Biology Chapter 16 Flashcards Preview

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Flashcards in Biology Chapter 16 Deck (23):
1

What bacteria did Frederick Griffith work with in 1928?

Streptococcus

2

What did Frederick Griffith's work with streptococcus Show?

A chemical could change harmless bacteria into pathogenic bacteria

3

Pathogenic means

Disease causing

4

Which strain killed mice?

The smooth strain

5

Which strain did not kill mice?

The rough strain

6

If Frederick Griffith mixed dead smooth bacteria with live rough bacteria what happened?

The mice died and had live smooth bacteria in them

7

Scientifically, how did the mice die?

The rough bacteria had absorbed DNA from the dead smooth ones, which changed the rough strain into the deadly smooth strain

8

When did Barbara McClintock show that genes are on chromosomes?

1941

9

In 1941 what did Barbara McClintock Show?

That genes are on chromosomes

10

When did Alfred Hershey and Martha Chase use viruses labeled with radioactivity to show that DNA is the genetic material?

1952

11

Alfred Hershey and Martha Chase used viruses labeled with radioactivity to show that

DNA is the genetic material

12

When did Rosalind Franklin, James Watson, and Francis Crick use X-Ray diffraction to work out the structure of DNA?

1953

13

Rosalind Franklin, James Watson, and Francis Crick used X-Ray diffraction to

Work out the structure of DNA

14

During interphase, before mitosis or meiosis, the DNA is copied inside the

Nucleus

15

When did Matthew Meselson and Franklin Stahl use bacteria to show that DNA replication was semi-conservative?

1957

16

Matthew Meselson and Franklin Stahl used bacteria to show

That DNA replication is semi-conservative

17

What does semi-conservative mean?

Each new pair of DNA strands contains one old strand and one new one

18

What is the first step of DNA replication?

The two strands of DNA separate

19

What is the second step of DNA replication?

Each strand acts as a template (or model) for a new DNA strand

20

What is the third step of DNA replication?

The enzyme DNA polymerase forms new DNA sections working from the 3' (3 prime) end of the original DNA to the 5' (5 prime) end

21

What is the fourth step of DNA replication?

DNA ligase joins together the Okazaki fragments

22

What is the fifth step of DNA replication?

Nucleus enzymes correct any mistakes in the DNA

23

When did Frederick Griffith work with bacteria?

1928