Mallika- practice

Which of the following best describes a DNA molecule?

• double helix
• contains ribose
• made of amino acids
• contains Uracil

Adenine bonds with ______________.

• Guanine
• Thymine
• Cytosine
• Adenine

Guanine bonds with ______________.

• Adenine
• Guanine
• Cytosine
• Thymine

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

Which 2 molecules forms the sides (backbone) of the DNA ladder?

• deoxyribose and adenine
• deoxyribose and a hydrogen bond
• sugar and the nucleus
• deoxyribose (sugar) and phosphate

What bonds the nitrogen bases in the center of the DNA strand?

• Covalent Bonds
• Ionic Bonds
• Hydrogen Bonds
• Metallic Bonds

Which shows the correct complementary base pairing for DNA?

• C-A, T-G
• A-G, C-T
• C-G, U-A
• T-A, G-C

Which sequence of DNA bases would pair with this partial strand
ATG TGA CAG

• ATG TGA CAG
• TAC ACT GTC
• GTA AGT GAC
• CAT TCA CTG

In a sample of DNA, 20 percent is Adenine. What are the percentages of the other bases?

• Thymine - 30 percent, Cytosine 25 percent, Guanine 25 percent
• Cytosine - 20 percent, Thymine - 30 percent, Guanine 25 percent
• Thymine - 20 percent, Cytosine 30 percent, Guanine 30 percent
• Thymine - 30 percent, Cytosine 30 percent, Guanine 20 percent

DNA codes for...

• cholesterol
• proteins
• fatty acids
• a sandwich