Callaway and Aschehoug's study concluded that an invasive Eurasian grass species can outcompete native North American grasses through
A. faster seed germination.
B. secretion of allelochemicals.
C. anti-herbivore compounds.
D. producing more viable seeds.
E. producing seeds year-round.
Answer: B
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In addition to the clonal deletion of self-reactive T cells that occurs during embryonic development, autoreactivity of T cells and B cells is also inhibited by T ________ cells.
What will be an ideal response?
When you consider the contribution of NADH and FADH2, how many of the 32 total ATP molecules
produced in cellular respiration come from the citric acid cycle?
a. 32 b. 28 c. 24 d. 20 e. 16
The enzyme that HIV uses to copy its RNA into DNA is
A. RNA integrase. B. transcriptase. C. reverse transcriptase. D. DNA polymerase. E. RNA polymerase.
Which of the following stages occurs immediately after the development of the zygote?
A. the development of the proembryo B. the heart stage when the cotyledon develops C. the development of globular stage D. the torpedo stage embryo forms