Additional Scientists Flashcards

0
Q

Who’s work did Hotchkiss continue?

A

Avery-Macleod-McCaferty

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1
Q

What did Edwin Chargaff discover? (2 things)

A

Bases are not found in equal proportions

Base composition varied between species

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2
Q

What did Rollin Hotchkiss do?

A

Purified transforming material so that it contained only 0.02% protein

The transforming ability was retained

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3
Q

What did Hotchkiss work show?

A

That genetic traits other than r-strain and s-strain could be transferred by DNA

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4
Q

What question did Hersey-chase experiment answer? What was the answer?

A

Do the genes reside in DNA or protein?

DNA

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5
Q

Describe the first Hershey-chase experiment

A

The protein coat was labeled specifically with 35-sulfur

Attachment of phage to host cell

Removal of page coats by blending

Resulting in Cell containing little 35S-labeled protein plus unlabeled DNA

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6
Q

Describe the second Hershey-chase experiment

A

DNA is labeled specifically with 32 phosphorous protein

Attachment of phage to host cell

Removal of phage coats by blending

Resulted in cell containing little 32P-labeled protein

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7
Q

What do phases do in the host cell?

A

Enter the host cell and direct the synthesis of new phage particles

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8
Q

What are phases composed of?

A

Only DNA and protein

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9
Q

The _______ was used in the Hershey-chase experiments

A

T2 bacteriophage

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10
Q

What part of the phage was labeled with 32P?

A

Phage DNA

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11
Q

What part of the phage was labeled with 35-S

A

Phage protein

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12
Q

There is a lot of _______ in DNA and no ______

A

Phosphorous

Sulfur

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13
Q

There is a lot of _______ in phage protein and no _______

A

Sulfur

Phosphorous

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14
Q

What amino acids contain sulfur?

A

Methionine and cysteine

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15
Q

What did Watson and crick publish in 1953?

A

The double-helical model of DNA structure

16
Q

What are most genes made up of?

A

Nucleic acid, mostly DNA