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3 years ago

Rats that received electric shocks were unlikely to develop ulcers if the

Biology

1 answer:

Black_prince [1.1K]3 years ago

3 0

Answer:

Rats could control the termination of the shocks.

Explanation:

From the experiment carried out by Dr. Weiss, he discovered that rats with high predictability of shock had far fewer ulcers that those who could not control the shocks. Dr. Weiss suggests that this knowledge can be applied to human beings in the fight against ulcers.

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The human immunodeficiency virus (hiv) that causes the disease known as aids selectively infects ________ cells.

Furkat [3]

The human immunodeficiency virus (HIV) that causes the disease known as aids selectively infects helper T cells (CD4+).

This retrovirus also infects macrophages and dendritic cells. When CD4+ T cell numbers decrease below a critical level (due to the killing of this cells with different mechanisms), cell-mediated immunity is lost. As a result, the body becomes progressively more susceptible to infections, leading to the development of AIDS.

HIV can be transmitted only via body fluids like blood, semen, pre-seminal fluid, rectal fluids, vaginal fluids, and breast milk, which means that people usually get or transmit HIV through sexual behaviours and use of the needle. For HIV infection, these fluids must come in direct contact with a mucous membrane or damaged tissue. Another way is to be directly injected into the bloodstream (from a needle for example).

7 0

3 years ago

Food Web please help

a_sh-v [17]

A. land plants, tiny water plants
a. slug, frog, newt
b. plants, slug-insect-water fleas, frog-fish-newt, perch-fox, heron
c. water fleas, diving beetles
d. heron, perch
e. one thing that could happen if all frogs suddenly died is that there would be an overpopulation of slugs, insects, and beetles. another thing that could happen would be that foxes would only rely on getting slugs for food so the slugs would soon go extinct and the plants would possibly over populate.

hope this helps!!

7 0

2 years ago

Read 2 more answers

A new species of living thing is discovered. The cell theory states that which of the following must be true about this new livi

statuscvo [17]

Answer:

The last one and the first one.

hope I could help you pls give this answer a hart thx

Explanation:

3 0

3 years ago

Which of the following takes place in the light-dependent reactions of

Fantom [35]

Answer:

b) Energy is Captured.

The sunlight is converted to chemical energy

go for it!!

5 0

2 years ago

Oompah’s with type O blood receive a tax break. ophine oompah has type a blood, but he wants a wife that will give him children

vova2212 [387]

Answer:

He should request type O on his dating survey.

Opine's blood type must be AO to have a higher probability of producing O offsprings.

Explanation:

O blood type is recessive so, when it is paired with another blood type like B or A, these would be dominant, giving B and A blood, respectively.

O blood type results are possible thanks to OO genotypes.

If the man's blood type is A, to have a higher chance of producing OO offsprings, his blood should be AO. The other possibility is that he has AA blood, which will result in a low probability of OO offsprings.

As regards the mother, her blood type should be OO.

We can see this more clearly in Punnet Square.

║ A ║O

O║AO║OO

There is a 50% of probability of having O offsprings with AO and OO.

║ A ║A

O║AO║AO

O║AO║AO

With AA and OO, the probability is 0%

║ A ║O

A║AA║AO

O║AO║OO

With both parents having AO, blood the probability of having a OO offspring is 25%.

In conclusion, the higher chances of producing a OO offspring is if the parents are AO and OO.

3 0

3 years ago