1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Gre4nikov [31]
3 years ago
15

Who discovered that dna was the genetic material or transforming factor that could convert nonvirulent r-type streptococcus pneu

moniae bacterium to the virulent s-type?

Biology
1 answer:
KatRina [158]3 years ago
7 0
Discovery
               In 1928 it was discovered by Frederick Griffith in an experiment generally known as transformation.

Experiment
                 
 In his experiment he considered two strains of <em>streptococus pneumonia,</em> one was R-type which was non-virulent and cause no disease in mice, other was virulent and S-type which cause disease and at last death of mice.
This experiment was comprised of four steps which are as follow:

 Step 1:
           First he injected living strain of S into mice, after sometime mouce died.

Step 2:
          He injected living strain of R into mice, the mice alive as he did not got any disease.

Step 3:
         He injected heat killed strain of S into mice and mice remain alive.

Step 4:
           He mixed living R strain with heat killed S strain and then inject into mice. As a result the mice died.

Conclusion:
                  It was found that genetic material from heat killed S stain were transferred to living R (non-virulent) strain, as a result R become virulent and cause the death of mice.

You might be interested in
Why do scientists need to study seismic waves to analyze the interior of the earth and the layers of the earth?
DaniilM [7]

Answer:

Answer 1:

Seismic waves, the waves of energy that travel through the Earth as a result of an earthquake can tell us a lot about the internal structure of the Earth because these waves travel at different speeds in different materials. There are two types of waves that travel through the Earth: p-waves and s-waves.

P- waves are faster and they can travel through both solids and liquids. S-waves are slower and cannot travel through liquids. For both kinds of waves, the speed at which the wave travels also depends on the properties of the material through which it is traveling.

Scientists are able to learn about Earth’s internal structure by measuring the arrival of seismic waves at stations around the world. For example, we know that Earth’s outer core is liquid because s-waves are not able to pass through it; when an earthquake occurs there is a “shadow zone” on the opposite side of the earth where no s-waves arrive. Similarly, we know that the earth has a solid inner core because some p-waves are reflected off the boundary between the inner core and the outer core. By measuring the time it takes for seismic waves to travel along many different paths through the earth, we can figure out the velocity structure of the earth. Abrupt changes in velocity with depth correspond to boundaries between different layers of the Earth composed of different materials.

Explanation:

7 0
3 years ago
Which five probable ancestors of the modern bird (robin) are shown on the cladogram?
Nikitich [7]
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
5 0
3 years ago
If a moving object loses mass, how can it keep its momentum constant?
Hitman42 [59]

If a moving object loses mass, how can it keep its momentum constant?

A. by speeding up

8 0
3 years ago
How do organisms use oxygen
murzikaleks [220]

Organisms that use oxygen need it for cellular respiration, in which energy is released from glucose. Energy is needed by the organism for growth, mobility and reproduction.

4 0
3 years ago
Read 2 more answers
Second page I hope y’all have a great day
SOVA2 [1]

Answer:

6. We know because of bones and ancient fossils.

7. Yes, because we are currently making history right now as I write this.

8. About 5 or 4 billion years or 50 million years i think.

9. Charles Darwin was an English Biologist as well as a geologist.

10. Answer Depends on yourself, sorry

Explanation:

4 0
2 years ago
Other questions:
  • How would the temperature on Earth change without the greenhouse effect? A. The temperature at the equator would be warmer. B. T
    7·1 answer
  • Drag the following examples to the correct type of species interactions that they exhibit.
    8·1 answer
  • How do I know when eclipses occur....please help me
    13·2 answers
  • Unregulated cell division can result in _____.
    11·2 answers
  • 8. Which process is responsible for destroying shorelines along seawalls near urban areas?
    10·2 answers
  • After school I got a small cut on my arm. Although I washed it and put on a Band-Aid, the area was red, swollen, and I didn’t fe
    8·1 answer
  • 9. If an ecosystem is changed through a natural disaster, organisms will
    10·1 answer
  • Question 20 of 25
    9·2 answers
  • What are the stages of mitosis​
    9·2 answers
  • Cell membrane and movement across the Membrane.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!