Autoimmune disorders are caused by ____
a. lymphocytes that target "self" cells
b. B cell activation
c. impaired innate immunity function
d. T cell activation
e. the inability to make antibodies
ANSWER: a
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A mutualism in which each species can live without the other is termed
A. a facultative mutualism. B. an obligate mutualism. C. a trophic mutualism. D. a dispersive mutualism. E. a defensive mutualism.
The defining trait of hominins is
a. large brain. b. shoulder that can rotate 360 degrees. c. bipedalism. d. extended care of young. e. nails on fingers and toes
The cross section in Figure 31-6 is representative of the internal structures found in:
A. phoronids.
B. nemerteans.
C. Diplopoda.
D. Polyplacophora.
E. oligochaetes
If Hypothesis 1 (traits are linked) had been correct, what offspring ratios would Mendel have predicted in the F2 generation?
A: All round yellow B: 3 round yellow: 1 wrinkled green C: 3 round green: 1 wrinkled yellow D: 9 round yellow: 3 round green: 3 wrinkled yellow: 1 wrinkled green