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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology