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Greeley [361]
2 years ago
9

Griffith, in his 1928 experiments, demonstrated that bacterial strains could be genetically transformed. The evidence that DNA w

as the "transforming principle" responsible for this phenomenon came later. What was the key experiment that Avery, MacCleod, and McCarty performed to prove that DNA was responsible for the genetic change from rough cells into smooth cells?
Biology
1 answer:
Nadusha1986 [10]2 years ago
6 0

Griffith's experiment worked with two types of pneumococcal bacteria (a rough type and a smooth type) and identified that a "transforming principle"  could transform them from one type to another.

At first, bacteriologists suspected the transforming factor was a protein. The "transforming principle" could be precipitated with alcohol, which showed that it was not a carbohydrate. But Avery and McCarty observed that proteases (enzymes that degrade proteins) did not destroy the transforming principle. Neither did lipases (enzymes that digest lipids). Later they found that the transforming substance was made of nucleic acids but ribonuclease (which digests RNA) did not inactivate the substance. By this method, they were able to obtain small amounts of highly purified transforming principle, which they could then analyze through other tests to determine its identity, which corresponded to DNA.

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(Will give brainliest if correct and no links) Based on the image in figure 2, would the creation of one type of kidney cell be
RSB [31]

Answer:

Yes.

Explanation:

The creation of one type of kidney cell will be sufficient in forming a functioning kidney because one type of cells allow the kidney to perform its one function i.e. filtering of blood. Epithelial stem cells are the cells that is responsible for the function of a kidney. The kidneys have only epithelial stem cells which performs only one function which removing water material, excess salts and water from the body. so we can say that one type of kidney cell is sufficient for the functioning of kidney.

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3 years ago
How do conditions change as the depth of the ocean water increases
sergeinik [125]

B) Temperature decrease and pressure increases

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What cycles through an ecosystem, but energy doesn’t. Explain why this is true
Alexxx [7]

Answer:

Energy does not cycle the way nutrients and atoms do. Energy enters the ecosystem from the Sun and exits after the organisms have taken as much as they need. Organisms release energy back into the biosphere as heat.

5 0
2 years ago
Drag the following examples to the correct type of species interactions that they exhibit.
gogolik [260]

Answer:

I believe the options are:

  1. Birds feed in berries produced by a tree. The birds receive a food source and the tree is able to disperse its seeds.
  2. An egret follows cattle in a field eating insects that are stirred  up. The egret receives a food source and the cattle are  unaffected.
  3. Abundance of host decreases.
  4. Abundance of both species increases.
  5. Ticks feed on the blood of a deer. The tick receives  vital nutrients and the deer is left weakened.
  6. Abundance of parasite increases.
  7. Abundance of one species increases, and the other is  not affected.

Species Interactions:

The correct species interactions are:

Parasitism:

3. Abundance of host decreases.

5. Ticks feed on the blood of a deer. The tick receives vital nutrients and the deer is left weakened.

6. Abundance of the parasite increases.

Commensalism:

2. An egret follows cattle in a field eating insects that are stirred  up. The egret receives a food source and the cattle are  unaffected.

7. Abundance of one species increases, and the other is  not affected.

Mutualism:

4. Abundance of both species increases.

1. Birds feed in berries produced by a tree. The birds receive a food source and the tree is able to disperse its seeds.

Explanation:

Species Interactions:

Species interactions are relationships between different members of a community. The main types are:

  1. Competition
  2. Parasitism
  3. Mutualism
  4. Commensalism
  5. Predation

Parasitism:

A relationship between two organisms in which one organism (parasite) lives in or on the host, derives its nutrients from the host and in turn, harms the host. In the above examples, the ticks feeding on deer blood derive nutrients from the deer but harm the deer as a result.

Commensalism:

A species interaction that involves one organism deriving benefits from another but the other neither loses nor gains any benefits i.e. the other organism is unaffected. In the above examples, the egret uses the cattle to find food but in turn the cattle are unaffected.

Mutualism:

In mutualism, both the organisms receive benefits from the species interaction. In the above examples, the birds benefit from the tree by retrieving nutrients and in turn the tree benefits in the dispersal of its seeds.

7 0
3 years ago
Scientific knowledge is based on evidence. Where do scientists acquire evidence?
Ber [7]

Answer:

Explanation:

Scientists collect their evidence through experimentation and/or observation.

6 0
3 years ago
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