BSC 108 EXAM 3 2026 ACTUAL EXAM PAPER
QUESTIONS WITH SOLUTIONS GRADED A+
◉ What is DNA composed of?
Answer: nucleotide subunits
◉ What is the backbone of DNA?
Answer: deoxyribose and a phosphate group
◉ What is the backbone of DNA covalently bonded to?
Answer: nitrogen-containing bases
◉ How many strands of DNA does a DNA molecule contain?
Answer: two
◉ The two strands of DNA are:
Answer: complementary
◉ What are the nitrogen-containing bases in DNA?
Answer: adenine, guanine, thymine, cytosine
,◉ How are the nitrogen-containing bases held together?
Answer: hydrogen bonds
◉ What bases pair together?
Answer: adenine=thymine
guanine=cytosine
◉ How does DNA replicate?
Answer: DNA molecule unwinds and each strand is a template for
complementary base pairing; each daughter helix contains an intact
strand from the parent helix and a newly synthesized strand
therefore DNA replication is semiconservative
◉ One parent molecule is composed of two __________________ that
separate.
Answer: complementary strands
◉ Each strand is used as a ______________ to make a new strand.
Answer: template
◉ What are the two daughter molecules composed of?
Answer: One "old" (parent) strand and one "new" (synthesized)
strand
, ◉ Where do parent strands separate?
Answer: origins of replication
◉ Where and how does synthesis of two new complementary
strands occur?
Answer: replication bubbles, using the parent strands as templates
◉ What do the replication bubbles do as DNA replication progresses
in both directions at the replication forks?
Answer: merge
◉ How does an organism's DNA lead to specific traits?
Answer: by dictating the synthesis of proteins
◉ What is the structure of RNA?
Answer: single-stranded nucleic acid
◉ RNA contains ________ instead of thymine.
Answer: Uracil
◉ What sugar is used in RNA?
QUESTIONS WITH SOLUTIONS GRADED A+
◉ What is DNA composed of?
Answer: nucleotide subunits
◉ What is the backbone of DNA?
Answer: deoxyribose and a phosphate group
◉ What is the backbone of DNA covalently bonded to?
Answer: nitrogen-containing bases
◉ How many strands of DNA does a DNA molecule contain?
Answer: two
◉ The two strands of DNA are:
Answer: complementary
◉ What are the nitrogen-containing bases in DNA?
Answer: adenine, guanine, thymine, cytosine
,◉ How are the nitrogen-containing bases held together?
Answer: hydrogen bonds
◉ What bases pair together?
Answer: adenine=thymine
guanine=cytosine
◉ How does DNA replicate?
Answer: DNA molecule unwinds and each strand is a template for
complementary base pairing; each daughter helix contains an intact
strand from the parent helix and a newly synthesized strand
therefore DNA replication is semiconservative
◉ One parent molecule is composed of two __________________ that
separate.
Answer: complementary strands
◉ Each strand is used as a ______________ to make a new strand.
Answer: template
◉ What are the two daughter molecules composed of?
Answer: One "old" (parent) strand and one "new" (synthesized)
strand
, ◉ Where do parent strands separate?
Answer: origins of replication
◉ Where and how does synthesis of two new complementary
strands occur?
Answer: replication bubbles, using the parent strands as templates
◉ What do the replication bubbles do as DNA replication progresses
in both directions at the replication forks?
Answer: merge
◉ How does an organism's DNA lead to specific traits?
Answer: by dictating the synthesis of proteins
◉ What is the structure of RNA?
Answer: single-stranded nucleic acid
◉ RNA contains ________ instead of thymine.
Answer: Uracil
◉ What sugar is used in RNA?
