DNA Structure & History

What makes up the sides of the DNA ladder?

• nitrogen bases

• genes & chromosomes

• sugars & phosphates

• RNA

Tags

NGSS.HS-LS1-1

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

• nitrogen bases

• genes & chromosomes

• sugars & phosphates

• RNA

Tags

NGSS.HS-LS1-1

Which of the following best describes a DNA molecule?

• double helix

• made of amino acids

• contains ribose

• contains uracil

Tags

NGSS.HS-LS1-1

Nitrogen bases are joined by what type of bond?

• polar bonds

• covalent bonds

• hydrogen bonds

• ionic bonds

What are three components of a nucleotide?

• sugar, hydrogen, nitrogen base

• sugar, phosphate, nitrogen base

• sugar, oxygen, nitrogen base

• sugar, phosphate, protein

Cytosine always pairs with

• Adenine

• thymine

• Guanine

• Cystosine

Thymine always pairs with

• Adenine

• thymine

• Guanine

• Cystosine

If part of a DNA strand is: ATGCCAT, what is the matching side?

Answer explanation

Remember: A --> T, C--> G

"Apples in Trees, Cars in Garages"

What is the significance of the sequence (order) of the nitrogen bases in DNA?

• The order of the bases determines the number of chromosomes an organism will have.

• The order of the bases determines the biological sex of an organism

• The order of the bases determines the traits the organism will have.

• The order of the bases determines if the organism is abiotic or biotic.

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

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

• You have DNA and your sibling does not.

• Your sibling has a weave.

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

• Your sibling has a genetic mutation.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2