In the early 1900s what molecule was considered to transmit hereditary information from one generation to the next?

In the early 1900s what molecule was considered to transmit hereditary information from one generation to the next?

• A. Proteins
• B. DNA
• C. RNA
• D. Lipids

Answer: (A)

In the early 1900s, scientists reasoned that a highly versatile molecule must carry hereditary information. Proteins offered enormous chemical variety because there are 20 different amino acids and countless ways they can fold and interact, making them seem capable of encoding the wide range of traits organisms display. DNA, with its four bases, looked too uniform to account for that complexity, so the protein component of chromosomes was long thought to be the genetic material. This view fit what was known at the time about chromatin and inheritance, so proteins were considered the carriers of hereditary information. It wasn’t until later experiments demonstrated that DNA can store and transmit genetic information that the idea shifted away from proteins toward DNA, while lipids were seen as structural membrane components and RNA was not yet recognized as the primary hereditary material.

In the early 1900s, scientists reasoned that a highly versatile molecule must carry hereditary information. Proteins offered enormous chemical variety because there are 20 different amino acids and countless ways they can fold and interact, making them seem capable of encoding the wide range of traits organisms display. DNA, with its four bases, looked too uniform to account for that complexity, so the protein component of chromosomes was long thought to be the genetic material. This view fit what was known at the time about chromatin and inheritance, so proteins were considered the carriers of hereditary information. It wasn’t until later experiments demonstrated that DNA can store and transmit genetic information that the idea shifted away from proteins toward DNA, while lipids were seen as structural membrane components and RNA was not yet recognized as the primary hereditary material.