ASU BIO 181 Exam 2 Question and
Answer 2026/2027 | Grade A+
• During DNA replication in the lagging strand there is production of this
component? -✓✓Okazaki fragment
• How many "stop" codons exist? -✓✓3
• The double helix of DNA is wrapped about 1¾ times around which of these
components? -✓✓Nucleosome
• Which enzyme unwraps the double helix? -✓✓Helicase
• In the ribosome, what is the name of the bond that links one amino acid to the
next? -✓✓peptide bonds
• List the two basic categories of nitrogenous bases in nucleic acids. -✓✓purine
and pyrimidine
• In DNA, what does the nucleotide labeled as A pair with? -✓✓Thymine
• During DNA replication is greatly reduced by enzymes that proof read the newly
replicated DNA. -✓✓True
• How many hydrogen bonds are there between an A and its paired nucleotide? -
✓✓2
• During mRNA maturation what is the name of the part of the mRNA that is
removed? -✓✓introns
• DNA replication in eukaryotes is sped up by multiple origins of replication. -
✓✓true
• RNA synthesis, also called RNA transcription occurs in three phases. List them
from beginning to end in order. -✓✓initiation, elongation, termination
, • Which nucleotide is different in RNA compared to DNA? -✓✓uridine
• There are two types of protein synthesis in eukaryotic cells. These two types can
be distinguished because the polyribosome is either or . -✓✓free; membrane bound
• In eukaryotic cells the start codon for protein synthesis is . -✓✓Aug
• Draw the sugar in DNA and label the carbons as discussed in the lecture. Then
circle the carbon that is different in RNA. -✓✓
• Which sugar is present in RNA? -✓✓ribose
• For DNA Polymerase III to work which of these components has to act first? -
✓✓Primase
• RNA is double stranded. -✓✓False
• In the lagging stand, the DNA is read from the parental DNA's 3' to 5' end. -
✓✓True
• Which enzyme is used first to permit DNA polymerase III to begin replicating the
3' strand? -✓✓Primase
• Strands of the backbone of DNA are parallel? -✓✓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'. -✓✓False
• Uridine is a nucleotide in DNA. -✓✓False
• List one type of post-translational modification -✓✓proteolysis
• Replication of DNA is semi-conservative. -✓✓True
• Protein synthesis changes from the language of to the language of . -
✓✓nucleotide; amino acid
Answer 2026/2027 | Grade A+
• During DNA replication in the lagging strand there is production of this
component? -✓✓Okazaki fragment
• How many "stop" codons exist? -✓✓3
• The double helix of DNA is wrapped about 1¾ times around which of these
components? -✓✓Nucleosome
• Which enzyme unwraps the double helix? -✓✓Helicase
• In the ribosome, what is the name of the bond that links one amino acid to the
next? -✓✓peptide bonds
• List the two basic categories of nitrogenous bases in nucleic acids. -✓✓purine
and pyrimidine
• In DNA, what does the nucleotide labeled as A pair with? -✓✓Thymine
• During DNA replication is greatly reduced by enzymes that proof read the newly
replicated DNA. -✓✓True
• How many hydrogen bonds are there between an A and its paired nucleotide? -
✓✓2
• During mRNA maturation what is the name of the part of the mRNA that is
removed? -✓✓introns
• DNA replication in eukaryotes is sped up by multiple origins of replication. -
✓✓true
• RNA synthesis, also called RNA transcription occurs in three phases. List them
from beginning to end in order. -✓✓initiation, elongation, termination
, • Which nucleotide is different in RNA compared to DNA? -✓✓uridine
• There are two types of protein synthesis in eukaryotic cells. These two types can
be distinguished because the polyribosome is either or . -✓✓free; membrane bound
• In eukaryotic cells the start codon for protein synthesis is . -✓✓Aug
• Draw the sugar in DNA and label the carbons as discussed in the lecture. Then
circle the carbon that is different in RNA. -✓✓
• Which sugar is present in RNA? -✓✓ribose
• For DNA Polymerase III to work which of these components has to act first? -
✓✓Primase
• RNA is double stranded. -✓✓False
• In the lagging stand, the DNA is read from the parental DNA's 3' to 5' end. -
✓✓True
• Which enzyme is used first to permit DNA polymerase III to begin replicating the
3' strand? -✓✓Primase
• Strands of the backbone of DNA are parallel? -✓✓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'. -✓✓False
• Uridine is a nucleotide in DNA. -✓✓False
• List one type of post-translational modification -✓✓proteolysis
• Replication of DNA is semi-conservative. -✓✓True
• Protein synthesis changes from the language of to the language of . -
✓✓nucleotide; amino acid
