Fred griffith studied two strains of streptococcus pneumonia, one that causes a lethal infection when injected into mice, and a second that is harmless. he observed that pathogenic bacteria that have been killed by heating can no longer cause an infection. but when these heat-killed bacteria are mixed with live, harmless bacteria, this mixture is capable of infecting and killing a mouse. what did griffith conclude from this experiment?

The correct answer will be- there is some transforming principle which transformed the harmless bacteria to harmful bacteria.

Explanation:

Griffith performed the experiment on infection caused by the Streptococcus pneumonia in mice. He selected two strains of bacteria: avirulent strain called R strain and a virulent strain called S strain.  

During the experiment, when he heat-killed the S bacteria, added it to the R strain bacterial plates and then injected the bacteria into mice, he found that the bacteria killed the mice. He was astonished to see the result as the harmless bacteria killed the mice.

He concluded that adding the S bacteria produced some molecule which could have transformed the harmless bacteria to harmful bacteria. He called the transforming molecule as transforming principle.

Griffith performed the experiment on two strains of Streptococcus pneumonia in which one strain is avirulent called R strain and another virulent strain called S strain.

When Griffith killed the S bacteria (virulent) by heat and added it in the R strain Petri dishes and then injected the bacteria to mice, the mice killed. This amazed him as to how the avirulent bacteria killed the mice ?

He concluded that there was some principle which transformed the avirulent bacteria to virulent bacteria and thus called the principle as transforming principle.

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.