Which body form of the cnidarians is sessile?
A) Jelly
B) Fish
C) Medusa
D) Polyp
D
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What type of cell activates a B cell?
a. neutrophil b. basophil c. T helper cell d. cytotoxic T cell
A couple has four children. What is the probability that they have four boys?
A) 1/2 B) 1/4 C) 1/8 D) 1/16 E) 1/32
Skin grafts between identical twins are more successful than grafts between more unrelated individuals. Why?
A. Identical twins share the same uterine environment. B. Twins are exactly matched in age. C. Identical twins have identical HLA alleles. D. Identical twins are the same sex. E. None of these is true.
No two people are genetically identical, except for identical twins. The chief cause of genetic variation among human individuals is
A) new mutations that occurred in the preceding generation. B) the reshuffling of alleles in sexual reproduction. C) genetic drift due to the small size of the population. D) geographic variation within the population. E) environmental effects.