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Flashcards in C5 DNA Deck (19):
1

Observed that heat-killed virulent cells could transform nonvirulent cells into virulent cells

Griffith

2

Griffith injected ? into mice

S. Pneumoniae

3

Gave first evidence that DNA could serve as genetic material

Avery, Macleod

4

The transforming principle was developed by ?

Griffith

5

The nature of the transforming principle was verified by ?

Avery, Macleod

6

How was the experiment by Avery, Macleod conducted

Fractionized S-strain cells into major macromolecules. DNA was only macromolecule that transformed R-strain.

7

Hershey-chase experiment was conducted using ? virus

T2

8

How was Hershey-chase experiment conducted?

DNA of virus was fluorescently labeled with one color, and protein with another. Allowed virus to infect E. Coli. DNA only present in infected bacteria.

9

typical size of cell

10 um

10

typical size of nucleus

5-8 um

11

Does chromosome number have an effect on organism complexity?

no

12

the most densely packaged region of chromosomes

heterochromatin

13

complex of DNA and proteins is called

chromatin

14

DNA is initially packaged by basic proteins known as ?

histones

15

Each histone condenses DNA by

3 times

16

DNA wraps around the histone ? times

1.65

17

This histone helps pack nucleosomes to make 30 nm fiber

H1

18

X-activation is a result of

one x-chromosome being completely condensed into heterochromatin

19

epigenetic control

DNA and/or histones can be modified to mark regions for gene expression