A patient at a clinic complains of diarrhea that is occasionally bloody and has persisted for several days. A microscopic examination of a stool sample reveals the presence of very round cysts. These signs are consistent with infection by
A) Entamoeba histolytica.
B) Enterobius vermicularis.
C) Balantidium coli.
D) Giardia intestinalis.
E) Trypanosoma cruzi.
A
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Humans have __________ different types of autosomes.
A. 46 B. 44 C. 23 D. 22 E. 11
The exchange of gases with the respiratory
medium by animals occurs through the process of:
1.Active transport 2.Diffusion 3.Osmosis 4.Countercurrent exchangeRegarding atoms, identify which statement below is correct.
a. An element may be composed of several types of atoms. b. The nucleus of an atom contains protons and electrons. c. The number and arrangement of electrons in an atom governs its chemical activity. d. The positive charges of an element are carried by the electrons. e. The neutral charges of an element are carried by the protons.
In humans, what is brown adipose tissue used for?
a. for controlling blood pressure b. for digesting fats c. for nonshivering thermogenesis d. for cooling the body when it is exposed