nucleic acids

Question 1

what are nucleotides?

Answer 1

they are the monomers for nucleic acids.
they contain three basic components:
-pentose sugar
-nitrogenous base
-phosphate group

Question 2

what are the complementary base pairs?

Answer 2

DNA:
C and G
A and T
RNA:
C and G
A and U

Question 3

what did watson and crick do?

Answer 3

they discovered the structure of DNA in 1953. they used previous experiments and trial and error. they developed a model that showed that DNA is a double helix structure, with anti-parallel strands.

Question 4

what is the difference between the structure of DNA, and RNA?

Answer 4

the difference is on carbon 2, and RNA has OH, and DNA has only H

Question 5

how many hydrogen bonds are between C and G?

Answer 5

3

Question 6

how many hydrogen bonds are between A and T?

Answer 6

2

Question 7

what is the process of DNA replication? messsolson and stahl

Answer 7

1. bacteria is grown in a culture of N15. the bacteria takes on its environment, to form its DNA
2. the DNA is extracted from the bacteria, and centrifuged showing 100% N15 bases.
3. the DNA is then put in a N14 solution, for 20 minutes.
4. the new N14 babes attach to either parent strand of the N15.
5. this brings about 50% N14, and N15.
6. during the second replication the DNA, is again put in the N14 culture, where the four strands unzip and become parent strands.
7. 2 fully N14 double strands are formed and 2 double strands of N14, and N15 are formed.
8. again, the DNA is centrifuged and it 75% N14, and 25% N15.

Question 8

what is the method of DNA replication?

Answer 8

semi-conservative replication