A small marine amphipod has recently been discovered that carries a bad-tasting organism on its back, which is contrary to its normal behavior. If a fish ingests the pair, it immediately spits them back out. If the amphipod is alone, however, it is readily eaten. There is no apparent benefit or harm in this relationship for the "backpack" organism. This is probably a case of
A. competitive exclusion.
B. mutualism.
C. parasitism.
D. commensalism.
Answer: D
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Earth's ozone layer is extremely important because it
A) traps harmful infrared rays. B) blocks incoming UV radiation, which is damaging to animals and reduces photosynthesis in plants and algae. C) blocks incoming visible light to protect Earth against the greenhouse effect. D) maintains high carbon dioxide concentrations so that photosynthesis can occur. E) traps heat so that Earth's temperature does not fall too much.
A(n) __________ is a virus that infects only bacteria.
Fill in the blank(s) with the appropriate word(s).
All organisms have the same resource requirements
a. True, the same resources are required for all life. b. False, although similar resources may be required, the amount of each resource can vary among species
An organism has a mutation in the gene that codes for separase so that no functional separase can be made by this individual. What consequence would occur from this mutation?
a) Sister chromatids would separate prematurely during mitosis. b) During meiosis, sister chromatids would never separate because cohesin could not be broken down but homologous chromosomes would separate. c) Both sister chromatids and homologous chromosomes would never separate because cohesin could not be broken down. d) During meiosis, homologous chromosomes would never separate during meiosis but sister chromatids would separate.