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1
Griffith found that extracts of dead pathogenic strains of a Strep bacterium can "transform" live harmless strains into live pathogenic strains.
A)True
B)False
2
Avery and co-workers discovered that the properties of the transforming principle resembled DNA in which of the following ways:
A)The transforming principle has the same chemistry as DNA.
B)The transforming principle exhibits the same behavior as DNA.
C)The transforming principle can be destroyed by DNA digesting enzymes.
D)All of the above
3
Avery's results indicating that DNA is the hereditary material was widely accepted and appreciated.
A)True
B)False
4
Hershey and Chase used radioactive isotopes to "label" the DNA and protein in bacteria that were purposely infected with viruses.
A)True
B)False
5
The conclusion of Hershey and Chase's experiment was that the genes that viruses use to specify new viruses are made of protein and not DNA.
A)True
B)False
6
Each nucleotide subunit of DNA consists of
A)deoxyribose.
B)phosphate group.
C)an organic base.
D)all of the above.
7
All of the nucleotide subunits in a DNA molecule have exactly the same structure.
A)True
B)False
8
The DNA molecule is a single-stranded molecule that is coiled like a spring.
A)True
B)False
9
The true structure of DNA was deduced by _______________ using Tinkertoy-like models of the base.
A)Rosalind Franklin
B)Watson and Crick
C)Chargaff
D)All of the above
10
In DNA, each chain in the helix is a complementary mirror image of the other.
A)True
B)False
11
DNA can potentially be copied by a process called
A)conservative replication.
B)semiconservative replication.
C)dispersive replication.
D)All of the above
12
The Messelson and Stahl experiment confirmed that the model that DNA replicates is in a ________________ manner.
A)conservative
B)semiconservative
C)dispersive
D)All of the above
13
An enzyme called DNA polymerase unwinds the DNA double helix in the process of replication.
A)True
B)False
14
The place where the parent DNA molecule becomes unzipped is called the
A)primer.
B)replicating fork.
C)leading strand.
D)lagging strand.
15
The enzyme that covalently links the lagging sections together once the primers have been removed is called
A)DNA polymerase.
B)helicase.
C)DNA ligase.
D)All of the above
16
There is only one way in which the genetic message is altered, which is by mutation.
A)True
B)False
17
Genetic mutations are very common.
A)True
B)False
18
Mutations are always inherited.
A)True
B)False
19
Some changes in a DNA sequence can result in a change in a single amino acid which results in a mutated protein that may not function the same as the normal protein.
A)True
B)False
20
The hypothesis that chemicals cause cancer was first advanced in 1761.
A)True
B)False





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