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