Quick Biochemistry - Enzymes (Section 7)
1
Which substance is a competitive inhibitor of carbonic anhydrase?
2
An elevated serum lactate dehydrogenase level is observed in which condition?
3
In the context of a heart attack, which serum enzyme typically increases?
4
Following a heart attack, which enzyme in the blood tends to increase the fastest?
6
Where is alkaline phosphatase found?
7
Which specific lactate dehydrogenase isoenzyme is associated with a heart attack?
8
What term describes enzymes consistently present in an organism?
9
What are inactive enzyme precursors called?
10
Which of the following is an inactive enzyme precursor?
11
How do allosteric enzymes control product creation?
12
What chemical group is added or removed in the regulation of some enzymes through covalent modification?
13
What is generally needed for covalent modification of an enzyme?
14
What term describes an inorganic ion essential for an enzyme's function?
15
Which was the first enzyme discovered to have different forms (isoenzymes)?
16
Where is lactate dehydrogenase primarily found within a cell?
17
What is the structure of Lactate dehydrogenase in terms of subunit count?
18
In which condition is Ceruloplasmin not found?
19
What element does Ceruloplasmin help to oxidize?
20
Where is Creatine kinase not usually found?
21
In which locations is alkaline phosphatase found?
22
Which of the following enzymes does NOT require zinc?
23
Which enzyme below does NOT utilize iron?
24
What is the coenzyme associated with Biotin?
25
How do enzymes speed up chemical reactions?
Answer(C)
Decreasing the energy of activation
26
What method is commonly used to analyze the behavior of allosteric enzymes?
27
Which amino acid residue is commonly modified through phosphorylation / dephosphorylation in enzymes?
28
Which factors can influence the maximum velocity (Vmax) of an enzyme?
29
Which factor typically varies in enzyme assays?
30
When the substrate concentration is significantly lower than the enzyme's Km, how does the reaction velocity relate to the substrate concentration?
Answer(A)
Directly proportional to substrate concentration
31
For enzymes that use NAD, at which wavelength change in absorbance is typically measured during the assay?
32
What characteristic is shared by different forms (isoenzymes) of the same enzyme?
33
In a peptide composed of phenylalanine, alanine, leucine, lysine, and arginine, which enzyme would remove the phenylalanine?
34
Which of the following phosphate compounds is classified as a high-energy phosphate?
35
Which of the listed compounds contains the greatest amount of stored energy?
36
What is the typical daily amount of urobilinogen excreted in the urine of adult males?
37
In a patient experiencing a blockage of the bile ducts (obstructive jaundice), what is the expected level of urobilinogen in the feces?
38
Which of the following substances can be used to produce Acetyl-CoA?
39
What kind of reaction is involved in the conversion of pyruvate to acetyl-CoA?
Answer(C)
Oxidative decarboxylation
40
Which enzyme or enzyme complex is responsible for the conversion of pyruvate to acetyl CoA?
Answer(D)
All the 3 acting in concert
41
Where within a cell is the pyruvate dehydrogenase complex found?
42
Which molecule functions as a flavoprotein within the pyruvate dehydrogenase complex?
Answer(C)
Dihydrolipoyl dehydrogenase
43
What mechanisms control the activity of the pyruvate dehydrogenase complex?
Answer(C)
Both covalent modification and allosteric regulation
44
Which of the following acts as an allosteric inhibitor of pyruvate dehydrogenase?
46
How many reactions in the citric acid cycle reduce NAD?
47
Which enzyme within the citric acid cycle contains a flavoprotein?
48
In the citric acid cycle, what molecule is phosphorylated to form GTP?
49
Which enzyme is inhibited by malonate?
50
Which molecule allosterically inhibits isocitrate dehydrogenase?
