PBS 1.2 What Is DNA?: Question Preview (ID: 26920)


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A restriction enzyme cuts DNA three times. How many fragments are formed?
a) 2 b) 3 c) 4 d) 5
When looking at the results of the gel electrophoresis, you find that Suspect 6 and the crime scene results have the exact pattern. What does this mean?
a) Suspect 6 was at the crime scene. b) Suspect 6 is definitely guilty. c) Suspect 6 was not at the crime scene. d) Suspect 6 is definitely innocent.
When looking at the results of a gel electrophoresis, Suspect 1 and the crime scene have no bands in common. What does this mean?
a) Suspect 1 was not at the crime scene. b) Suspect 1 is definitely guilty. c) Suspect 1 is definitely innocent. d) Suspect 1 was at the crime scene.
Thymine always pairs with ____ in DNA.
a) Adenine b) Cytosine c) Thymine d) Guanine
Guanine always pairs with ____ in DNA.
a) Adenine b) Thymine c) Guanine d) Cytosine
RFLP's move on the gel because of their
a) Charge and size b) Charge only c) Size only d) None of the above
The pieces that move farther during electrophoresis move more because they have
a) Lots of base pairs b) Fewer base pairs c) No base pairs d) Fragments don't move
Each of the following is an RFLP. Which one would travel the FARTHEST distance on the gel?
a) 15 bp b) 30 bp c) 60 bp d) 90 bp
Each of the following is an RFLP. Which of the following would travel the SHORTEST distance on the gel?
a) 15 bp b) 30 bp c) 60 bp d) 90 bp
You just added restriction enzymes to the sample. What will the enzymes do to the DNA?
a) Draw the DNA out of the solution b) Make lots of copies of it c) Separate the RFLP's d) Cut it into pieces at specific points
The small black dot in a DNA diagram represents
a) phosphate b) deoxyribose c) thymine d) adenine
The pentagon in a DNA diagram represents
a) phosphate b) deoxyribose c) thymine d) sugar
Deoxyribose sugar, phosphate, and a nitrogen base make up a
a) nucleus b) nucleolus c) nucleotide d) nuclear
Structurally, which other component is guanine most similar to?
a) Phosphate b) Adenine c) Cytosine d) Deoxyribose
You are a DNA analyst. A small sample of DNA was recovered from a crime scene. You need to analyze it. Your first step is to do what?
a) Compare the RFLP's b) Run a gel c) Add restriction enzymes d) Perform PCR to make copies
What is the charge of DNA?
a) Always positive b) Always negative c) Always neutral d) It depends on whose it is
What is Chargaff's rule?
a) The backbone of DNA is the same for every living thing b) Adenine pairs with thymine and guanine with cytosine c) DNA has the shape of a double helix d) All bases are pyrimidines or purines
If a DNA strand has a sequence of GCCATA, what is the sequence of the complimentary strand?
a) CGTAGA b) CGGTAT c) TAGGAC d) GTGATT
Which of these bonds are the weakest?
a) bond between phosphate and a deoxyribose sugar b) bond between adenine and thymine c) bond between deoxyribose and cytosine d) bond between guanine and deoxribose
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