The platelet-derived growth factor stimulates the growth of what type of cell?
a. stem cells
b. blood cells
c. endothelial cells
d. brain cells
Ans: c. endothelial cells
Biology & Microbiology
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Human milk contains _____
a. calcium only b. antibodies only c. calcium and protein, but not antibodies d. sugar and calcium, but not protein e. calcium, antibodies, sugar, and protein
Biology & Microbiology
The term that refers to the ability of the body to combat pathogens is _________.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
What is the possible advantage of being heterozygous for the sickle-cell gene?
What will be an ideal response?
Biology & Microbiology
As DDT accumulates in the tissues of carnivores at increasing trophic levels, the concentration increases; this is representative of ________
Fill in the blank(s) with correct word
Biology & Microbiology