Which of the following white blood cells alerts the immune system when an antigen is present?

a. neutrophils
b. basophils
c. eosinophils
d. dendritic cells
e. B and T lymphocytes


D

Biology & Microbiology

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Which term refers to media that contain water, organic carbon sources, and salts, but no extra nutritional components?

a. nutritious media b. complete media c. minimal media d. agar media

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Brown-air cities are so-called because

A. automobile exhaust is gray. B. of persistent fog. C. of excessive acid rain. D. the air pollutants undergo chemical reactions in sunlight.

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What are chemical messengers that control growth differentiation and the metabolism of specific target cells called?

a) hormones b) neurons c) glands d) second messengers

Biology & Microbiology

Hypo-osmotic body fluids

What will be an ideal response?

Biology & Microbiology