BIO 112 EXAM 2 PRACTICE
QUESTIONS WITH CORRECT
ANSWERS
DNA is found in the _____ of eukaryotic cells. - Correct Answers -nucleus
We inherit ______ chromosomes from our mother. - Correct Answers -23
Which is NOT part of a nucleotide?
a.
5 C sugar
b.
phosphate group
c.
fatty acid
d.
nitrogen containing base - Correct Answers -c. fatty acid
The 2 strands of DNA are held together by _______ bonds between the bases. -
Correct Answers -hydrogen
In DNA, the base G pairs with the base - Correct Answers -C
Which type of evidence is most reliable in identifying suspects?
a.
DNA
b.
bite mark analysis
c.
hair analysis
d.
eye witnesses - Correct Answers -a. DNA
,With the exception of identical twins, no two people share exactly the same order of
DNA nucleotides. True or false? - Correct Answers -True
DNA can be obtained from
a.
blood
b.
hair
c.
semen
d.
saliva
e.
all of these and most other human tissue - Correct Answers -e
In which of the following situations would PCR be most useful for a criminal defense
attorney?
a.
When more reliable pieces of evidence such as bite marks do not exist
b.
When no DNA exists at a crime scence
c.
When a DNA sample is contaminated
d.
When there is only a small amount of DNA at a crime scene - Correct Answers -d.
When there is only a small amount of DNA at a crime scene
Which statement about DNA replication and PCR is FALSE?
a.
PCR is similar to natural DNA replication, except that it takes place in lab and only
replicates specific regions of a DNA molecule.
b.
Both DNA replication and PCR use DNA polymerase.
c.
, Both can quickly copy large amounts of DNA.
d.
Both use high temperatures to separate DNA copies. - Correct Answers -d. Both use
high temperatures to separate DNA copies.
Steps to Replicate a DNA Sequence: ACTG - Correct Answers -DNA helix is unwound
DNA polymerase adds T
DNA polymerase adds G
DNA polymerase adds A
DNA polymerase adds C
Steps in PCR - Correct Answers -mix nucleotides primer enzyme
heat DNA to unwind
cool the sample
let DNA polymerase add bases
repeat
The most difficult part of DNA profiling is
a.
making enough copies of the DNA
b.
determining whether the DNA is the same as the suspect's
c.
extracting an uncontaminated sample to start PCR
d.
finding a cell that contains DNA - Correct Answers -c.
extracting an uncontaminated sample to start PCR
One person's STRs are different from another person's STRs because STRs from
different people
a.
are instructions for different characteristics
b.
have a different sequence of A, G, C and T
c.
are repeated a different number of times
d.
QUESTIONS WITH CORRECT
ANSWERS
DNA is found in the _____ of eukaryotic cells. - Correct Answers -nucleus
We inherit ______ chromosomes from our mother. - Correct Answers -23
Which is NOT part of a nucleotide?
a.
5 C sugar
b.
phosphate group
c.
fatty acid
d.
nitrogen containing base - Correct Answers -c. fatty acid
The 2 strands of DNA are held together by _______ bonds between the bases. -
Correct Answers -hydrogen
In DNA, the base G pairs with the base - Correct Answers -C
Which type of evidence is most reliable in identifying suspects?
a.
DNA
b.
bite mark analysis
c.
hair analysis
d.
eye witnesses - Correct Answers -a. DNA
,With the exception of identical twins, no two people share exactly the same order of
DNA nucleotides. True or false? - Correct Answers -True
DNA can be obtained from
a.
blood
b.
hair
c.
semen
d.
saliva
e.
all of these and most other human tissue - Correct Answers -e
In which of the following situations would PCR be most useful for a criminal defense
attorney?
a.
When more reliable pieces of evidence such as bite marks do not exist
b.
When no DNA exists at a crime scence
c.
When a DNA sample is contaminated
d.
When there is only a small amount of DNA at a crime scene - Correct Answers -d.
When there is only a small amount of DNA at a crime scene
Which statement about DNA replication and PCR is FALSE?
a.
PCR is similar to natural DNA replication, except that it takes place in lab and only
replicates specific regions of a DNA molecule.
b.
Both DNA replication and PCR use DNA polymerase.
c.
, Both can quickly copy large amounts of DNA.
d.
Both use high temperatures to separate DNA copies. - Correct Answers -d. Both use
high temperatures to separate DNA copies.
Steps to Replicate a DNA Sequence: ACTG - Correct Answers -DNA helix is unwound
DNA polymerase adds T
DNA polymerase adds G
DNA polymerase adds A
DNA polymerase adds C
Steps in PCR - Correct Answers -mix nucleotides primer enzyme
heat DNA to unwind
cool the sample
let DNA polymerase add bases
repeat
The most difficult part of DNA profiling is
a.
making enough copies of the DNA
b.
determining whether the DNA is the same as the suspect's
c.
extracting an uncontaminated sample to start PCR
d.
finding a cell that contains DNA - Correct Answers -c.
extracting an uncontaminated sample to start PCR
One person's STRs are different from another person's STRs because STRs from
different people
a.
are instructions for different characteristics
b.
have a different sequence of A, G, C and T
c.
are repeated a different number of times
d.
