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borishaifa [10]
4 years ago
7

Sharks feed on a wide variety of prey and have low mortality rates. It is important that an

Biology
1 answer:
nydimaria [60]4 years ago
3 0

Answer:

B. Many members of a key species, and the ecosystem will no longer be stable.

Explanation:

An ecosystem that contains a high degree of biodiversity will have numerous organisms of different species. According to the question, sharks are stated to feed on a wide variety of prey. This means that sharks can feed on any other species of organisms at lower trophic levels.

In a situation whereby an ecosystem contains a low degree of biodiversity i.e. low variety of species, the sharks will have to consume a large numbers of a key species, which will cause the ecosystem to lose stability.

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What is the mechanism(s) that bordetella pertussis uses to invade epithelial cells in the lungs?
MaRussiya [10]

The mechanism of action of  Bordetella pertussis is to stop the cilia of epithelial cells from beating.

<em>Bordetella pertussis</em> is a pathogenic, gram-negative bacteria. It is the causative agent of highly communicable respiratory disease known as pertussis or whooping cough.

The mechanism of action of  Bordetella pertussis:

  • This bacterium colonizes the ciliated epithelial cells of the respiratory airways of the host.
  • A surface protein on the bacteria called filamentous haemagglutinin adhesin binds to sulfatides on the cilia of epithelial cells. When the bacterium is anchored, it releases tracheal cytotoxin, which prevents the cilia from beating.
  • As a result, the cilia in an organism's lungs are unable to sweep out foreign material, and the body reacts by causing the host to cough. When people cough, bacteria are released into the air, where they might spread to other hosts.
  • Another toxin called the pertussis toxin, often known as PTx, prevents adenylate cyclase from using ATP to convert to cyclic AMP. This results in over-conversion of  ATP to cyclic AMP, which may interfere with cellular signaling systems. As a result, phagocytes are unable to respond to an infection effectively.

Know more about <em>Bordetella pertussis</em> here:

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6 0
2 years ago
Which of the following help to break down fats?
Lina20 [59]

Answer:

c. Bile and lipase

Explanation: is correct

7 0
3 years ago
Depending on the organism, the number of what in a cell may change?
enyata [817]
I believe it's the amount of mitochondria
5 0
4 years ago
Read 2 more answers
In diffusion, movement of particles across a membrane is driven by differences in
mote1985 [20]
C.  concentration;  moves from areas of high concentration to areas of low\

3 0
3 years ago
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Which of the following is the best definition of an opinion? Information that cannot be proven true or false. C. Something that
Solnce55 [7]
An argument.
An opinion is never correct nor incorrect they are all valid in their own right. So that eliminates b. It’s true that it can’t be proven to true or false however, some opinions have no evidence so they have no warrant to be proven or disproven. An argument however, is how you argue for what you believe in, you provide examples, to prove you’re right. To prove your opinion so I believe that D is the best option here.
5 0
3 years ago
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