Which of the following most accurately describes the flow of information for retroviruses?
A) DNA ? protein
B) RNA ? protein
C) DNA ? RNA ? protein
D) protein ? RNA ? DNA ? protein
E) RNA ? DNA ? RNA ? protein
Answer: E
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Choose the true statement(s) about the evolutionary divergence of horses in North America. Check all that apply.
_____ Most changes are seen as adaptations for life in grassland habitats. _____ The general trends during horse evolution are increase in body size, lengthening of limbs, reduction of digits on both sets of limbs, and tooth development for a grazing life style. _____ Horse evolution is unusual in that rates of change were uniform and constant throughout most lineages. _____ Living lineages of horses show much less diversity than existed in the past.
An amino acid that cannot by synthesized by cellular biochemical pathways (and therefore must be obtained from the diet) is called a(n) ____ amino acid
Fill in the blank with the appropriate word.
Which one of the following separates neighboring vertebrae and also functions as shock absorbers?
A) ribs B) palatine bones C) intervertebral disks D) intravertebral disks E) osteons
You have added a specific amount of excitatory neurotransmitter mixed with a 6× higher concentration of an inhibitory neurotransmitter to a synaptic cleft. You expect that the postsynaptic neuron will
A) produce 6× its normal number of action potentials. B) produce 6× its normal number of negative action potentials. C) show a net hyperpolarization as a result of neuronal integration. D) show a net depolarization as a result of neuronal integration. E) not respond to either signal.