____ is a breakdown in the walls of the alveoli which causes a reduction in gas exchange.

a) Bronchitis
b) Asthma
c) Emphysema
d) tuberculosis


Ans: c) Emphysema

Biology & Microbiology

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Which of the following defines the benthic realm?

a. The area of the ocean that is considered open water. b. The area of the ocean into which no light can penetrate. c. The area that extends along the ocean bottom along the shoreline to the deepest parts of the ocean floor. d. The area of the ocean between high and low tide that is the oceanic region closest to land.

Biology & Microbiology

If both homologous chromosomes of each pair exist in the same nucleus, that nucleus is

a. diploid. b. unable to undergo meiosis. c. haploid. d. none of the above.

Biology & Microbiology

Which of the following is a defining characteristic that all protocells had in common?

A) the ability to synthesize enzymes B) a surrounding membrane or membrane-like structure C) RNA genes D) the ability to replicate RNA

Biology & Microbiology

How does an action potential enter a skeletal muscle cell?

A) As a result of the interaction between actin and myosin B) Through a T tubule C) By diffusion D) In response to the release of calcium ions

Biology & Microbiology