Which organism is more likely to go extinct-one with a specialized, narrow niche or one with a broad, generalized niche? Explain your answer.
What will be an ideal response?
Organisms with fairly specialized niches are more likely to go extinct than those with broader niches. An organism with a specialized niche will suffer more when the habitat is altered because it uses resources in a very specific way. If there is a change in the resources, it cannot use others, so it will perish. A generalist can use alternatives when its favored resource is lacking.
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The protrusible rasping organ in a mollusk's mouth that is used to scrape food from the substrate is:
A. a veliger B. a visceral mass C. composed of nacre D. a radula E. an ammonite
The lac repressor is
A) active when glucose is present. B) inactive when glucose is present. C) active when both glucose and lactose are present. D) induced when cAMP is present. E) rarely active.
After infection occurs, the second line of defense for a host against a parasite, which is elicited when a foreign object, such as a virus or bacterium, enters the bloodstream, is referred to as a(n) ________ response
Fill in the blank(s) with correct word
A fistula is a crater-like lesion in the skin or mucous membrane.
a. true b. false