The excretory organs of different organisms are extremely varied. What do all excretory organs have in common?
A. a filtration system that results in a filtrate
that is more concentrated than the body fluids
B. a filtration system that filters nitrogenous
waste from the body fluids
C. a filtration system that relies on active
transport to alter initial osmolarity of the
filtrate
D. a filtration system that relies on extensive
tubules with high surface area-to- volume
ratio to remove wastes
B
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The genomes of free-living spirochaetes are larger than those living in animal hosts. Why might this be so?
A. Free-living spirochetes will need genes to code for additional proteins to synthesize or obtain their own food from the environment around them. Parasitic spirochetes obtain nutrients from the animal host, and may not need to move towards those nutrients either. B. The spirochetes in animal hosts are different species entirely. As different species, they would naturally have smaller genomes. C. A smaller genome implies simplicity-the spirochetes living in animal hosts have fewer needs, so they need fewer genes. D. It isn't so-all spirochetes would have the same size genomes, since they're all the same species of microbe.
Plants can reduce water loss by
A) closing their stomata. B) growing larger leaves. C) growing more slowly. D) increasing photosynthesis.
_____ and ________ are tumor suppressor genes.
Fill in the blank(s) with the appropriate word(s).
When a cell loses control over its replication cycle, _____.
A) the cell can divide over and over with no interphase B) the cell may not die as it is supposed to C) damaged chromosomes may be replicated D) all of the choices