This figure shows horizontal gene transfer and the early evolution of life. By this diagram, which of the fol-lowing is NOT true?
a. Bacteria have transferred genes to eukaryotes twice.
b. Bacteria have transferred genes to archaea many times.
c. Archaea have exchanged genes with eukaryotes.
d. Bacteria have transferred genes among themselves.
e. Eukaryotes have transferred genes among themselves.
E
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Steroid and thyroid hormones do not bind to membrane surface receptors because they ____
a. are small enough to pass directly through the membrane b. are soluble in the lipid bilayer c. pass through special membrane channels d. are water-soluble e. dissolve in the cholesterol present in cell membranes
What factor do the diseases PKU, albinism, and alkaptonuria all have in common?
What will be an ideal response?
Why scientist randomly sample the population of study?
A. to minimize the deviation from the population. B. to make sure that all the samples are different. C. to easy confirm the null hypotheses. D. to make sure that all samples are similar.
Temperate grasslands and temperate deciduous forests are two different biomes that are located in the same latitudes. Which one of the following abiotic conditions is most likely to account for the differences in their community composition?
A. a rain shadow B. sunlight C. soil nutrients D. temperature E. precipitation