice?
36
Which amino acid is usually the limiting one in fish proteins?
37
Pulses are typically low in which amino acid?
38
Which trace element is typically present in a low amount in milk?
39
What type of conjugated protein is found in egg yolk?
40
What is the primary protein found in cow's milk?
41
Which water-soluble vitamin is typically lacking in eggs?
42
Which amino acid is typically abundant in pulses?
43
Which of the following is usually present in small amounts in milk?
44
Compared to other options, which nutrient is found in lower quantities in milk?
45
What is the impact on protein needs when net protein utilization (NPU) is low?
46
Approximately what percentage of human milk is protein?
47
Approximately what percentage of cow's milk is protein?
48
What is the approximate protein content of soybeans?
49
What is the amount of lipids found in egg white?
50
What is the general recommended daily intake of protein for a grown man?
