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
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
18. Who discovered the structure of the double helix in DNA?
a) James Watson
b) Francis Crick
c) Rosalind Franklin
d) Maurice Wilkins
19. Who is known for discovering the cure for malaria?
a) Paul Ehrlich
b) Alexander Fleming
c) Ronald Ross
d) Gerhard Domagk
20. Who proposed the endosymbiotic theory of the origin of eukaryotic cells?
a) Lynn Margulis
b) Carl Woese
c) James Watson
d) Francis Crick