The kidneys of sharks excrete ions of:
a. urea.
b. salts.
c. calcium and magnesium.
d. trimethyamine oxide.
e. ammonia.
B
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Match the following descriptions (A-C) with the terms in the table. These descriptions may be used more than once or not at all
a. an extracellular matrix component b. a cell adhesion molecule c. part of the cytoskeleton 1. lignin 2. collagen 3. integrin 4. actin 5. microtubule 6. cellulose 7. middle lamella 8. cadherin 9. tubulin 10. keratin 11. pectin 12. intermediate filament 13. microfilament What will be an ideal response?
The genetic material of all living organisms is
a. protein. b. deoxyribonucleic acid. c. ribonucleic acid. d. glycoprotein. e. polypeptide.
According to the redundancy hypothesis, species are redundant if
A. they have an effect on the ecosystem that is disproportionate with their abundance. B. they could be eliminated or replaced by others with no loss of ecosystem function. C. their ecological niche overlaps somewhat with another species. D. they have grown beyond their carrying capacity for a particular ecosystem.
Why is territoriality an adaptive behavior for songbirds maintaining populations at or near their carrying capacity?
A) Songbirds expend a tremendous amount of energy defending territories so that they spend less time feeding their young and fledgling mortality increases. B) Only the fittest males defend territories and they attract the fittest females so the best genes are conveyed to the next generation. C) Songbird males defend territories commensurate with the size from which they can derive adequate resources for themselves, their mate, and their chicks. D) Many individuals are killed in the ritualistic conflicts that go along with territorial defense. E) Songbirds make improvements to the territories they inhabit so that they can all enjoy larger clutches and successfully fledged chicks.