The nerve cell that controls skeletal muscle contraction is the ____
a. T-tubule
b. troponin neuron
c. spinal neuron
d. motor neuron
e. motor axon
ANSWER: d
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The bodies of arthropods are supported mainly by ____
a. an exoskeleton b. only nonskeletal structures c. a hydrostatic skeleton d. an endoskeleton e. joined exo- and endoskeletons
Mendel's dihybrid crosses (but not his
monohybrid crosses) showed that
a. some genes were linked together. b. the two alleles controlling a trait were divided equally among the gametes. c. alleles for different traits were inherited independently. d. one of the pair of alleles is dominant to the other. e. the crossing of two different homozygous forms will not produce any offspring in the first generation that would look like either of the parents.
The layering of sediments above fossil remains is called ____
a. sedimentation b. divergence c. stratification d. entombment e. layering sequence
All of the following are used by bacteria to attach to host cells EXCEPT
A) M protein. B) ligands. C) fimbriae. D) capsules. E) A-B toxins.