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