BSC 108 Exam 3 300+ Questions and Answers (2026) | Complete Breakdown with Verified Answers | A+ Verified

BSC 108 Exam 3 300+ Questions and Answers
(2026) | Complete Breakdown with Verified
Answers | A+ Verified
• DNA is composed of ____ subunits. -✓✓Nucleotide



• DNA has a ____ backbone covalently bonded to _____-containing bases -✓✓Sugar-
phosphate
Nitrogen


• A DNA molecule contains how many strands of DNA?

These strands form what? This means that they are _____. -✓✓2
A double helix
Complementary


• What are the nitrogen-containing bases? -✓✓Adenine
Guanine
Thymine
Cytosine


• The nitrogen-containing bases of the two strands are held to each other by ____ -
✓✓Hydrogen bonds



• Adenine always pairs with _____ -✓✓Thymine



• Cytosine always pairs with _____ -✓✓Guanine



• How does a molecule of DNA replicate? -✓✓One parent molecule that has two
complementary strands separates

, Each strand is used as a template to make a new strand
Each of the two daughter molecules will be composed of one "old" (parent) strand and
one "new" strand


• The two parent strands separate at the ____ -✓✓Origin of replication


• Synthesis of two new complementary strands occurs in the _____ using the ____ as
templates -✓✓Replication bubble
Parent strands


• The replication bubbles merge as DNA replication progresses in both directions at the
______ -✓✓Replication forks



• An organism's DNA leads to specific traits by _____ -✓✓Dictating the synthesis of
proteins


• What is the structure of RNA? -✓✓Ribose + A nitrogenous base + A phosphate group
(A, G, C, U)


• ____ is a single-stranded nucleic acid -✓✓RNA



• RNA contains ____ instead of thymine -✓✓Uracil



• RNA contains ____ instead of deoxyribose -✓✓Ribose



• What are the 3 types of RNA? -✓✓mRNA
tRNA
rRNA