Support for the succession mechanism of tolerance is found in research on plant communities that shows
A. that plants release toxins that prevent other species from establishing.
B. succession is random and cannot be predicted by existing species.
C. climax communities never form as predicted by Clements.
D. succession is determined largely by species that exist in the ground as seeds or old roots.
E. competition-tolerant species colonize first.
D. succession is determined largely by species that exist in the ground as seeds or old roots.
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Aspergillus and Penicillium are similar in that both ____
a. produce antibiotics b. reproduce sexually using an ascus
c. are club fungi d. parasitize human mucous membranes e. lack known sexual stages
Which of the following organs of the endocrine system secretes melatonin?
a. pituitary gland b. pancreas c. pineal gland d. adrenal glands e. thyroid gland
Viruses that attack prokaryotes are called
A) bacteriophages. B) prions. C) human pathogens. D) viroids. E) host cells.
The ordering of bases in a gene determines the order of:
A) mRNAs on a ribosome. B) genes on a chromosome. C) amino acids in a protein. D) genes in a genome.