16. Who conducted experiments on pea plants to establish the laws of heredity?
a) Gregor Mendel
b) Charles Darwin
c) Rosalind Franklin
d) James Watson
Answer: a) Gregor Mendel
17. Who developed the first successful polio vaccine using a weakened live virus?
a) Albert Sabin
b) Jonas Salk
c) Edward Jenner
d) Louis Pasteur
Answer: a) Albert Sabin
18. Who discovered the structure of the double helix in DNA?
a) James Watson
b) Francis Crick
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c) Rosalind Franklin
d) Maurice Wilkins
Answer: c) Rosalind Franklin
19. Who is known for discovering the cure for malaria?
a) Paul Ehrlich
b) Alexander Fleming
c) Ronald Ross
d) Gerhard Domagk
Answer: c) Ronald Ross
20. Who proposed the endosymbiotic theory of the origin of eukaryotic cells?
a) Lynn Margulis
b) Carl Woese
c) James Watson
d) Francis Crick
Answer: a) Lynn Margulis
