Encircle the letter of the correct word or phrase that best completes each sentence.

1. Single-celled organisms are exemplified by the _____

a. fly
b. ponge
c. sea star
d. Paramecium

2. The shells of foraminifera are used as a source of _____

a. oil
b. sand
c. pearl
d. chalk

3. The ____ is the protist that can be found in human teeth.

a. Amoeba proteus
b. Balantidium coli
c. Entamoeba gingivalu
d. Entamoeba hustolytica

4. The ____ is the protist that causes malaria and is transmitted by the bite of the female Anopheles mosquito.

a. Plasmodium vivar
b. Plasmodium ouale
c. Plasmodium malariae
d. Plasmodium falciparum

5. The Plasmodium cells that attack red blood cells and cause malaria are called _____

a. merozoites
b. protozoites
c. sporozoites
d. trophozoites

6. Bacteria can be destroyed at temperatures of _____
a. 10°C to 24°C
c. 37°C to 60°C
b 25°C to 40°C
d. 65 C to 70°C

7. Cholera is caused by _____

a. Diplococcus
b. Vibrio comma
c. Salmonella typhi
d. Bordetella pertussis

8. ______ is not caused by bacteria.

a. Mаlаria
c. Tuberculosis
b. Measles
d. Paralytic shellfish poisoning

9 Bacteria are useful because they _____

a. are sources of antibiotics
b. can decompose dead organisms
c. cause tumors in plants and animals
d. can manufacture food by chemosynthesis

10. _____ is not caused by viruses.

a. mumps
b. sore throat
c. chicken pox
d. whooping cough​