The toxin implicated in C. perfringens toxicity is
A. tetanospasmin.
B. exoenzyme S.
C. alpha-toxin.
D. endoenzyme T.
C.
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Mitochondrial gene defects most often affect the ____________________ and the ____________________
Fill in the blank(s) with correct word
In SCUBA diving, breathing gas, a mixture of oxygen and other gases, is carried in a breathing tank on the diver's back. This gas must be pressurized so the diver can breath underwater; it is not sufficient to simply bring unpressurized breathing gas or normal air underwater. Based on the Fick diffusion equation, what can you conclude about the concentration of oxygen available to the diver underwater?
A. The atmospheric and water pressure increases the amount of oxygen that can be extracted from unpressurized breathing gas. B. The concentration of oxygen is lower in breathing gas than in normal air. C. The atmospheric and water pressure decreases the amount of oxygen that can be extracted from unpressurized breathing gas. D. The atmospheric and water pressure does not affect the amount of oxygen that can be extracted from unpressurized breathing gas.
Scales and paired fins first evolved in __________fishes.
Fill in the blank(s) with the appropriate word(s).
Which component of the lower respiratory tract is incorrectly matched with a function or description?
A) alveoli: site of gas exchange B) lungs: contain the alveolar sacs C) bronchi: direct air to the lungs D) bronchioles: have ciliated mucous membranes E) larynx: contains the mucociliary escalator