BIO 171 (2025) COMPREHENSIVE QUESTIONS AND VERIFIED
ANSWERS ( DETAILED & ELABORATED) ACTUAL EXAM 2025
TEST!!
Question 1
Which stage of meiotic cell division is characterized as "equational division," where the number
of chromosomes is unchanged?
A) Meiosis 1
B) Mitosis
C) S-phase
D) Cytokinesis
E) Meiosis 2
Correct Answer: E) Meiosis 2
Rationale: Meiosis 2 is defined as "Equational division, the second stage of meotic cell
division, in which the number of chromosomes is unchanged."
Question 2
What is an organic molecule containing a central carbon atom, a carboxyl group, an amino
group, a hydrogen atom, and a side chain, serving as the building blocks of proteins?
A) Carbohydrate
B) Lipid
C) Nucleic Acid
D) Amino Acid
E) Fatty Acid
Correct Answer: D) Amino Acid
Rationale: Amino Acid is defined as "An organic molecule containing a central
, carbon atom, a carboxyl group, an amino group, a hydrogen atom, and a side chain.
Building blocks of proteins."
Question 3
Which of the three domains of life consists of single-celled organisms without true
chromosomes or a nucleus, differing from bacteria in many aspects of their cell and molecular
biology, and dividing by binary fission?
A) Bacteria
B) Eukarya
C) Protist
D) Fungi
E) Archaea
Correct Answer: E) Archaea
Rationale: Archaea is defined as "One of the three domains of life, consisting of
single-celled organisms without true chromosomes or a nucleus that divide by
binary fission, differing from bacteria in many aspects of their cell and molecular
biology."
Question 4
What is a group of three adjacent nucleotides that specifies an amino acid in a protein or that
terminates polypeptide synthesis?
A) Gene
B) Allele
C) Chromosome
D) Codon
ANSWERS ( DETAILED & ELABORATED) ACTUAL EXAM 2025
TEST!!
Question 1
Which stage of meiotic cell division is characterized as "equational division," where the number
of chromosomes is unchanged?
A) Meiosis 1
B) Mitosis
C) S-phase
D) Cytokinesis
E) Meiosis 2
Correct Answer: E) Meiosis 2
Rationale: Meiosis 2 is defined as "Equational division, the second stage of meotic cell
division, in which the number of chromosomes is unchanged."
Question 2
What is an organic molecule containing a central carbon atom, a carboxyl group, an amino
group, a hydrogen atom, and a side chain, serving as the building blocks of proteins?
A) Carbohydrate
B) Lipid
C) Nucleic Acid
D) Amino Acid
E) Fatty Acid
Correct Answer: D) Amino Acid
Rationale: Amino Acid is defined as "An organic molecule containing a central
, carbon atom, a carboxyl group, an amino group, a hydrogen atom, and a side chain.
Building blocks of proteins."
Question 3
Which of the three domains of life consists of single-celled organisms without true
chromosomes or a nucleus, differing from bacteria in many aspects of their cell and molecular
biology, and dividing by binary fission?
A) Bacteria
B) Eukarya
C) Protist
D) Fungi
E) Archaea
Correct Answer: E) Archaea
Rationale: Archaea is defined as "One of the three domains of life, consisting of
single-celled organisms without true chromosomes or a nucleus that divide by
binary fission, differing from bacteria in many aspects of their cell and molecular
biology."
Question 4
What is a group of three adjacent nucleotides that specifies an amino acid in a protein or that
terminates polypeptide synthesis?
A) Gene
B) Allele
C) Chromosome
D) Codon
