WGU C190 INTRODUCTION TO
BIOLOGY COMPREHENSIVE OA PREP
QUESTIONS AND ANSWERS
1. Which molecule is the primary storage form of glucose in animals and is stored in the liver
and muscles?
A. Glycogen
B. Cellulose
C. Starch
D. Chitin
Answer: A
Conceptual Explanation: Glycogen is a multi-branched polysaccharide of glucose that
serves as a form of energy storage in animals and fungi.
2. In a DNA molecule, which nitrogenous base always pairs with Cytosine?
A. Adenine
B. Thymine
C. Guanine
,D. Uracil
Answer: C
Conceptual Explanation: Based on Chargaff’s rules, Guanine always pairs with Cytosine
via three hydrogen bonds in a DNA double helix.
3. What is the primary function of the rough endoplasmic reticulum?
A. Protein synthesis and modification
B. Detoxification of chemicals
C. Lipid synthesis
D. Energy production
Answer: A
Conceptual Explanation: The rough ER is studded with ribosomes and is primarily
responsible for the synthesis and folding of proteins.
4. Which phase of mitosis involves the alignment of chromosomes along the center of the
cell?
A. Prophase
B. Telophase
C. Anaphase
D. Metaphase
, Answer: D
Conceptual Explanation: During metaphase, chromosomes line up at the metaphase plate
(the equator) before being pulled apart.
5. What process results in the production of two genetically identical daughter cells?
A. Meiosis
B. Binary Fission
C. Fertilization
D. Mitosis
Answer: D
Conceptual Explanation: Mitosis is the process of cell division that results in two
daughter cells each having the same number and kind of chromosomes as the parent
nucleus.
6. Which of the following describes an organism that has two different alleles for a specific
trait?
A. Homozygous
B. Heterozygous
C. Hemizygous
D. Phenotype
Answer: B
BIOLOGY COMPREHENSIVE OA PREP
QUESTIONS AND ANSWERS
1. Which molecule is the primary storage form of glucose in animals and is stored in the liver
and muscles?
A. Glycogen
B. Cellulose
C. Starch
D. Chitin
Answer: A
Conceptual Explanation: Glycogen is a multi-branched polysaccharide of glucose that
serves as a form of energy storage in animals and fungi.
2. In a DNA molecule, which nitrogenous base always pairs with Cytosine?
A. Adenine
B. Thymine
C. Guanine
,D. Uracil
Answer: C
Conceptual Explanation: Based on Chargaff’s rules, Guanine always pairs with Cytosine
via three hydrogen bonds in a DNA double helix.
3. What is the primary function of the rough endoplasmic reticulum?
A. Protein synthesis and modification
B. Detoxification of chemicals
C. Lipid synthesis
D. Energy production
Answer: A
Conceptual Explanation: The rough ER is studded with ribosomes and is primarily
responsible for the synthesis and folding of proteins.
4. Which phase of mitosis involves the alignment of chromosomes along the center of the
cell?
A. Prophase
B. Telophase
C. Anaphase
D. Metaphase
, Answer: D
Conceptual Explanation: During metaphase, chromosomes line up at the metaphase plate
(the equator) before being pulled apart.
5. What process results in the production of two genetically identical daughter cells?
A. Meiosis
B. Binary Fission
C. Fertilization
D. Mitosis
Answer: D
Conceptual Explanation: Mitosis is the process of cell division that results in two
daughter cells each having the same number and kind of chromosomes as the parent
nucleus.
6. Which of the following describes an organism that has two different alleles for a specific
trait?
A. Homozygous
B. Heterozygous
C. Hemizygous
D. Phenotype
Answer: B
