BIO 181 Exam 2 | 87 Questions and Correct Answers (Verified Answers) | New 2026/27 Update | Graded A+

BIO 181 Exam 2 | 87 Questions and Correct
Answers (Verified Answers) | New 2026/27
Update | Graded A+

In eukaryotic cells the start codon for protein synthesis is ______. - ANSWERS
AUG


True/False
The DNA polymerase that replicates the parental strand of DNA reads the parental
DNA from 5' to 3" and makes a new DNA strand from 3' to 5'. - ANSWERS false


Which sugar is present in RNA? - ANSWERS ribose


True/False
During DNA replication (mutation) is greatly reduced by enzymes that proof read
the newly replicated DNA. - ANSWERS true


How many "stop" codons exist? - ANSWERS 3


In the ribosome, what pairs with the codon? - ANSWERS anticodon


List the two basic categories of nitrogenous bases in nucleic acids. - ANSWERS
purines and pyrimidines

, Which enzyme unwraps the double helix?
a. Helicase
b. DNA polymerase III
c. DNA polymerase I
d. Nucleosome

e. DNA ligase - ANSWERS a. helicase


In DNA, what does the nucleotide labeled as A pair with? - ANSWERS Thymine


True/False
The genetic code for the conversion of mRNA codons to proteins has redundancy.
- ANSWERS true


True/False
DNA replication in eukaryotes is sped up by multiple origins of replication. -
ANSWERS True


During mRNA maturation what is the name of the part of the mRNA that is
removed? - ANSWERS intron


True/False

Replication of DNA is semi-conservative. - ANSWERS true


True/False

Strands of the backbone of DNA are parallel? - ANSWERS false