What are the main functions of DNA polymerase?

• breaks hydrogen bonds and exposes bases.

• holds DNA strands apart and attracts bases.

• zips and unzips the double-stranded DNA.

• binds nucleotides and corrects base pair errors.

Which of the following events occurs directly after a DNA molecule is unzipped?

• Mismatched nucleotide bases are identified and replaced

• Free-floating nucleotides pair up with exposed bases.

• Identical double-stranded DNA molecules are formed

• Enzymes break hydrogen bonds between base pairs.

The process of making new DNA molecules is semiconservative. This means that every new DNA molecule is composed of

• two completely identical strands of DNA.

• one original and one new strand of DNA.

• one strand of DNA and one strand of RNA.

• two strands that mix original and new DNA.

When new DNA molecules are formed, almost all errors are detected and fixed by

• the correct nucleotide.

• the sugar-phosphate backbone.

• DNA polymerase.

• one DNA strand

The process that makes an exact copy of a cell’s DNA is called

• conservation

• preservation

• replication

• synthesis