WGU C785 BIOCHEMISTRY OA EXAMINATION
TEST 2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◉ Which of the following is a 5-carbon sugar?
1. Glucose
2. Fructose
3. Ribose
4. Sucrose. Answer: 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. Answer: 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. Answer: 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
3. Joins two or more substances into a larger molecule
4. Acts as a chemical messenger between amino cells. Answer: 3
Anabolism is the opposite of catabolism and is a set of metabolic
pathways that serve to create, construct, or synthesize larger molecules
from smaller ones, such as the synthesis of carbohydrates, proteins and
TEST 2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◉ Which of the following is a 5-carbon sugar?
1. Glucose
2. Fructose
3. Ribose
4. Sucrose. Answer: 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. Answer: 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. Answer: 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
3. Joins two or more substances into a larger molecule
4. Acts as a chemical messenger between amino cells. Answer: 3
Anabolism is the opposite of catabolism and is a set of metabolic
pathways that serve to create, construct, or synthesize larger molecules
from smaller ones, such as the synthesis of carbohydrates, proteins and
