Which of the following most accurately summarizes the effects of mutations on living things?
a. most mutations are beneficial and a few are harmful
b. many mutations have little or no effect, but some can be harnful or benficial
c. about half of mutations are beneficial and half are harmful
d. most mutations are harmful, but some have little effect
Ans: b. many mutations have little or no effect, but some can be harnful or benficial
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The deep ocean biome is one that scientists know very little about. Primary producers in this biome cannot utilize sunlight as a source of energy
Which of the following statements provides a plausible description of the energy available to higher trophic levels from primary producers in this biome? A. There are probably only two trophic levels because there is only light available from bioluminescent organisms. B. The higher trophic levels (secondary or tertiary consumers) are probably only represented by one or two species because of the low levels of energy available from primary producers. C. The energy available from primary producers likely comes from the reduction of low-energy molecules (hydrogen sulfide or methane gasses). D. The biome is not stable because there is not a constant source of molecules available for primary producers to convert into biomass.
Corynebacterium glutamicum is used for the large scale industrial production of ________.
A. amino acids B. polysaccharides C. vitamin B1 D. antibiotics
Four of the five animals listed below possess the
same type of skeleton. Select the exception. a. butterfly b. fly c. earthworm d. crab e. grasshopper
The most abundant molecule in the cell is:
A) carbohydrate. B) lipid. C) nucleic acid. D) water. E) protein.