OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
1963
|
|
|
1958
|
|
|
1953
|
|
|
1968
|
Detailed explanation-1: -In 1950, biochemist Erwin Chargaff found that the arrangement of nitrogen bases in DNA varied widely, but the amount of certain bases always occurred in a one-to-one ratio. These discoveries were an important foundation for the later description of DNA.
Detailed explanation-2: -In “A Structure of Deoxyribose Nucleic Acid, ‘’ Watson and Crick described DNA as a double helix that contained two long, helical strands wound together. In their model, each DNA strand contained individual units called bases, and the bases along one DNA strand matched the bases along the other DNA strand.
Detailed explanation-3: -The molecule now known as DNA was first identified in the 1860s by a Swiss chemist called Johann Friedrich Miescher.