What kind of molecule forms a bilayer that is the basis for all cellular membranes?
A) carbohydrate
B) cholesterol
C) phospholipid
D) protein
C
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Some plants use metabolic resources for making flowers smell, while others do not
Indicate whether the statement is true or false.
A mutation that results in a change in the codon-reading pattern could result from
A) either an insertion or a deletion of a base. B) a base substitution only. C) a base deletion only. D) a base insertion only.
Hagfish (Eptatretus cirrhauts) are a jawless marine vertebrate that are isotonic with their environment and are considered to be osmoconformers. How might this interesting adaptation limit the habitat that the hagfish can tolerate?
A) Hagfish are not limited by salinity. B) Osmoconformers do not face the same pressures as osmoregulators and can live in any marine environment. C) Individual hagfish will adapt to different salinities over their lifetime and, therefore, can inhabit any marine environment. D) Hagfish habitat is limited by the salinity of the environment.
Intact skin layers are part of the body's (first/second/third) line of defense against pathogens.
Fill in the blank(s) with the appropriate word(s).