Given the information in this chapter, why do you suppose that the rabies virus attacks mammal nervous systems but not those of crocodiles?
What will be an ideal response?
The cells of the crocodile nervous system clearly have different receptors on their surfaces from those found on the cells of mammals. The molecules on the surface of the rabies virus would not fit into the receptors found on the surface of crocodile cells but would fit into those on the surface of mammal cells.
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Which is untrue of the portals of exit of a pathogen from the human body
a. Portals of exit are commonly the same as portals of entry b. Include secretions, excretion, discharge c. Can be shed or slough tissue d. All of the above are true
What is unusual about the [psi-] and [PSI+] phenotypes in yeast?
What will be an ideal response?
A wildlife biologist might be more likely than the average person to contract which types of atypical pneumonia?
A) tularemia, chlamydophila pneumonia, and psittacosis B) Legionnaire's disease and psittacosis C) Legionnaire's disease and Q fever D) Q fever, psittacosis, and tularemia E) walking pneumonia, chlamydophila pneumonia, and Legionnaire's disease
Tinbergen observed that after gull nestlings hatch, the parents remove the eggshells from the nest. To understand why (ultimate causation), he painted chicken eggs to resemble gull eggs, which had camouflage coloration to allow them to be inconspicuous against the natural background. He distributed them throughout the area in which the gulls were nesting, placing broken eggshells with their prominent white interiors next to some of the eggs. As a control, he left other camouflaged eggs alone without eggshells. He then noted which eggs were found more easily by crows. Because the crows could use the white interior of a broken eggshell as a cue, they ate more of the camouflaged eggs that were near eggshells. Tinbergen concluded that eggshell-removal behavior is adaptive:
it reduces predation and thus increases the offspring's chances of survival.What legitimate factors might lead a scientist to do an imperfect version of an experiment, such as using chicken eggs as a stand-in for gull eggs? (Check all that apply.)A) Because the scientist doesn't care about proper procedureB) The perfect experiment is too expensive.C) The perfect experiment would harm the study species.D) To quickly get preliminary data for a grantE) IgnoranceF) The perfect experiment would take too much time. What will be an ideal response?