Keith is observing a slide of an amoeba under a compound microscope. he places a stained fine particle of yeast near the amoeba. he observes that the amoeba is engulfing this particle by extending its pseudopodia. which process is the amoeba exhibiting?
a. pinocytosis
b. exocytosis
c. phagocytosis
d. receptor mediated endocytosis

c. phagocytosis

Explanation:

Phagocytosis is the process by which a living cell engulfs and ingests another cell or particles. In simple one celled organisms such as amoeba phagocytosis is a feeding mechanism. But in higher animals it is used as a defensive mechanism against the invasion of the pathogens such as bacteria and viruses. The amoeba is a simple one celled organism which consist of finger like projection called as pseudopodia which extends towards it's prey in water and it is brought inside the cell, the prey is ingested by a vacuole in the cell by the process of phagocytosis.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.