Photosynthesis in plants, algae, and cyanobacteria produces
a) oxygen.
b) carbon dioxide.
c) sulfur granules.
d) hydrogen sulfide.
Ans: a) oxygen.
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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 atmospheric and water pressure does not affect the amount of oxygen that can be extracted from unpressurized breathing gas. C. The concentration of oxygen is lower in breathing gas than in normal air. D. The atmospheric and water pressure decreases the amount of oxygen that can be extracted from unpressurized breathing gas.
Rod-shaped bacteria are called:a
streptococci. b. bacilli. c. diplococci. d. vibrio. e. spirochete
Why might crop plants be genetically modified?
A) to decrease pesticide resistance in the plants B) to make the plants more resistant to freezing C) to reduce the amount of fat in the plants D) to increase the incidence of galls in the plants
Mutations can be good, bad or result in no change depending on:
a) The type of change. b) Where the change in DNA occurs. c) If the change is detected and fixed before replication. d) How it affects the organism and its survival. e) all of the above