Bio1, Ch12 History, structure, and replication of DNA

Erwin Chargaff's rule of base pairing states that:

• adenine pairs with thymine and guanine pairs with cytosine

• adenine pairs with guanine and thymine pairs with cytosine

• purines pair with pyrimidines

• pyrimidines pair only with pyrimidines

Rosanlind Franklin's x-ray diffraction image of her study of DNA was noticed by Watson and Crick and led them to model what they thought the shape and structure of DNA was. What was that shape?

• the double helix

• the single strand

• the sugar and phosphate

• the four nitrogen bases

Thymine, adenine, guanine, cytosine, and uracil are classified as:

• sugars

• codons

• nitrogen bases

• nucleotides

What is the backbone of this DNA molecule made of?

• sugars

• nitrogen bases

• sugar and phosphate

• sugar and nitrogen bases

What type of bonds hold together nitrogen bases?

• water bonds

• covalent bonds

• peptide bonds

• hydrogen bonds

Using the bases on the template strand of DNA, what are the new complimentary bases for replication? Template: AGTCA

• AGTCA

• TCAGT

• UCAGU

• TCUGT

What enzyme unzips the DNA strands to allow replication to occur?

• polymerase

• ligase

• helicase

• primase

Semi-conservative replication of DNA refers to the idea that___.

• the two strands of DNA molecules run in opposite directions.

• each new DNA molecule contains 2 new single RNA strands.

• each half of the original DNA molecule is joined with a new complementary DNA strand.

• DNA molecules need to unwind before duplication begins.

A monomer of DNA is called a(n)

• Monosaccharide
• Amino Acid
• Triglyceride
• Nucleotide

Which of the following best describes a DNA molecule?

• double helix
• contains ribose
• made of amino acids
• contains Uracil