DNA Practice - Part 1: DNA Structure

Label the following parts in the DNA molecule using the word bank: A. Hydrogen Bond, B. Phosphate, C. Deoxyribose, D. Nitrogenous Base, E. Nucleotide.

• A. Hydrogen Bond

• B. Phosphate

• C. Deoxyribose

• D. Nitrogenous Base

• E. Nucleotide

How many molecules make up a nucleotide?

• 3.

• 2.

• 4.

• 5.

What two molecules make up the sides of a DNA molecule?

• Phosphate & Deoxyribose.

• Amino Acids & Proteins.

• Lipids & Carbohydrates.

• Nucleotides & Sugars.

What type of sugar does DNA contain?

• Deoxyribose.

• Ribose.

• Glucose.

• Fructose.

If a section of DNA contains 123,098 guanine molecules, how many cytosine molecules does it contain?

• 123,098!

• 123,000

• 120,000

• 125,000

Chargaff made an important discovery about DNA now called Chargaff’s rules. The rules are the amount of adenine always equals the amount of thymine; and the amount of guanine always equals cytosine.

• The amount of adenine equals the amount of guanine

• The amount of adenine equals the amount of thymine

• The amount of guanine equals the amount of thymine

• The amount of cytosine equals the amount of thymine

If you found out 29% of your DNA was made up of Guanine, what else must be true?

• The amount of adenine is 29%, the amount of cytosine is 21%, the amount of thymine is 29%.

• The amount of thymine is 29%, the amount of cytosine is 29%, the amount of adenine is 21%.

• The amount of cytosine is 29%, the amount of adenine is 21%, the amount of thymine is 21%.

• The amount of adenine 39%, the amount of cytosine is 29%, the amount of thymine is 29%.

Use the DNA strand below to write its complimentary strand: T G A C C G A T G C C A T G C A T G A C

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

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

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

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

The primary function of DNA in cells is to:

• serve as a storage form for unused nucleotides

• occupy space in the nucleus to keep the nucleus from collapsing

• store information that tells the cells which proteins to make

• serve as template for making long, spiral carbohydrates

DNA make up chromosomes which are located in the:

• Ribosome

• Mitochondria

• Cytoplasm

• Nucleus