Temperature-sensitive alleles that kill an organism only in a particular temperature range are examples of ________.
a. semilethal alleles
b. lethal alleles
c. conditional lethal alleles
d. essential genes
e. nonessential genes
Ans: c. conditional lethal alleles
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Why are steroids considered lipids?
a. Because they are soluble in polar solvents. b. Because they are not soluble in polar solvents. c. Because they are soluble in polar solvents at certain temperatures. d. None of the above.
An ecosystem is made up of ____
a. only plants, animals and fungi b. organisms and nonliving things c. only rocks and minerals d. only plants, protozoa, and fungi e. the biosphere of the region
To be considered _____, an introduced species must begin breeding in its new location and spread widely from its point of introduction.
A. resourceful B. harmful C. native D. dominant E. invasive
The water-hating hydrophobic tails of the phospholipid bilayer face the outside of the cell membrane
Indicate whether the statement is true or false.