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Sav [38]
3 years ago
13

Explain How an immune system response starts after a macrophage attacks a pathogen || I need it fast please help

Biology
1 answer:
dybincka [34]3 years ago
5 0
After the macrophage fails the Helper T Cell stimulates the B cells if pathogen is extracellular and Cytotoxic T Cells if the pathogen is intracellular. Once the pathogen is killed the B Cells create Memory B Cells and the Killer T Cells create memory T Cells.
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Suppose an animal is heterozygous AaBb, and the traits are not linked. When meiosis occurs, what is the total number of possible
GrogVix [38]

Answer:

4 possible combinations of gametes

Explanation:

The animal is considered an heterozygotic dihybrid because it involves two genes that have different alleles for both genes. The dihybrid animal undergoes meiosis to produce gametes. According to Mendel in his laws of segregation and independent assortment, the alleles of the two genes separate into gametes independently of one another to produce 4 types of gametes.

Number of possible combinations of gametes formed by an heterozygote can be determined by using 2^n, where n is the number of characters. Number of characters or genes involved in this case is 2, Hence, 2^2 = 4 gametes.

The allelic combination in the four gametes are: AB, Ab, aB, ab.

7 0
3 years ago
Area of the brain linked to pleasure is located in the brain structure known as the:
iris [78.8K]
For the answer to the question above, it is t<span>he </span>cerebellum, it<span> plays an important role in balance, motor control, but is also involved in some cognitive functions such as attention, language, emotional functions (such as regulating fear and pleasure responses) and in the processing of procedural memories.
I hope my answer helped you.</span>
3 0
3 years ago
A student reported that a limp stalk of celery became crisp when placed in ice water In attempting to understand what happened t
FromTheMoon [43]
C. hypothesis. He is giving a possible answer to the question "why did the celery crisp when placed in water?"
4 0
3 years ago
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How does xylem is helpful for plants
tresset_1 [31]
Xylem is a very useful tissue in plants used for transportation of water from roots of a plant to its upper part for its proper growth
5 0
3 years ago
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A client has been diagnosed with otosclerosis. the nurse explains to the client that this is a common cause of hearing impairmen
expeople1 [14]

The right answer is spongy bone (cancellous bone).

In otosclerosis, the new bone blocks the movement of the stirrup, causing transmission hypoacusia. Otosclerosis can also cause perceptive deafness, especially when otosclerotic bone foci are close to scala media. Half of all cases are hereditary. The measles virus may play a role in triggering a genetic predisposition to otosclerosis.

4 0
3 years ago
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