3.When Watson and Crick built and proposed the DNA structure, they determined three important features. What were the three features they proposed? Select all that apply.
Multiple select question.
A) Two outside strands consist of alternating deoxyribose and phosphate.

B) Two outside strands consist of alternating ribose and phosphate.

C) Guanine and cytosine bases pair to each other by two hydrogen bonds.

D) Guanine and cytosine bases pair to each other by three hydrogen bonds.

E) Guanine and adenine bases pair to each other by three hydrogen bonds.

F) Cytosine and thymine bases pair to each other by two hydrogen bonds.

G) Adenine and thymine bases pair to each other by three hydrogen bonds.

H) Adenine and thymine bases pair to each other by two hydrogen bonds.