Question

One Gene-one enzyme relationship was established for the first time in?

• A. Escherichia Coli
• B. Neurospora crassa
• C. Diplococcus pneumoniae
• D. Salmonella typhimurium

Answer 1

The correct option is B

Neurospora crassa

The correct option is B:

Explanation for Correct option:

1. Neurospora crassa is used as a model organism because it is easy to culture and has a haploid life cycle, which allows for straightforward genetic analysis because recessive characteristics will manifest in the progeny.
2. Beadle and Tatum used a simple organism called Neurospora crassa, or common bread mold.
3. They were able to demonstrate a clear link between genes and metabolic enzymes using the Neurospora organism.

Explanation for Incorrect options:

Option A:

1. Escherichia coli, also known as E. coli, is a Gram-negative, anaerobic, coliform bacteria found in the lower intestine of warm-blooded species.

Option C:

1. Inhalation of respiratory droplets (e.g. coughing, sneezing) from an infected individual spreads Streptococcus pneumoniae from person to person and causes Pneumonia.

Option D:

1. Salmonella Typhimurium is a type of enteric bacteria that can infect both humans and animals.
2. Salmonella infection starts with the ingestion of infected food or water, which allows the bacteria to penetrate the intestinal epithelium and cause gastrointestinal illness.

Final answer: One Gene-one enzyme relationship was established for the first time in Neurospora crassa.