NVCC BIO 101 EXAM 3 ACTUAL EXAM 100 REAL EXAM QUESTIONS AND CORRECT DETAILED ANSWERS
What are the 3 characteristics of DNA? - (answer) 1. Must be able to code for the sequence of amino
acids in proteins and control protein synthesis
2. Must be able to replicate itself prior to cell division
3. Must be able to change over time to account for evolutionary change (evolution)
Is this statement correct? Two kinds of molecules participate in protein synthesis: deoxyribonucleic acid
(DNA) and ribonucleic acid (RNA). - (answer) True
Is this statement correct? The purines, cytosine, thymine, and uracil, have a single-ring structure. -
(answer) False: They are not Purines
Is this statement correct? Deoxyribonucleic (DNA) acid has one less hydroxyl group than ribonucleic acid
(RNA) - (answer) True
Is this statement correct? Each strand of DNA is oriented such that the 3' carbons of deoxyribose in one
strand are oriented in the opposite directions from the 3' carbons in the other strand, thus, the two
strands of DNA have opposite orientations and the DNA molecule is said to be antiparallel. - (answer)
True
Is this statement correct? In a DNA molecule, adenine always bonds to thymine, and cytosine always
bonds with guanine - (answer) True
Is this statement correct? Thymine is not present in a DNA molecule. - (answer) False: It's present
ONLY in DNA
Is this statement correct? There is a triple bond between cytosine and guanine and a double bond
between adenine and thymine. Both bonds are hydrogen bonds and, coupled with hydrophobic forces,
help the DNA molecule remain together. - (answer) True
, NVCC BIO 101 EXAM 3 ACTUAL EXAM 100 REAL EXAM QUESTIONS AND CORRECT DETAILED ANSWERS
Replication of DNA requires the existing double helix to separate into two template strands. This
separation is accomplished by: - (answer) Helicase
Where (what site) does DNA separation happen? - (answer) Replication Fork (Origin) of the Replication
Site
After the DNA strands have been separated ___ stabilizes the individual strands so that replication can
continue. - (answer) Topoisomerase
___ assembles an RNA primer at the origin of the replication site. - (answer) Primase
Is this statement correct? DNA polymerase adds new nucleotides to RNA primer. The DNA nucleotides
are collected from the cell's cytoplasm. - (answer) True
The RNA primer is removed and replaced with an appropriate sequence of DNA nucleotides. Which
enzymes help to directly facilitate this process? - (answer) Nucleotide Replacement Enzymes
Regarding DNA replication: One strand is replicated continuously toward the unwinding site and the
other strand is replicated discontinuously in the other direction with the formation of a series of short
segments called Okazaki fragments. Which strand contains the Okazaki fragments? - (answer) The
Lagging Strand
Which enzymes are responsible for strengthening the bonds present in the "the backbone" of the DNA
molecule? - (answer) Ligase
Is this statement correct? When DNA polymerase enters the process of replication, it moves from 5' to
3' (continuously) on the leading strand. - (answer) True
A ___ can be defined as a sequence of bases in DNA that codes for the synthesis of one polypeptide. -
(answer) Codon
What are the 3 characteristics of DNA? - (answer) 1. Must be able to code for the sequence of amino
acids in proteins and control protein synthesis
2. Must be able to replicate itself prior to cell division
3. Must be able to change over time to account for evolutionary change (evolution)
Is this statement correct? Two kinds of molecules participate in protein synthesis: deoxyribonucleic acid
(DNA) and ribonucleic acid (RNA). - (answer) True
Is this statement correct? The purines, cytosine, thymine, and uracil, have a single-ring structure. -
(answer) False: They are not Purines
Is this statement correct? Deoxyribonucleic (DNA) acid has one less hydroxyl group than ribonucleic acid
(RNA) - (answer) True
Is this statement correct? Each strand of DNA is oriented such that the 3' carbons of deoxyribose in one
strand are oriented in the opposite directions from the 3' carbons in the other strand, thus, the two
strands of DNA have opposite orientations and the DNA molecule is said to be antiparallel. - (answer)
True
Is this statement correct? In a DNA molecule, adenine always bonds to thymine, and cytosine always
bonds with guanine - (answer) True
Is this statement correct? Thymine is not present in a DNA molecule. - (answer) False: It's present
ONLY in DNA
Is this statement correct? There is a triple bond between cytosine and guanine and a double bond
between adenine and thymine. Both bonds are hydrogen bonds and, coupled with hydrophobic forces,
help the DNA molecule remain together. - (answer) True
, NVCC BIO 101 EXAM 3 ACTUAL EXAM 100 REAL EXAM QUESTIONS AND CORRECT DETAILED ANSWERS
Replication of DNA requires the existing double helix to separate into two template strands. This
separation is accomplished by: - (answer) Helicase
Where (what site) does DNA separation happen? - (answer) Replication Fork (Origin) of the Replication
Site
After the DNA strands have been separated ___ stabilizes the individual strands so that replication can
continue. - (answer) Topoisomerase
___ assembles an RNA primer at the origin of the replication site. - (answer) Primase
Is this statement correct? DNA polymerase adds new nucleotides to RNA primer. The DNA nucleotides
are collected from the cell's cytoplasm. - (answer) True
The RNA primer is removed and replaced with an appropriate sequence of DNA nucleotides. Which
enzymes help to directly facilitate this process? - (answer) Nucleotide Replacement Enzymes
Regarding DNA replication: One strand is replicated continuously toward the unwinding site and the
other strand is replicated discontinuously in the other direction with the formation of a series of short
segments called Okazaki fragments. Which strand contains the Okazaki fragments? - (answer) The
Lagging Strand
Which enzymes are responsible for strengthening the bonds present in the "the backbone" of the DNA
molecule? - (answer) Ligase
Is this statement correct? When DNA polymerase enters the process of replication, it moves from 5' to
3' (continuously) on the leading strand. - (answer) True
A ___ can be defined as a sequence of bases in DNA that codes for the synthesis of one polypeptide. -
(answer) Codon
