Summary of Structure of DNA

Question 1

Describe the DNA ladder

Answer 1

Handrails - Phosphate and sugar groups
Middle part - Bases.

Question 2

Two different families of bases

Answer 2

1.) Purine - double ringed
2.) Pyrimidine - single ringed

Question 3

T/F, purine goes with purine?

Answer 3

False, purines go with pyrimidines and vise versa. They are joined together by weak hydrogen bonds.

Question 4

What are the two purines?

Answer 4

Adenine and Guanine

Question 5

What are the two pyrimidines?

Answer 5

Cytosine and Thymine

Question 6

(T/F) Cytosine and Guanine have a triple bond

Answer 6

True, Cytosine and Guanine have a triple bond and Adenine and Thymine have a double bond.

Question 7

Define Hydrogen bonds

Answer 7

In between the base pairs of the two strands, holding the molecule together.

Question 8

What are DNA strands? Parellel and Anti Parellel?

Answer 8

They are anti parellel meaning one strand goes 5’ to 3’, the other strand goes 3’ to 5’.