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Effectus [21]
3 years ago
12

Describe the effector cells involved in humoral immunity

Biology
1 answer:
GalinKa [24]3 years ago
6 0

Answer:

B cell

Explanation:

The B cell works by producing antibodies that work against the antigen causing disease in the body. B cell is activated by a T-helper cell, which is, on the other hand, activated by antigen-presenting- cell of the innate immune system. The antibodies neutralize the antigens and allow for the phagocytic cell, such as macrophages, to ingest and destroy the cell. The antibodies also mark the antigens as a target for T-cytotoxic cells.

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Can a person live without salivary glands
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2 years ago
Explain how the data from the river samples showed that there was a problem with the water treatment plant.
Agata [3.3K]

Answer:

The water treatment plant does not work properly.

Explanation:

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5 0
3 years ago
6. A scientist measures the circumference of acorns in a population of oak trees
melisa1 [442]

Answer:

6. 2 cm

8. Greater than 2 cm and less than 2 cm

Explanation:

Complete Question

6. A scientist measures the circumference of acorns in a population of oak trees and discovers that the most common circumference is 2 cm. What would you expect the most common circumference(s) to be after 10 generations of stabilizing selection?

-2 cm

-Greater than 2 cm or less than 2 cm

-Greater than 2 cm and less than 2 cm

-Can't tell from the information given

8. Refer to question 6, but this time answer what you would expect after 10

generations of directional selection.

-2 cm

-Greater than 2 cm or less than 2 cm

-Greater than 2 cm and less than 2 cm

-Can't tell from the information given

Solution -

6. In an stabilizing selection, the average trait of a given population is favored over extreme values. Hence, it can be said that one specific trait is over presented in a given population. For example – uniform human birth weight, number of eggs a bird lay etc.  

Here in this case if most common circumference is 2 cm , then the tree population will try to have this trait as a stabilizing trait.  

Thus, option A is correct

8. In a  directional selection, the genetic variation decreases as per the environmental change. And hence the average trait will not be selected. Instead traits either higher or lower the average values will be preferred.  

Thus, option C is correct

3 0
3 years ago
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