Unit 3: Lesson 3 - DNA and RNA

What makes up the SIDES of a DNA ladder?

• nitrogen bases

• sugars & phosphates

• genes & chromosomes

• RNA

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

• sugars & phosphates

• nitrogen bases

• sugars

• genes & chromosomes

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Which of the following best describes a DNA molecule?

• double helix

• contains ribose

• made of amino acids

• contains Uracil

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Nitrogenous bases are joined by which type of bond?

• polar bonds

• ionic bonds

• covalent bonds

• hydrogen bonds

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What are the three components of a nucleotide?

• sugar, hydrogen, nitrogen base

• sugar, oxygen, nitrogen base

• sugar, phosphate, nitrogen base

• sugar, phosphate, protein

Cytosine always pairs with

• Adenine

• Thymine

• Uracil

• Guanine

What is the complement to the DNA strand below:
5'-ATGCCAT-3'

Answer explanation

complimentary strand of DNA is the "other side" of the DNA that matches with the bases they gave you!

Think:

A --> T

C --> G

What is the significance of the sequence (order) of the Nitrogen Bases in DNA?

• The order of the Nitrogen Bases determines the number of chromosomes present in an organism.

• The order of the Nitrogen Bases determines the traits that an organism will possess (have).

• The order of the Nitrogen Bases determines the gender of an organism.

• The order of the Nitrogen Bases determines whether an organism is abiotic biotic.

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Assume that you have straight hair and your sibling has curly hair. What accounts for this difference?

• You have DNA and your sibling does not.

• Your sequence of nitrogen bases is different than your sibling.

• Your sibling has a weave. 

• Your sibling has a genetic mutation. 

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Why is DNA important?

• it is very small and very complicated

• it's in everything

• it serves as the blueprint for traits of all living things

• because we eat it every day for energy

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