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ki77a [65]
2 years ago
10

What best describes the role of cell-to-cell communication during a response to an invasion of antigens?

Biology
1 answer:
Svetllana [295]2 years ago
8 0

Answer:

Chemicals that are secreted from antigen-presenting cells then activate helper T cells.

Explanation:

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Describe how the role of phloem would would be affected if the leaves start to die off
Naya [18.7K]
The conductive tissues of the angiosperms are the xylem which drives the raw sap and the phloem which conducts the elaborate sap.The phloem, or liber, drives the elaborate sap, solution of organic substances rich in carbohydrates, from the leaves to the other organs.

The elaborate sap (which contains organic substances produces by photosynthesis) is produced in the leaves, where the majority of the chlorophyll subsist, so if the leave die off, the production of organic substances and the elaborate sap are reduced, so its transport by the phloem will be reduced, and this is how the phloem will be affected by the dying of the leaves.
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3 years ago
Where does the urea in the urine come from?
Vesnalui [34]

Answer:

Urea is produced when foods containing protein, such as meat, poultry, and certain vegetables, are broken down in the body. Urea is carried in the bloodstream to the kidneys, where it is removed along with water and other wastes in the form of urine.

Explanation:

8 0
2 years ago
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Serratia marcescens cells produce a red pigment at room temperature. The red color of the colonies is an example of which of the
Oliga [24]

Answer:

The red color of the colonies is an example of <u>a phenotype .</u>

Explanation:

Serratia marcescens -

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S. Mercescens are most commonly found in the environment , growing the bathroom and dirt .

It is gram-negative, produces a reddish - orange tripyrrole pigment called the prodigiosin , is an example of phenotype .

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3 years ago
Difference between colloids and crystalloids
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Crystalloids are aquous solution of mineral salts or other water soluble molecules 
colloids contains larger insoluble molecules such as blood and gelatin.



     hope it helps u....
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3 years ago
Giving brainliest!!!!!!!
Alex

Answer:

Explanation:

Hope this helps

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