The scientist who proposed the 'one gene-one enzyme' hypothesis was: MCQ with Answer and Explanation

The scientist who proposed the 'one gene-one enzyme' hypothesis was:
A. Beadle and Tatum
B. Watson and Crick
C. Hershey and Chase
D. Meselson and Stahl
Answer: Option A
Solution (By JKSSB Mock Tests)
George Beadle and Edward Tatum, working with Neurospora crassa, proposed that each gene controls the synthesis of a specific enzyme (later refined to one gene-one polypeptide). Watson and Crick discovered DNA structure, Hershey-Chase confirmed DNA as genetic material, Meselson-Stahl demonstrated semi-conservative replication.

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Practice More Biology Questions

Question #1
The disease caused by the tapeworm Taenia solium is:
A. Ascariasis
B. Taeniasis
C. Filariasis
D. Trichinosis

Correct Answer: Option B


Explanation:
Taeniasis is intestinal infection with adult Taenia solium (pork tapeworm). Cysticercosis is when larvae infect tissues. Ascariasis is roundworm, filariasis nematode, trichinosis Trichinella.

This question belongs to: Science Biology
Question #2
Consider statements about ribosomes: 1. They are non-membranous organelles. 2. Prokaryotic ribosomes are 80S. 3. They are the site of protein synthesis. Which are correct?
A. 2 and 3 only
B. 1 and 2 only
C. 1, 2 and 3
D. 1 and 3 only

Correct Answer: Option D


Explanation:
Ribosomes are dense, spherical, non-membranous structures composed of RNA and proteins. They are the cellular factories for protein synthesis. Prokaryotic ribosomes are 70S (50S + 30S subunits), while eukaryotic cytoplasmic ribosomes are 80S (60S + 40S subunits). Therefore, statements 1 and 3 are correct, but statement 2 is false.

This question belongs to: Science Biology
Question #3
The sequence of progressive, predictable changes in the species composition of a community over time is called:
A. Eutrophication
B. Stratification
C. Ecological succession
D. Biological magnification

Correct Answer: Option C


Explanation:
Ecological succession is the gradual and predictable process of change in the species composition of an ecological community over time. It occurs after a disturbance (secondary succession) or on a newly formed, lifeless substrate (primary succession). The final, stable community that is in near equilibrium with the environment is called the climax community. The entire sequence of communities is called a sere.

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