Bio 170 Exam 2
Comprehensive Questions
with Verified Answers
Graded A+
1. Nucleotides are composed of Answer: phosphate, sugar, base
2. Adenine always pairs with Answer: Thymine (T) (2 hydrogen bonds)
3. Cytosine always pairs with Answer: Guanine (G) (3 hydrogen bonds)
4. adenine and guanine Answer: purine bases (pair with pyrimidine bases)
5. thymine and cytosine Answer: pyrimidine bases (pair with purine bases)
6. RNA Answer: A single-stranded nucleic acid that passes along genetic messages (uracil replaces
thymine here)
7. Replication Answer: Copying process by which a cell duplicates its DNA prior to cell division
8. Enzyme Helicase Answer: unwinds and separates the 2 DNA strands by breaking the weak
hydrogen bonds
1/
8
, 9. Enzyme Primase Answer: adds small RNA primer, helps jumpstart DNA polymerase, catalyzes
the formation of an RNA primer.
10. DNA polymerase III Answer: In charge of synthesizing nucleotides onto the leading
end in the classic 5' to 3' direction.
11. DNA polymerase I Answer: removes RNA primers and replaces them with DNA
12. Ligase Answer: An enzyme that connects two fragments of DNA to make a single fragmen
13. Central Dogma of Molecular Biology Answer: information is transferred from DN
to RNA to protein
DNA->(transcription)->RNA->(translation)-protein
2/
8
Comprehensive Questions
with Verified Answers
Graded A+
1. Nucleotides are composed of Answer: phosphate, sugar, base
2. Adenine always pairs with Answer: Thymine (T) (2 hydrogen bonds)
3. Cytosine always pairs with Answer: Guanine (G) (3 hydrogen bonds)
4. adenine and guanine Answer: purine bases (pair with pyrimidine bases)
5. thymine and cytosine Answer: pyrimidine bases (pair with purine bases)
6. RNA Answer: A single-stranded nucleic acid that passes along genetic messages (uracil replaces
thymine here)
7. Replication Answer: Copying process by which a cell duplicates its DNA prior to cell division
8. Enzyme Helicase Answer: unwinds and separates the 2 DNA strands by breaking the weak
hydrogen bonds
1/
8
, 9. Enzyme Primase Answer: adds small RNA primer, helps jumpstart DNA polymerase, catalyzes
the formation of an RNA primer.
10. DNA polymerase III Answer: In charge of synthesizing nucleotides onto the leading
end in the classic 5' to 3' direction.
11. DNA polymerase I Answer: removes RNA primers and replaces them with DNA
12. Ligase Answer: An enzyme that connects two fragments of DNA to make a single fragmen
13. Central Dogma of Molecular Biology Answer: information is transferred from DN
to RNA to protein
DNA->(transcription)->RNA->(translation)-protein
2/
8
