Biochemistry WGU c785 question with answers
Nonenzymatic glycosylation or glycation creates glycoproteins by:
1. Chemical addition of sugars to polypeptides
2. Extracellular synthesis
3. Attaching 20 amino acids
4. Secretion into extracellular matrix - -1
Nonenzymatic glycosylation or glycation creates glycoproteins by the chemical
addition of sugars to polypeptides. Since this type of glycosylation is nonenzymatic,
the time and the concentration of sugar control glycosylation. Because people with
higher circulating levels of glucose have higher levels of nonenzymatic
glycosylation, measurement of the glycosylated hemoglobin A1c is a diagnostic test
used to monitor blood sugar levels in persons with diabetes.
-Which of the following is a 5-carbon sugar?
1. Glucose
2. Fructose
3. Ribose
4. Sucrose - -3
Ribose is a pentose, a simple sugar (monosaccharide) that has five carbon atoms
per molecule. It is synthesized in the body and obtained in small amounts from
consumption of ripe fruits and vegetables. Ribose serves as an energy substrate for
the resynthesis of ATP and is a key component of ribonucleic acid (RNA).
Deoxyribose, a component of DNA, also is a pentose.
-The optimum pH of pepsin is:
1. 5
2. 7.1
3. 8.1
4. 2 - -4
The optimum pH for enzymes varies for different enzymes and even enzymes with
similar actions may have different optimal pH based on where they act. For
example, trypsin, a digestive enzyme that acts in the small intestine has an optimal
pH of 8 while pepsin, which acts in the more acidic milieu of the stomach, has an
optimal pH of 2.
-A catabolic enzyme:
1. Joins two or more substances into a larger molecule
2. Cleaves a molecule into two or more parts
3. Inserts a substance between two or more existing molecules
4. Acts as a chemical messenger between amino cells - -2
A catabolic enzyme engages in destructive metabolism, which involves degrading or
breaking down complex molecules into simpler ones with the resulting release of
energy. In the body, the breakdown of food in the gastrointestinal tract by a variety
of digestive enzymes is an example of a catabolic process. The opposite of
catabolism is anabolism.
-An anabolic enzyme:
1. Cleaves a molecule into two or more parts
2. Inserts a substance between two or more existing molecules
Nonenzymatic glycosylation or glycation creates glycoproteins by:
1. Chemical addition of sugars to polypeptides
2. Extracellular synthesis
3. Attaching 20 amino acids
4. Secretion into extracellular matrix - -1
Nonenzymatic glycosylation or glycation creates glycoproteins by the chemical
addition of sugars to polypeptides. Since this type of glycosylation is nonenzymatic,
the time and the concentration of sugar control glycosylation. Because people with
higher circulating levels of glucose have higher levels of nonenzymatic
glycosylation, measurement of the glycosylated hemoglobin A1c is a diagnostic test
used to monitor blood sugar levels in persons with diabetes.
-Which of the following is a 5-carbon sugar?
1. Glucose
2. Fructose
3. Ribose
4. Sucrose - -3
Ribose is a pentose, a simple sugar (monosaccharide) that has five carbon atoms
per molecule. It is synthesized in the body and obtained in small amounts from
consumption of ripe fruits and vegetables. Ribose serves as an energy substrate for
the resynthesis of ATP and is a key component of ribonucleic acid (RNA).
Deoxyribose, a component of DNA, also is a pentose.
-The optimum pH of pepsin is:
1. 5
2. 7.1
3. 8.1
4. 2 - -4
The optimum pH for enzymes varies for different enzymes and even enzymes with
similar actions may have different optimal pH based on where they act. For
example, trypsin, a digestive enzyme that acts in the small intestine has an optimal
pH of 8 while pepsin, which acts in the more acidic milieu of the stomach, has an
optimal pH of 2.
-A catabolic enzyme:
1. Joins two or more substances into a larger molecule
2. Cleaves a molecule into two or more parts
3. Inserts a substance between two or more existing molecules
4. Acts as a chemical messenger between amino cells - -2
A catabolic enzyme engages in destructive metabolism, which involves degrading or
breaking down complex molecules into simpler ones with the resulting release of
energy. In the body, the breakdown of food in the gastrointestinal tract by a variety
of digestive enzymes is an example of a catabolic process. The opposite of
catabolism is anabolism.
-An anabolic enzyme:
1. Cleaves a molecule into two or more parts
2. Inserts a substance between two or more existing molecules
