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pav-90 [236]
2 years ago
10

In Griffith experiments why did the mouse live when injected with heat killed smooth and rough bacteria?

Biology
1 answer:
hjlf2 years ago
6 0

Answer:

The rough bacteria do not have a polysaccharide capsule so mice lived when injected with this strain.  Smooth bacteria have a polysaccharide capsule that protects the bacteria from the immune system, making them virulent and therefore kill mice.  Heat killed smooth bacteria don't have the capsule and are not virulent.

Explanation:

Streptococcus pneumonia has two types of strains, the smooth strain and the rough strain.  Cells of the smooth strain have a protective polysaccharide capsule which protect the cell against the immune system, making it highly pathogenic.  Cells of the rough strain do not have a capsule to protect them against the immune system, the immune system can easily kill the rough strain.  When the cells of the smooth strain are injected in mice the mouse is killed, and when the cells of the rough strain are injected in mice the mice live.

In the next part of the experiment, the cells of the smooth strain were killed by heat, and when these cells are injected into the mice, the mice lived.  But when the cells of the heat killed smooth strain are mixed with the rough strain and then injected in mice, the mice died.  So the DNA from the heat killed smooth strain transformed the rough strain to the virulent strain.

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adh or vasopressin... group of answer choices all of these options are correct promotes the insertion of aquaporins (specificall
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Two of these options are correct (A & E)

So, the correct option is D.

<h3>About ADH/Vasopressin:</h3>
  • Other name for ADH is arginine vasopressin.
  • It is a hormone produced by the brain's hypothalamus and kept in the posterior pituitary gland.
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  • They also control how thirsty your body feels.
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<h3> Aquaporins and ADH:</h3>
  • Antidiuretic hormone levels above a certain threshold narrow (constrict) blood arteries, raising blood pressure.
  • The only way to fully recover from a lack of bodily fluid (dehydration) is by drinking more water.
  • The aquaporin 2 protein is made according to instructions from the AQP2 gene.
  • The water molecules are transported across cell membranes by this protein, which creates a channel.
  • Collecting ducts, a network of tiny tubes that reabsorb water from the kidneys into the bloodstream, are found in the kidneys where it is discovered.
  • In order to keep the body's water balance in check, the aquaporin 2 water channel is crucial.
  • A hormone known as vasopressin or antidiuretic hormone regulates the positioning of these channels (ADH).
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  • Aquaporin 2 water channels are ultimately inserted into the membrane of collecting duct cells by this hormone, which sets off chemical events.
  • Due to the re-absorption of water into the bloodstream made possible by these channels, the urine is more concentrated.
  • Less ADH is created when fluid intake is sufficient. Aquaporin 2 water channels are taken out of the collecting duct cells' membrane in the absence of signals from ADH.
  • During these times, the urine is more diluted and less water is reabsorbed into the bloodstream.

Disclaimer: The given question was incomplete on the portal. Here is the complete question.

Question: ADH or Vasopressin...

A. Promotes the insertion of aquaporins (specifically AQP2) into the apical membrane of the collecting duct cells

B. Promotes the insertion of aquaporins (specifically AQP3 and AQP4) into the basolateral membrane of the collecting duct cells

C. All of these options are correct

D. Two of these options are correct

E. When released, increases the osmolarity of the excreted urine

Learn more about "ADH" :

brainly.com/question/25921436

#SPJ4

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