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Flura [38]
3 years ago
8

The answer for this

Biology
1 answer:
BigorU [14]3 years ago
6 0

Answer:

Not a scientific question bevause it asks about what people think instead of how nature works

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1. Key Concept List the
Ipatiy [6.2K]
<h2>DNA </h2>

Explanation:    

1) Experiment done by Griffith:

  • Griffith used two related strains of bacteria, known as R and S
  • R bacteria were nonvirulent, meaning that they did not cause sickness when injected into a mouse whereas mice injected with live S bacteria developed pneumonia and died
  • Griffith tried injecting mice with heat-killed S bacteria (that is, S bacteria that had been heated to high temperatures, causing the cells to die), the heat-killed S bacteria did not cause disease in mice
  • When harmless R bacteria were combined with harmless heat-killed S bacteria and injected into a mouse, not only did the mouse developed disease and died, but when Griffith took a blood sample from the dead mouse, he found that it contained living S bacteria
  • Griffith concluded that the R-strain bacteria must have taken up what he called a transforming principle from the heat-killed S bacteria, which allowed them to transform into smooth-coated bacteria and become virulent

2) Experiment done by Avery:

  • Avery, McCarty and MacLeod set out to identify Griffith's transforming principle
  • They began with large cultures of heat-killed S cells and, through a long series of biochemical steps progressively purified the transforming principle by washing away, separating out, or enzymatically destroying the other cellular components
  • These results all pointed to DNA as the likely transforming principle but Avery was cautious in interpreting his results
  • He realized that it was still possible that some contaminating substance present in small amounts, not DNA, was the actual transforming principle

3) Experiment done by Hershey and Chase:

  • Hershey and Chase studied bacteriophage, or viruses that attack bacteria
  • The phages they used were simple particles composed of protein and DNA, with the outer structures made of protein and the inner core consisting of DNA
  • Hershey and Chase concluded that DNA, not protein, was injected into host cells and made up the genetic material of the phage

8 0
3 years ago
A model for a​ company's revenue from selling a software package is ​R(p)equals=−2.52^2400​p, where p is the price in dollars of
dsp73

A model for a​ company's revenue from selling a software package is ​R(p)=-2.5p² + 400​p, where p is the price in dollars of the software. What price will maximize​ revenue? Find the maximum revenue.

Answer: p = $80,  R = $16,000

Step-by-step explanation:

The maximum is the y-value of the Vertex.

Step 1: Use the Axis-Of-Symmetry (AOS) formula to find x:

x=\frac{-b}{2a}

R(p) = -2.5p² + 400

     a= -2.5  b=400

p=\frac{-(400)}{2(-2.5)}

         = \frac{-400}{-5}

        =80

∴ In order to maximize the value, the company will sell the software package for $80

Step 2: Find the maximum by plugging the p-value (above) into the given equation.

R(80) = -2.5(80)² + 400(80)

         = -16,000 + 32,000

         = 16,000

7 0
3 years ago
What might cause a cold spell in the northern United States?
ehidna [41]
I'm pretty sure it would be D... If that's wrong I'm sorry.
4 0
3 years ago
This sphere is the layer of Earth that contains a mixture of gases.
sesenic [268]
Atmosphere 
I hope this helps you have a great day!
8 0
2 years ago
Read 2 more answers
An ectothermic organism would have the advantage over an endothermic organism when ______.
Otrada [13]

Answer:

<h2>Food is scarce year-round</h2>

Explanation:

Ectotherm, called cold-blooded animals, whose regulation of body temperature depends on external sources, such as sunlight or any  other environmental source.

Example of  Ectotherm are:  fishes, amphibians, reptiles, and invertebrates.

Endotherm -called warm-blooded animals; those maintain a constant body temperature independent of the environment.

Example of endotherms ;  include the birds and mammals and some fish are also endothermic.

Costs and Benefits of Endothermy

By Increasing the rate of metabolism is especially energy intensive. As a result, endothermic animals typically need more food than ectothermic animals.

5 0
3 years ago
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