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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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
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
Biology & Microbiology
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.
Biology & Microbiology
Hypo-osmotic body fluids
What will be an ideal response?
Biology & Microbiology