Species of Rhizobium and Bradyrhizobium bacteria are most directly associated with ____
a. nitrification
b. ammonification
c. nitrogen cycling
d. nitrogen fixation
e. nitrogen assimilation
ANSWER: d
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There are three giant redwoods in California that a person can actually drive through. Imagine that you look up right when you are in the middle of driving through the tree and continue looking up until you exit out the other side
What order of structures would you see as you were driving through the tree? A. pith, phloem, xylem, vascular cambium, cork B. pith, vascular cambium, phloem, xylem, cork C. pith, xylem, phloem, vascular cambium, cork D. pith, xylem, vascular cambium, phloem, cork E. pith, phloem, vascular cambium, xylem, cork
The theory of segregation
a. deals with the alleles governing two different traits. b. applies only to linked genes. c. applies only to sex-linked genes. d. explains the behavior of a pair of alleles during meiosis. e. applies only to autosomes.
Which of the following observations provides the strongest evidence against root pressure being the principal mechanism of water transport in the xylem?
A) Not all soils have high concentrations of ions. B) Root pressure requires movement of water into the xylem from surrounding cells in the roots. C) Over long distances, the force of root pressure is not enough to overcome the force of gravity. D) There is no water potential gradient between roots and shoots.
The biological species concept of Ernst Mayr cannot be applied to
A. asexually reproducing organisms. B. sympatric organisms. C. prokaryotic organisms. D. allopatric organisms. E. eukaryotic organisms.