People who smoke both marijuana and tobacco have ____ respiratory problems than tobacco-only smokers.
A. less
B. more
C. more serious
D. less serious
E. the same amount of
Answer: B
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If an organism has a single copy of each chromosome, then it is
A. aneuploidy. B. diploid. C. haploid. D. tetraploid. E. polyploidy.
____________________ junctions are channels that connect the cytoplasm of neighboring cells. Fill in the blank(s) with the appropriate word(s)
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.
Most ________ are located at specific areas where bacteria microbes tend to attack so that they can readily engulf and destroy the invading bacteria
A) red blood cells B) leukocytes C) macrophages D) interferons