When a cell membrane engulfs fluid droplets it is called:
A. receptor-mediated endocytosis
B. phagocytosis
C. osmosis
D. pinocytosis
E. diffusion
Answer: D
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Which of the following defines ecological resistance?
a. the ability of an ecosystem to remain at equilibrium despite disturbances b. the ability of a species or group of species to synthesize food molecules c. the speed at which an ecosystem recovers equilibrium after being disturbed d. the actions required for the species in a system to remain the same
Which is formed from the carbon shells of marine organisms?
a. limestone b. phosphates c. glaciers d. rhyolite e. gneiss
Stem cells can be found in ____
a. nerve tissue b. all adult tissue c. muscle d. epidermis e. umbilical cord blood
In a 3-D double helix model of DNA, the center consists of ____.
A. deoxyribose sugars B. nitrate groups C. nucleotide base pairs D. phosphate groups E. sugar–phosphate backbones