KW HHB Unit 1 Structure and Replication of DNA

DNA consists of nucleotides. What are the components of a DNA nucleotide?

• ribose sugar, phosphate and base

• deoxyribose sugar, phospholipid and base

• deoxyribose sugar, phosphate and base

• ribose sugar, phospholipid and base

An individual strand of DNA is held together by a strong chemical bond between the phosphate of one nucleotide and the carbon 3 of the sugar on another nucleotide. What is this known as?

• base - phosphate backbone

• deoxyribose - phosphate backbone

• phosphate - sugar backbone

• sugar - phosphate backbone

What base does adenine pair with in DNA?

• thymine
• uracil

• cytosine

• guanine

What base does guanine pair with in DNA?

• cytosine
• adenine

• thymine

• uracil

How are bases held together in a DNA molecule?

• by hydrogen bonds

• by strong bonds

• by sugar - phosphate bonds

• by sulphur bonds

DNA is double stranded

• False

• True

What term describes the fact that one strand of DNA goes from 5’ to 3’ and the opposite strand goes from 3’ to 5’?

• Complementary

• Opposite

• Parallel

• Antiparallel

What term describes the shape of DNA?

• single helix

• double helix

• helix

• complementary

The base sequence of DNA forms the ....................... code.

• genetic
• amino acid

• peptide

• deoxyribose

What is the name of the molecule which is required to replicate DNA?

• DNA polymerase

• RNA polymerase

• Polymerase

• Ligase