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MBG 2040 Set 5 with 100- correct answers 2025.
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MBG 2040 Set 5 with 100- correct answers 2025.
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answers 2025What did Frederick Griffith's experiment prove? - answer DNA is the
genetic material
What is a virulent? - answer A pathogen that is highly aggressive and can
lead to death
What was Griffith's experiment? - answer He used two strains of
pseumondias: a living, virulent strain (S), and a living, non-virulent strain
(R). mice injected with the S strain died, mice with the R strain were alive.
He heat killed the S strain, but that released naked DNA to the live R cells,
which picked up the DNA and killed the mice.
Conclusion of Griffith's experiment: - answer DNA is the transforming
principle
Avery, Macleod, Mccarty experiment: - answer demonstrated that DNA is
the genetic material because degradation of DNA led to a cessation of
bacterial transformation
What contribution did Levene make to our understanding of DNA
structure? - answer He determined that DNA consists of nucleotides.
Substance responsible for transformation is called the - answer
transforming principle
What is the transforming principle? - answer DNA
Who purified the transforming principle? - answer Avery, Macleod,
Mccarty
, What is the chemical nature of the transforming substance? - answer
DNase destroys the transforming substance, therefore the transforming
substance is DNase
If Avery, MacLeod, and McCarty had found that samples of heat-killed
bacteria treated with RNase and DNase transformed bacteria but that
samples treated with protease did not, what conclusion would they have
drawn? - answer Protease carries out transformation.
Method for analyzing the three-dimensional shape and structure of a
chemical substance in which crystals of the substance are bombarded with
X-rays, which hit the crystals, bounce off, and produce a pattern of spots
on a detector. The pattern of the spots produced on the detector provides
information about the molecular structure. - answer X ray diffraction
Each nucleotide containes - answer sugar, phosphate, nitrogenous base
What did Watson and Crick use to help solve the structure of DNA? -
answer X-ray diffraction images
Laws of structural chemistry
Models of DNA
In most organisms, DNA carries the genetic information, but some viruses
use: - answer RNA
Heinz Fraenkel-Conrat and Bea Singer, who worked with the tobacco
mosaic virus (TMV) to discover: - answer If RNA or protein carries the
genetic material in TMV
When TMV was infected with hybrids, what was the conclusion? - answer
RNA is the genetic material
The ________ structure of DNA consists of a string of nucleotides joined
together by phosphodiester linkages. - answer primary
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