Which of the following can increase red blood cell concentration in a unit of blood?
A) training at low altitudes
B) reducing blood levels of EPO
C) blood doping
D) hydration
Answer: C
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Diffusion of water from a hypertonic solution to a hypotonic solution across a semi-permeable membrane ____
a. will occur until both solutions are isotonic b. will occur until both sides are hypotonic c. will occur until both sides are hypertonic d. will occur until the tonicities are reversed e. will not occur
Which of the following is NOT true of
polysaccharides? a. composed of many linked monosaccharides b. may be straight and unbranched or highly branched c. most likely made of glucose molecules if they are one of the natural polysaccharides d. may be insoluble because of their large size and structure e. are formed by cleavage reactions
Rheumatoid arthritis (RA)
What will be an ideal response?
Several species of sea urchins may inhabit the same tide pool and their reproductive periods overlap. Although they practice external fertilization, they seldom interbreed because eggs produce chemicals that are only attractive to sperm of their own species. This is an example of a ________ barrier that ________.
A. prezygotic; prevents gamete fusion B. prezygotic; causes temporal isolation C. prezygotic; causes geographic isolation D. postzygotic; prevents zygote fusion E. postzygotic; causes hybrid infertility