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Anna35 [415]
2 years ago
7

What did frederick griffith want to learn about bacteria?

Biology
1 answer:
NeX [460]2 years ago
8 0

Griffith wanted to develop a vaccine against pneumonia but during his experiments he identified the genetic material.

In his experiments, he used two strands of Streptococcus pneumoniae bacteria:

R strain- colonies with rough appearance; nonvirulent

S strain - rounded and smooth colonies; virulent (those bacteria had protein coat that protected them from mice immune system, so when they were injected in mice, mice developed pneumonia and died).

Then in the next steps of his experiment:

• Griffith injected mice with heat-killed S bacteria which did not cause disease;

•  R bacteria were combined with heat-killed S bacteria and injected into a mouse. Mice developed pnenumonia and die, but also Griffith found that the mice contained living S bacteria.

He concluded that the R-strain bacteria must have taken up something from the heat-killed S bacteria, which allowed them to "transform" and become virulent. Today, we now it is genetic material.

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Why is knowledge and skills important in animal care and breeding? Explain in 3 to 5 sentences.
erik [133]

Answer:

to be thorough and pay attention to detail.

the ability to use your initiative.

to be flexible and open to change.

patience and the ability to remain calm in stressful situations.

the ability to work well with others.

the ability to accept criticism and work well under pressure.

To be successful as an animal breeder, you should have knowledge of the animal breeding process

a passion for animal breeding,

and knowledge of the potential risks of animal breeding.

Ultimately, a top-notch animal breeder should be an effective communicator, have good organizational skills, and be physically fit.

3 0
2 years ago
An organic disorder whose symptoms tend to develop gradually and worsen over time is
Ne4ueva [31]

Answer:

D.

Explanation:

"However, a biopsychosocial approach to treatment is required to address all symptoms, particularly as organic disorders often have affective and relational consequences as well. Psychotherapy and cognitive rehabilitation strategies have been shown to be effective with a variety of acute and chronic organic disorders. Although therapeutic interventions with chronic degenerative conditions, such as Alzheimer’s dementia, cannot produce permanent change, they can optimize the person’s functioning and increase quality of life."-https://link.springer.com/referenceworkentry/10.1007%2F978-0-387-09757-2_36

I hope this helps.

7 0
2 years ago
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vesna_86 [32]
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Which of the following earth spheres is affected by the weather
AlekseyPX
The sun is the answer
4 0
3 years ago
Which reason most likely explains why some species survive mass extinctions on earth? a a broad range of species existed b domin
skad [1K]
I believe the answer is <span> A broad range of species existed</span>
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