Based on the Luria–Delbrück experiment, mutations that provide plants with the ability to survive on toxic soils should occur:
a. only in populations living on toxic soils.
b. in all plant populations.
c. randomly.
d. A and B.
e. B and C.
E
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Genome databases have been created for all of the following model organisms except for which one?
A. fruit fly B. mice C. humans D. bacteria E. alligator
Which of these is not a component of cell walls in plants?
1.cellulose 2.chitin 3.lignin 4.pectin
Carl Woese's evolutionary studies that led him to propose the three domain taxonomic system compared nucleotide sequence present in:
A) the nuclei of eukaryotic cells B) 16S rRNA genes C) cyanobacteria D) thermophiles E) DNA polymerase genes
Beyond maintaining water balance in the blood, the kidneys
A. help to maintain the blood pH. B. maintain blood volume. C. aid in regulation of blood pressure. D. All of the choices are kidney functions.