Avery, MacLeod, and McCarty (1944)demonstrated That DNA Was the Molecule

question 32

Multiple Choice

Avery, MacLeod, and McCarty (1944) demonstrated that DNA was the molecule of heredity by treating heat killed Streptococcus pneumoniae S (smooth) strain with DNase, thereby preventing transfer of the "transforming substance" from the killed S strain to the live R (rough) strain when the two were mixed together and injected into mice. Another way that one could demonstrate transformation in bacteria would be to extract DNA from

• A)an ampicillin- sensitive strain and mix with cells of an ampicillin- resistant strain.
• B)both S and R strains and mix to allow recombination to take place.
• C)a S strain and mix with cells of a R strain.
• D)a R strain and mix with cells of a S strain.
• E)none of the above

Describe common misconceptions in estimating Earth's age and the impact of new discoveries on these views.

Understand the role of molecular evidence in the fossil record.

Explain the diversification of life forms and their evolutionary relationships.

Distinguish between stable and unstable isotopes and their applications in geology.

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Definitions:

Hot Objects

Items that have absorbed or are emitting a high level of thermal energy, often perceivable through the sensation of heat upon contact.

Cold Objects

Items that are at a low temperature, potentially causing a decrease in temperature of anything they come into contact with.

Merkel Disks

Specialized skin cells that function as mechanoreceptors to sense touch and texture.

Pacinian Corpuscles

Specialized nerve endings in the skin and visceral organs sensitive to pressure and vibration.