DNA Structure

Cytosine always pairs with

• Adenine
• Thymine
• Uracil
• Guanine

Which is NOT one of the three parts of a nucleotide?

• sugar

• base

• ribosome

• phosphate

Challenge- How many TOTAL NUCLEOTIDES are there in the DNA molecule pictured?

• 5

• 10

• 2

• 20

What scientists were credited with discovering the structure of DNA?

• Einstein and Darwin

• Watson and Crick

• Wallace and Cooper

• Wegener and Chargoff

What makes up the SIDES of a DNA ladder?

• nitrogen bases

• sugars & phosphates

• genes & chromosomes

• RNA

What are the three components of a nucleotide?

• sugar, hydrogen, nitrogen base
• sugar, oxygen, nitrogen base
• sugar, phosphate, nitrogen base
• sugar, phosphate, protein

What is DNA made up of?

• nucleotides

• cytoplasm

• RNA

• cells

What makes up the rungs (steps) of a DNA ladder?

• sugars & phosphates

• nitrogen bases

• sugars

• genes & chromosomes

Fill in the matching bases that would appear on the top strand of the DNA molecule pictured, in order.

A G T C A T G A

• A G T C A T G A

• T T T A A A C C

• T C A G T A C T

• C A T G A G A T

If one strand of a DNA molecule has the following order of bases, what will be the correct order of bases on the complementary (matching) strand?

AATTGGCC

• AATTGGCC

• TTAACCGG

• GGCCAATT

• GACTGACT