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