DNA Structure & Function

DNA stands for

• double nitrogen acid

• ribonucleic acid

• deoxynitrogenous acid

• deoxyribonucleic acid

DNA is composed of subunits called ___, linked together to form long chains.

• nitrogenous bases

• nucleotides

• hydrogen bonds

• phosphate groups

Each nucleotide consists of ___.

• deoxyribose

• a phosphate group

• a nitrogenous base

• all of these

In DNA, which of the following always pairs with adenine?

• adenine

• thymine

• cytosine

• guanine

What type of bonds hold the nitrogen bases together in a DNA molecule?

• carbon bonds

• hydrogen bonds

• nitrogen bonds

• sulfur bonds

The sugar in DNA is ___.

• ribose

• deoxyribose

• glucose

• sucrose

The process of making two identical copies of DNA from one original is classed ___.

• DNA replication

• RNA replication

• DNA reproduction

• DNA transcription

The enzyme ___ adds free nucleotides to the original nucleotides during replication.

• helicase

• polyase

• polymerase

• helium

What would be the complement for the following base sequence: AGATCT?

• CTCAGA

• TCTAGA

• GAGCTC

• CTCGAG

Watson and Crick discovered ___.

• the shape of DNA as a double helix

• human DNA is composed of billions of base pairs

• DNA carries genetic information

• that DNA replication is semi-conservative