Bio

The repeating units in both DNA and RNA are called

• hydrogen bonds

• nucleic acids

• nucleotides

• amino acids

The sugar that is in the backbone of DNA is called

• fructose

• ribose

• glucose

• deoxyribose

Nucleotide bases pair in DNA through

• hydrogen bonds between complementary bases

• polar covalent bonds between complementary bases

• sugar bonds between complementary bases

• none of the choices

What nucleotide base does RNA contain that DNA does not?

• adenine (A)

• cytosine (C)

• uracil (U)

• thymine (T)

If you have 40 adenine in a DNA molecule, how many thymine can you expect?

• 10

• 20

• 40

• 80

A piece of DNA was analysed and 15% of its nucleotides were adenine. What percentage would be uracil?

• 0%

• 15%

• 35%

• 70%

What are the components of a nucleotide?

• pentose sugar and phosphate group

• nitrogenous base, phospahte group, pentose sugar

• nitrogenous base and DNA

• nitrogenous base and pentose sugar

Which ones are purines?

• Adenine and Guanine

• Adenine and Thymine

• Cytosine and Guanine

• Cytosine and Thymine