Dna Structure

A photograph of a virus is shown.  The projections on the surface of the virus allow the virus to -

• move inside a host cell
• attach to a host cell
• control the host cell's DNA
• signal other viruses to infect the host cell

Characteristics such as a widow’s peak or attached earlobes are determined by the genetic code. Which components of DNA are referred to as the genetic code?

• Phosphate groups
• Nitrogenous bases
•  Deoxyribose sugars
• Hydrogen bonds

Four different nucleotides are used as building blocks of DNA. Which of the following can be used to distinguish one nucleotide from another?

• The nitrogenous base

• The shape of the deoxyribose sugar

• The length of the phosphate group

• The type of fatty acid

Which of these models of a DNA strand (below) shows bases that are complementary to the ones on the student’s DNA model (above)?

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What does DNA stand for?

• Deoxyribonucleic acid
• Denitrogenous acid
• Deribonucleic acid
• Diribonucleic acid

Which of the following best describes a DNA molecule?

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

DNA is a polymer made of:

• Nucleotides
• Ribosomes
• Purines
• Pyrimidines

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

In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of

• cytosine
• guanine
• thymine
• uracil

Which organelle is DNA usually found in?

• cell membrane
• vacuole
• ribosome
• nucleus