Unit 5 : DNA Structure & Function

DNA is a polymer composed of repeating units called:

• proteins
• nucleotides
• sugars
• amino acids

What is the "backbone" of DNA composed of?

• lipids and carbohydrates
• proteins and enzymes
• amino acids and nucleotides
• sugar and phosphate molecules

The sugar and phosphate molecules of the DNA backbone is held together by _____ bonds?

• Weak Hydrogen

• Nitrogen

• Covalent

• Ionic

Purines are nitrogen bases that have 2 rings. Which two DNA nitrogen bases are categorized as purines?

• Adenine & Thymine

• Adenine & Guanine

• Cytosine & Thymine

• Cytosine & Guanine

The part of the nucleotide that makes up the "rungs of the DNA ladder" are:

• nitrogen bases

• phosphates

• 5-carbon sugar

• Hydrogen

What is the function of DNA?

• The function of DNA is to store and transmit genetic information.
• The function of DNA is to maintain cell structure.
• The function of DNA is to produce energy for the cell.
• The function of DNA is to regulate cell metabolism.

DNA has what type of shape?

• Triple helix
• Single strand
• Double helix
• Square shape

Where within the structure of a DNA molecule is the genetic code (the store of information for the synthesis of proteins)?

• Sequence of Nitrogen bases

• Within the 5-carbon sugar

• Along the phosphate groups

• In the covalent bonds

Replicate the following segment of DNA:

A T C C G A T G

• A T G C G A T G
• T A C G C T A C
• C T A G G C T A
• T A G G C T A C

The strands of a DNA molecule are anti-parallel meaning:

• The strands of a DNA molecule run in opposite directions.
• The strands of a DNA molecule are co-linear
• The strands of a DNA molecule are perpendicular
• The strands of a DNA molecule are parallel