What is the typical range for normal serum alkaline phosphatase activity?
إجابة
(B)
5.0-13.0 KA units/100 ml
2
Which measurement is most indicative of early myocardial ischemia?
إجابة
(A)
CPK
3
Which condition is associated with elevated serum acid phosphatase levels?
إجابة
(A)
Metastatic carcinoma of prostate
4
Which of the following is linked to increased serum alkaline phosphatase levels?
إجابة
(C)
Hyperparathyroidism
5
Which medical condition is often accompanied by a rise in serum lipase levels?
إجابة
(C)
Acute pancreatitis
6
Which condition is characterized by a reduction in serum ferroxidase levels?
إجابة
(D)
Wilson's disease
7
In which of the following is the LDH isoenzyme often elevated?
إجابة
(C)
Liver disease
8
Which enzyme is typically elevated on the third day after the onset of an acute myocardial infarction?
إجابة
(C)
Serum LDH
9
Which condition often sees elevated levels of LDH1 and LDH2?
إجابة
(A)
Myocardial infarction
10
Which CK isoenzymes are found in cardiac muscle?
إجابة
(B)
MM and MB
11
In the early stages of acute inflammation of the pancreas, which enzyme typically shows an elevated level within the initial five days?
إجابة
(A)
Serum amylase
12
What is a key characteristic of acute pancreatitis related to enzyme activity?
إجابة
(C)
Zymogen enzymes becoming active too early
13
Which of the following enzymes found in plasma serves a specific physiological function?
إجابة
(A)
Lipoprotein lipase
14
Which enzyme, present in the plasma, does not have a primary function in the plasma itself?
إجابة
(D)
Lipase
15
What is the ideal pH range for salivary amylase to function most effectively?
إجابة
(A)
6.6-6.8
16
What is the optimal pH for pancreatic amylase activity?
إجابة
(D)
8.6
17
At what pH does sucrase demonstrate the highest level of activity?
إجابة
(A)
5.0-7.0
18
What pH range is most conducive for maltase to perform its function efficiently?
إجابة
(C)
5.8-6.2
19
What is the optimal pH range for lactase activity?
إجابة
(B)
5.4-6.0
20
Which of the following substances acts as the primary target for amylase?
إجابة
(B)
Starch
21
Which ion plays a crucial role in enabling the function of salivary amylase?
إجابة
(A)
Chloride
22
What substance enhances the activity of pancreatic amylase?
إجابة
(B)
Bile salts
23
Which of the following carbohydrates is indigestible in the human digestive system?
إجابة
(A)
Cellulose
24
What type of sugar uptake relies on facilitated diffusion, employing a Na-independent transporter?
إجابة
(B)
Fructose
25
In the small intestine, which pair of sugars experiences the highest absorption rate?
إجابة
(A)
Glucose and galactose
26
What vitamin is known to enhance the absorption of glucose?
إجابة
(B)
Thiamin
27
Which hormone directly influences the intestinal lining, thereby stimulating the absorption of glucose?
إجابة
(C)
Thyroxine
28
Given the provided information about ATP and Glucose 6-phosphate hydrolysis, calculate the standard free energy change (AG°) for the phosphorylation of glucose: Glucose + ATP → Glucose 6-Phosphate + ADP.
إجابة
(C)
-4.0 Kcal/mol
29
When blood glucose levels are low, the brain, unlike the liver, can still absorb glucose. This difference is attributed to the
إجابة
(A)
Low K of hexokinase
30
In the chemical reaction: NuTP + glucose → Glucose 6-Phosphate + NuDP, what does 'NuTP' represent?
إجابة
(A)
ATP
31
Referring to the provided diagrams, where is fructose 1,6-biphosphate located?
إجابة
(C)
C
32
Which glycolytic enzyme is susceptible to fluoride ion inhibition?
إجابة
(C)
Enolase
33
In glycolysis, which enzyme's function is disrupted by iodoacetate?
إجابة
(B)
Glyceraldehyde-3-phosphate dehydrogenase
34
What enzyme catalyzes the conversion of enolpyruvate to ketopyruvate in the glycolytic pathway?
إجابة
(D)
Spontaneously
35
In red blood cells, what intermediate is the precursor to 2,3-biphosphoglycerate?
إجابة
(B)
1, 3-Biphosphoglycerate
36
High concentrations of 2,3-biphosphoglycerate interacting with hemoglobin result in what effect on the oxyhemoglobin dissociation curve?
إجابة
(B)
Displacement of the oxyhemoglobin dissociation curve to the right
37
Which of the following compounds can accumulate in erythrocytes under normal circumstances and in anaerobic microorganisms?
إجابة
(D)
Lactate
38
Which enzyme(s) involved in glycolysis contribute to the high-energy phosphorylation of substrates?
إجابة
(D)
Glyceraldehyde-3-phosphate dehydrogenase
39
The Lineweaver-Burk plot is used to analyze which of the following factors?
إجابة
(D)
Both (A) and (B)
40
Which of the following substances inhibits the activity of phosphofructokinase, a key enzyme in glycolysis?
إجابة
(A)
Citrate and ATP
41
Which enzyme plays a role in controlling the rate of glycolysis?
إجابة
(A)
Phosphofructokinase
42
Hexokinase's function is reduced through which of the following mechanisms?
إجابة
(A)
Glucose-6-Phosphate
43
Which of the following processes involves the rearrangement of molecular structure?
إجابة
(A)
Glucose 6-Phosphate fructose 6 phosphate
44
What is the overall yield of ATP molecules from one glucose molecule in the absence of oxygen during glycolysis?
إجابة
(B)
2
45
The multi-enzyme complex involved in converting pyruvate is essential for creating
إجابة
(A)
Acetyl-CoA
46
A lack of thiamin in the diet negatively affects which enzyme's function?
إجابة
(B)
Pyruvate dehydrogenase
47
Which substance reduces the activity of the enzyme that processes pyruvate?
إجابة
(A)
Mercury
48
In a typical human at rest, what organ or tissue utilizes the majority of the glucose in the blood?
إجابة
(A)
Liver
49
Where are the enzymes of the glycolysis pathway primarily located within the cell?
إجابة
(A)
Extramitochondrial soluble fraction of the cell
50
Considering metabolic pathways as primarily building up or breaking down, which one is best described as having both characteristics?
