Multiple sclerosis (MS) is an autoimmune disorder in which white blood cells destroy the myelin sheaths of ________
a. astrocytes
b. ependymal cells
c. oligodendrocytes
d. microglia
c
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You decide to study two species of birds, both of which form monogamous pairs (one male and one female). In species 1, you find that the eggs in a pair's nest are in fact almost always the offspring of that pair
In species 2, you are surprised to find that many of the eggs in a nest were actually fathered by males of neighboring pairs. Apparently, mating outside of monogamous pairings is widespread in species 2. Given this information, what would be the logical prediction to make before comparing testes size of males of the two species? A) Testes of species 1 are larger than testes of species 2. B) Testes of species 2 are larger than testes of species 1. C) There is no relationship between this observation and the size of testes.
In order to have a positive charge, an atom must have ________
A) more protons than electrons B) more electrons than protons C) more neutrons than protons D) more protons than neutrons
What is the main reason that the field of conservation biology has developed?
A. the consolidation of multiple fields of science into one in an attempt to be more efficient B. as a means of monitoring the stability of ecosystems C. humans looking for new methods of obtaining resources from the natural environment D. the current rates of extinction on Earth due to human-related factors
Microbes that naturally live within mammalian hosts are
a. psychrotolerant. b. mesophiles. c. thermophiles. d. xerophiles.