BS 161 Exam – Questions With Efficient Solutions
When a mixture of debris from killed virulent bacteria and live
nonvirulent bacteria are injected into mice:
1. the mice are killed because the nonvirulent bacteria are
transformed into virulent bacteria.
2. the mice survive because none of the living bacteria are virulent.
3. the mice are killed because the virulent bacteria are revived.
4. half the mice are killed and the other half survive.
5. the mice survive for a period of a few weeks and then die from an
unrelated illness. Correct Answer - 1
Which one of the following is LEAST likely to be found in a
nucleotide?
1. a nitrogen-containing base
2. All of the choices are equally likely to be found in a nucleotide.
3. a side chain
4. one or more phosphate groups
5. a five-carbon sugar Correct Answer - 3
In a nucleotide, the phosphate is attached to the _____ carbon of the
sugar, and the base is attached to the _____ carbon of the sugar.
1. 5'; 3'
2. 3'; 5'
3. 2'; 3'
4. 1'; 5'
5. 5'; 1' Correct Answer - 5
Which one of the following represents an actual Watson-Crick base
pair with the LARGEST number of hydrogen bonds?
,1. thymine and guanine
2. cytosine and thymine
3. cytosine and guanine
4. adenine and cytosine
5. adenine and thymine Correct Answer - 3
Which type of protein does DNA wrap around so that it can be
packaged in a cell?
1. ribosomal proteins
2. DNA polymerase
3. histones
4. spliceosome proteins
5. topoisomerase Correct Answer - 3
In eukaryotes, activator proteins bind to _____; generalized
transcription factors bind to _____.
1. promoters; enhancers
2. promoters; terminators
3. terminators; RNA polymerases
4. DNA polymerases; RNA polymerases
5. enhancers; promoters Correct Answer - 5
Where does the energy come from to add a uracil to the 3' end of a
transcript?
1. the hydrolysis of all three phosphate groups from the incoming
UTP molecule
2. the hydrolysis of a terminal phosphate from the incoming UTP
molecule
3. the hydrolysis of pyrophosphate from the incoming UTP molecule
4. the cell's supply of ATP
, 5. the energy released by allowing the uracil to complementary base
pair with an adjacent thymine Correct Answer - 3
Which one of the following RNA types is MOST abundant in
mammalian cells?
1. rRNA
2. snRNA
3. tRNA
4. mRNA
5. miRNA Correct Answer - 1
Which one of the following statements about RNA is CORRECT?
1. All of these choices are correct.
2. RNA has the same 5-carbon sugars as DNA.
3. RNA is a more stable molecule than DNA.
4. RNA uses the same purine bases as DNA.
5. RNA uses the same pyrimidine bases as DNA. Correct Answer -
4
The poly(A) sequence that is added to RNA during processing:
1. helps prevent rapid breakdown of the messenger RNA.
2. aids in the accuracy of translation of the messenger RNA into
protein.
3. is needed for ribosomes to attach to messenger RNA.
4. helps prevent formation of complex three-dimensional structures
in the messenger RNA. Correct Answer - 1
Which of the following DNA molecules would be more stable under
conditions of increasing temperature?
When a mixture of debris from killed virulent bacteria and live
nonvirulent bacteria are injected into mice:
1. the mice are killed because the nonvirulent bacteria are
transformed into virulent bacteria.
2. the mice survive because none of the living bacteria are virulent.
3. the mice are killed because the virulent bacteria are revived.
4. half the mice are killed and the other half survive.
5. the mice survive for a period of a few weeks and then die from an
unrelated illness. Correct Answer - 1
Which one of the following is LEAST likely to be found in a
nucleotide?
1. a nitrogen-containing base
2. All of the choices are equally likely to be found in a nucleotide.
3. a side chain
4. one or more phosphate groups
5. a five-carbon sugar Correct Answer - 3
In a nucleotide, the phosphate is attached to the _____ carbon of the
sugar, and the base is attached to the _____ carbon of the sugar.
1. 5'; 3'
2. 3'; 5'
3. 2'; 3'
4. 1'; 5'
5. 5'; 1' Correct Answer - 5
Which one of the following represents an actual Watson-Crick base
pair with the LARGEST number of hydrogen bonds?
,1. thymine and guanine
2. cytosine and thymine
3. cytosine and guanine
4. adenine and cytosine
5. adenine and thymine Correct Answer - 3
Which type of protein does DNA wrap around so that it can be
packaged in a cell?
1. ribosomal proteins
2. DNA polymerase
3. histones
4. spliceosome proteins
5. topoisomerase Correct Answer - 3
In eukaryotes, activator proteins bind to _____; generalized
transcription factors bind to _____.
1. promoters; enhancers
2. promoters; terminators
3. terminators; RNA polymerases
4. DNA polymerases; RNA polymerases
5. enhancers; promoters Correct Answer - 5
Where does the energy come from to add a uracil to the 3' end of a
transcript?
1. the hydrolysis of all three phosphate groups from the incoming
UTP molecule
2. the hydrolysis of a terminal phosphate from the incoming UTP
molecule
3. the hydrolysis of pyrophosphate from the incoming UTP molecule
4. the cell's supply of ATP
, 5. the energy released by allowing the uracil to complementary base
pair with an adjacent thymine Correct Answer - 3
Which one of the following RNA types is MOST abundant in
mammalian cells?
1. rRNA
2. snRNA
3. tRNA
4. mRNA
5. miRNA Correct Answer - 1
Which one of the following statements about RNA is CORRECT?
1. All of these choices are correct.
2. RNA has the same 5-carbon sugars as DNA.
3. RNA is a more stable molecule than DNA.
4. RNA uses the same purine bases as DNA.
5. RNA uses the same pyrimidine bases as DNA. Correct Answer -
4
The poly(A) sequence that is added to RNA during processing:
1. helps prevent rapid breakdown of the messenger RNA.
2. aids in the accuracy of translation of the messenger RNA into
protein.
3. is needed for ribosomes to attach to messenger RNA.
4. helps prevent formation of complex three-dimensional structures
in the messenger RNA. Correct Answer - 1
Which of the following DNA molecules would be more stable under
conditions of increasing temperature?
