BIOD 101 MODULE 4 PROBLEM SET
PRACTICE QUESTIONS WITH VERIFIED
SOLUTIONS GRADED A+ TESTED AND
APPROVED!!!
Question 1
What are the four phases of the cell cycle?
Answer: (1) Gap phase 1 (G1), (2) DNA synthesis (S-phase), (3) Gap
phase 2 (G2), and the (4) Mitotic phase (M-phase) (See section 4.2 in
module).
Question 2
What is the role of the centriole during the cell cycle?
Answer: A centriole is a short, cylindrical protein filament composed
of tubulin that plays a role in the formation of the mitotic spindle (See
section 4.2 in module).
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, Question 3
Why is the cell cycle control system important?
Answer: The cell cycle control system is essential for normal cellular
growth and development, which is achieved by controlling the timing
and rate of the cell cycle (See section 4.3 in module).
Question 4
Compare and contrast purines and pyrimidines and provide examples
of each.
Answer: Purines contain two carbon-nitrogen rings and four nitrogen
atoms, while the pyrimidines contain one carbon-nitrogen ring and
two nitrogen atoms. Adenine and guanine are purines, and thymine
and cytosine are pyrimidines (See section 4.1 in module).
Question 5
Describe the structure and arrangement of DNA.
Answer: DNA is a double helix, which means it is composed of two
helical strands. The two strands are held together by the ‘rungs’,
which are made of complementary pairs. The pairs are held together
by weak hydrogen bonds.
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PRACTICE QUESTIONS WITH VERIFIED
SOLUTIONS GRADED A+ TESTED AND
APPROVED!!!
Question 1
What are the four phases of the cell cycle?
Answer: (1) Gap phase 1 (G1), (2) DNA synthesis (S-phase), (3) Gap
phase 2 (G2), and the (4) Mitotic phase (M-phase) (See section 4.2 in
module).
Question 2
What is the role of the centriole during the cell cycle?
Answer: A centriole is a short, cylindrical protein filament composed
of tubulin that plays a role in the formation of the mitotic spindle (See
section 4.2 in module).
Page 1 of 11
, Question 3
Why is the cell cycle control system important?
Answer: The cell cycle control system is essential for normal cellular
growth and development, which is achieved by controlling the timing
and rate of the cell cycle (See section 4.3 in module).
Question 4
Compare and contrast purines and pyrimidines and provide examples
of each.
Answer: Purines contain two carbon-nitrogen rings and four nitrogen
atoms, while the pyrimidines contain one carbon-nitrogen ring and
two nitrogen atoms. Adenine and guanine are purines, and thymine
and cytosine are pyrimidines (See section 4.1 in module).
Question 5
Describe the structure and arrangement of DNA.
Answer: DNA is a double helix, which means it is composed of two
helical strands. The two strands are held together by the ‘rungs’,
which are made of complementary pairs. The pairs are held together
by weak hydrogen bonds.
Page 2 of 11
