Which of the following protists are capable of forming cysts?

A) E. histolytica
B) A. proteus
C) T. gambiense
D) T. vaginalis


A) E. histolytica

Biology & Microbiology

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Several infections of the cardiovascular system can be identified by inspecting a stained blood smear in the microscope.  For the following infections, identify the microscope observation that does not fit the disease.

A. Chagas disease; protozoan visible among blood cells B. Malaria; ring trophozoites visible inside red blood cells C. Epstein-Barr virus; virus visible inside red blood cells D. Babesiosis; protozoan visible inside red blood cells

Biology & Microbiology

Contraction of the fibers labeled A in the accompanying figure results in:


a. elongation of the body.
b. elongation of the tentacles.
c. elongation of the gastrovascular cavity.
d. shortening of the body.
e. expansion of the pedal disk.

Biology & Microbiology

In many parts of the Amazon Basin, farmers have cut down the tropical rain-forest trees and planted crops. However, the farmers often abandon these croplands after a few years and move on. What are some possible reasons for this?

What will be an ideal response?

Biology & Microbiology

An oligotrophic ecosystem would be most likely to exist in a/an ________

a) Ocean b) High mountain lake c) Tropical pond d) Polluted river

Biology & Microbiology