DNA the Molecule
  • 1. DNA is made up of many
A) Phosphate groups
B) Bases
C) Sugar Molecules
D) Nucleotides
  • 2. Nucleotides have three main parts
A) G, T and C Bases
B) Acids, Bases and inorganic salts
C) Phosphate groups, deoxyribose sugars and nitrogen rich bases
D) Genes and Chromosomes X and Chromosomes Y
  • 3. The general shape of DNA is a
A) Circular
B) Triangular
C) Single Helix
D) Double Helix
E) Rectangular
  • 4. In the DNA structure (twisted rope ladder) the uprights of the ladder are alternating
A) phosphate and base molecules
B) phosphate and sugar molecules
C) sugar and base molecules
D) base molecules
  • 5. In the DNA structure (twisted rope ladder) the runs of the ladder are made up of
A) nitrogen-rich base pairs
B) phosphate and base molecules
C) sugar molecule pairs
D) phosphate and sugar molecules
  • 6. How many bases are there (in DNA)?
A) 6
B) 4
C) 0
D) 8
E) 2
  • 7. Nitrogen-rich bases pair up (complementary base pairing) in one way. A goes with
A) A
B) G
C) C
D) T
  • 8. Nitrogen-rich bases pair up (complementary base pairing) in one way. C goes with
A) C
B) T
C) G
D) A
  • 9. How many different rungs could be on the ladder of a DNA strand?
A) 0
B) 4
C) 8
D) 2
  • 10. Chromosomes are found in
A) the nucleus of the cell
B) the DNA strand
C) the red blood cell
D) the gene
  • 11. Human Cells have how many chromosomes
A) 50 (25) pairs
B) 100 (50 pairs)
C) 46 (23 pairs)
D) 20 (10 pairs)
  • 12. Sperm and Egg cells have how many chromosomes
A) 23 (half that of a normal human cell)
B) 0 (there is no nucleus)
C) 46 (same as a human cell)
D) 92 (double a human cell)
  • 13. Red blood cells have how many chromosomes
A) 92 (double a human cell)
B) 0 (there is no nucleus)
C) 46 (same as a human cell)
D) 23 (half that of a normal human cell)
  • 14. True or False: All animal cells have the same number of chromosomes as human cells (23 pairs)
A) False
B) True
  • 15. What is a gene?
A) Half a chromosome
B) Another name for chromosomes
C) A section of DNA that contains the genetic code
D) Another name for DNA
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