Exploring DNA Structure and Function

What is the shape of the DNA molecule?

• Double helix

• Single strand

• Triple helix

• Circular loop

Which of the following are the four nitrogenous bases found in DNA?

• Adenine, Thymine, Guanine, Cytosine

• Adenine, Uracil, Guanine, Cytosine

• Thymine, Uracil, Guanine, Cytosine

• Adenine, Thymine, Guanine, Uracil

What type of bond holds the two strands of DNA together?

• Ionic bonds

• Hydrogen bonds

• Covalent bonds

• Metallic bonds

Which sugar is found in the backbone of DNA?

• Glucose

• Ribose

• Deoxyribose

• Fructose

What are the repeating units that make up the DNA molecule?

• Amino acids

• Nucleotides

• Fatty acids

• Monosaccharides

Tags

NGSS.HS-LS1-1

If one strand of DNA has the sequence 5'-ATCG-3', what is the complementary sequence on the other strand?

• 5'-TAGC-3'

• 3'-TAGC-5'

• 5'-CGAT-3'

• 3'-CGAT-5'

Explain how the structure of DNA allows it to be copied accurately during cell division.

• The double helix unwinds and each strand serves as a template for a new strand, ensuring accurate copying.

• The DNA breaks into pieces and reforms randomly.

• The DNA is copied by matching amino acids.

• The DNA is copied by using lipids as templates.

Tags

NGSS.HS-LS1-4

A scientist finds a DNA sample with 30% adenine. Using your knowledge of base pairing, what percentage of guanine would you expect to find in this sample?

• 20%

• 30%

• 40%

• 70%

Why is the sequence of bases in DNA important?

• It determines the order of amino acids in proteins.

• It gives DNA its double helix shape.

• It allows DNA to dissolve in water.

• It makes DNA visible under a microscope.

Tags

NGSS.HS-LS1-1

A mutation changes a cytosine (C) to a thymine (T) in a DNA sequence. Predict one possible effect this could have on the organism.

• It could change the protein produced, possibly affecting the organism's traits.

• It will always make the organism stronger.

• It will have no effect because DNA is not important.

• It will turn DNA into RNA.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2