DNA Structure and History

What are the 4 bases that make up the rungs of the DNA ladder?

• adenine, guanine, thymine, cytosine

• xanthine, cafeine, cytarabine, gemcitabine,

• hypoxanthine, theobromine, fluorouracil, paclitaxel

• adenine, guanine, cytosine, urical

What is the shape of DNA?

• triple helix

• single stranded

• double helix

• braided spiral

What was Watson and Crick's main scientific accomplishment?

• Building the first accurate model of DNA

• Isolating strains of pneumonia causing bacteria

• Determining base pairing rules

• Discovering the process of genetic transformation

Who is responsible for producing this image?

• Francis Crick

• James Watson

• Rosalind Franklin

• Watson and Crick

Match the letter to the part.

a

b

c

d

e

Deoxyribose Sugar

Hydrogen Bonds

Phosphate

Covalent Bond

Nitrogen Base

Tags

112.42.c.7.A

What did Erwin Chargaff conclude from his experiments?

• Nitrogen bases are held together by peptide bonds

• A and T, C and G always occur in equal amounts

• Proteins are the carriers of genetic information

• C and G rarely occur in eukaryotic organisms

What are the 4 nitrogen bases?

• adenine, thymine, cytoplasm, and guanine

• adenine, thymine, cytosine, and guanine

• adenine, thymine, cytosine, and gylcerol

• adenine, thymine, cytosine, and glucose

The complimentary sequence would be...

• ATG CGT GAC GAT

• UAC GCA CUG CUA

• TAC GCA CTG CTA

• TAC GTC GAT ATG

What are the three components of a nucleotide?

• sugar, hydrogen, nitrogen base

• sugar, oxygen, nitrogen base

• sugar, phosphate, nitrogen base

• sugar, phosphate, protein

A segment of DNA is called a

• chromosome

• gene

• amino acid

• protien