BIO 101 EXAM 3 ACTUAL PAPER 2026
COMPLETE QUESTIONS AND SOLUTIONS
CERTIFICATION READY
◉ The beginning of anaphase is indicated by which of the following?
Answer: enzymatic cleavage of cohesin
◉ Which of the following statements provides an example of
epistasis?
Answer: In rabbits and many other mammals, one genotype (ee)
prevents any fur color from developing.
◉ The cell cycle is regulated at the molecular level by a set of
proteins known as
Answer: cyclins
◉ A given organism has 46 chromosomes in its karyotype. We can
therefore conclude which of the following?
Answer: Its gametes must have 23 chromosomes.
◉ If a horticulturist breeding gardenias succeeds in having a single
plant with a particularly desirable set of traits, which of the
,following would be her most probable and efficient route to
establishing a line of such plants?
Answer: Clone the plant asexually to produce an identical one.
◉ When crossing an organism that is homozygous recessive for a
single trait with a heterozygote, what is the chance of producing an
offspring with the homozygous recessive phenotype?
Answer: 50%
◉ Movement of the chromosomes during anaphase would be most
affected by a drug that prevents
Answer: shortening of microtubules.
◉ How does a bacterial cell protect its own DNA from restriction
enzymes?
Answer: by adding methyl groups to adenines and cytosines
◉ What is the most logical sequence of steps for splicing foreign
DNA into a plasmid and inserting the plasmid into a bacterium?
Answer: Extract plasmid DNA from bacterial cells. Cut the plasmid
DNA using restriction enzymes. Hydrogen-bond the plasmid DNA to
nonplasmid DNA fragments. Use ligase to seal plasmid DNA to
nonplasmid DNA. Transform bacteria with a recombinant DNA
molecule.
, ◉ Which of the following statements accurately describes why Taq
polymerase is used in PCR?
Answer: It is heat stable and can withstand the heating step of PCR.
◉ (Figure 1)
G1 is represented by which numbered part(s) of the cycle?
Answer: I or V
◉ During DNA replication, which of the following enzymes separates
the DNA strands during replication?
Answer: helicase
◉ After telophase I of meiosis, the chromosomal makeup of each
daughter cell is
Answer: haploid, and the chromosomes are each composed of two
chromatids.
◉ Refer to the drawings in the figure of a single pair of homologous
chromosomes as they might appear during various stages of either
mitosis or meiosis. Which diagram represents anaphase I of meiosis?
Answer: I
COMPLETE QUESTIONS AND SOLUTIONS
CERTIFICATION READY
◉ The beginning of anaphase is indicated by which of the following?
Answer: enzymatic cleavage of cohesin
◉ Which of the following statements provides an example of
epistasis?
Answer: In rabbits and many other mammals, one genotype (ee)
prevents any fur color from developing.
◉ The cell cycle is regulated at the molecular level by a set of
proteins known as
Answer: cyclins
◉ A given organism has 46 chromosomes in its karyotype. We can
therefore conclude which of the following?
Answer: Its gametes must have 23 chromosomes.
◉ If a horticulturist breeding gardenias succeeds in having a single
plant with a particularly desirable set of traits, which of the
,following would be her most probable and efficient route to
establishing a line of such plants?
Answer: Clone the plant asexually to produce an identical one.
◉ When crossing an organism that is homozygous recessive for a
single trait with a heterozygote, what is the chance of producing an
offspring with the homozygous recessive phenotype?
Answer: 50%
◉ Movement of the chromosomes during anaphase would be most
affected by a drug that prevents
Answer: shortening of microtubules.
◉ How does a bacterial cell protect its own DNA from restriction
enzymes?
Answer: by adding methyl groups to adenines and cytosines
◉ What is the most logical sequence of steps for splicing foreign
DNA into a plasmid and inserting the plasmid into a bacterium?
Answer: Extract plasmid DNA from bacterial cells. Cut the plasmid
DNA using restriction enzymes. Hydrogen-bond the plasmid DNA to
nonplasmid DNA fragments. Use ligase to seal plasmid DNA to
nonplasmid DNA. Transform bacteria with a recombinant DNA
molecule.
, ◉ Which of the following statements accurately describes why Taq
polymerase is used in PCR?
Answer: It is heat stable and can withstand the heating step of PCR.
◉ (Figure 1)
G1 is represented by which numbered part(s) of the cycle?
Answer: I or V
◉ During DNA replication, which of the following enzymes separates
the DNA strands during replication?
Answer: helicase
◉ After telophase I of meiosis, the chromosomal makeup of each
daughter cell is
Answer: haploid, and the chromosomes are each composed of two
chromatids.
◉ Refer to the drawings in the figure of a single pair of homologous
chromosomes as they might appear during various stages of either
mitosis or meiosis. Which diagram represents anaphase I of meiosis?
Answer: I
