1 - Which of the following statements are true?
a)Generally speaking, the ability of a substance to move across a membrane by passive diffusion is enhanced by decreasing size and by an increasing octanol/water coefficient.
b)Passive diffusion is subject to saturation effects.
c)Facilitated diffusion can move substances across a membrane against a concentration gradient.
d)The stratum corneum is rich in blood vessels.
e)Defatting agents change the structure of cellular membranes by removing lipids.
f)The epidermal layer of skin is easily penetrated by water.
2 - Aluminum in blood plasma was shown to undergo a first order elimination reaction with a half-life of 160 days. If the initial concentration was 6.5 µg/L, how long will it take for the concentration to drop to 2.5 µg/L?
3 - Convert 35 ppm of methane (CH4) at 22 oC and 753 torr to mg/m3
1 - Which of the following statements are true?
a)Generally speaking, the ability of a substance to move across a membrane by passive diffusion is enhanced by decreasing size and by an increasing octanol/water coefficient.
b)Passive diffusion is subject to saturation effects.
c)Facilitated diffusion can move substances across a membrane against a concentration gradient.
d)The stratum corneum is rich in blood vessels.
e)Defatting agents change the structure of cellular membranes by removing lipids.
f)The epidermal layer of skin is easily penetrated by water.
2 - Aluminum in blood plasma was shown to undergo a first order elimination reaction with a half-life of 160 days. If the initial concentration was 6.5 µg/L, how long will it take for the concentration to drop to 2.5 µg/L?
3 - Convert 35 ppm of methane (CH4) at 22 oC and 753 torr to mg/m3
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