The theory that states chloroplasts and mitochondria arose from prokaryotes that lived within other cells is the ________ theory.

Fill in the blank(s) with the appropriate word(s).


Ans: Endosymbiotic

Biology & Microbiology

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Pasteurization of milk is an example of a disease control measure aimed at

A) preventing host-to-host transmission. B) controlling the disease vector. C) preventing common source diseases. D) eliminating the disease reservoir.

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The common characteristic of Alveolata is 

A. a single, unique mitochondria. B. a layer of flattened vesicles beneath the plasma membrane. C. silica covering. D. funnel-shaped, contractile collar. E. presence of a plasmodium.

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Which region of the brain is responsible for

controlling reflexes such as swallowing, coughing, and sneezing?

a. midbrain b. pons c. thalamus d. medulla oblongata e. cerebrum

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A group of organisms of one species that interbreed and occupy the same geographical location is a

A. population. B. flock. C. herd. D. community. E. peer group.

Biology & Microbiology