With respect to the outer and inner faces of the lipid bilayer of the cell membrane, the composition of lipids is
A) asymmetrical.
B) identical.
C) not identical but symmetrical.
D) highly random and varies throughout the cell.
E) a mirror image.
A) asymmetrical.
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Human sweat has antimicrobial activity due to
A. production of an antimicrobial peptide called cathelicidins. B. production of low molecular weight compounds that chelate free iron. C. production of low molecular weight compounds that maintain an alkaline pH. D. competition with normal sweat gland flora.
Two plant species live in the same location and flower at the same time, but do not hybridize because they have
unique pollinators. This is an example of ____.
a. hybrid inviability b. hybrid breakdown c. a postmating reproductive mechanism d. a postzygotic reproductive barrier e. a prezygotic reproductive barrier
When only a small amount of ____ remain following several cell divisions, a cell stops dividing and
dies. a. centromeres. b. centrosomes. c. acrosomes. d. telomeres. e. isomers.
Which of the following is true of plant cells?
A) Plant cells may contain chloroplasts. B) Plant cells are always much larger than animal cells. C) Chromosomes are found only in plant cells. D) Only plant cells have a cell membrane. E) The plant cell has no cell wall.