DNA shit lolz

Question 1

What was Chargaffs discovery?

Answer 1

There is significant
DNA
variation
between
species,
thus DNA
could be
the genetic
material.

Question 2

What are chargaff’s rules?

Answer 2

First Rule:
[A] = [T] and [G] = [C]

Second Rule:
The composition of DNA varies between species

Question 3

What is the X-ray diffraction pattern of DNA?

Answer 3

• Helical structure
• Bases perpendicular to the length of the DNA molecule
• Double stranded

Question 4

What are pyrimidines?

Answer 4

Cytosine and thymine

Question 5

What are purines?

Answer 5

Adenine and guanine

Question 6

What is the difference between RNA and DNA molecular on the 2nd carbon?

Answer 6

OH group RNA

H group DNA

Question 7

What is the fromation of the polynecleotide?

Answer 7

Nucleotide
monomers are
joined together
with
phosphodiester
bonds to form a
polynucleotide
= nucleic acid

Question 8

What the formation of the phosphodiester bond?

Answer 8

The hydroxyl group (OH) on the 3rd carbon of one nucleotide reacts with
the phosphate group attached to the 5th carbon on another nucleotide.

Question 9

Which way are DNA and RNA synthesised?

Answer 9

5’ –> 3’

Question 10

What is the watson crick model of DNA stucture?

Answer 10

DNA has a double stranded helical structure
The sugar phosphate backbone is on the outside The bases are on the inside
Stabilised by hydrogen bonds
The two polynucleotide strands are orientated in opposite directions

Question 11

What did the model of the watson and crick provide?

Answer 11

a stimulus for deciphering the
genetic code

a possible mechanism for the
replication of DNA

Question 12

Why does your cell replicate its DNA?

Answer 12

Because your body needs to make more cells

for growth, repair, pregnancy etc