Which of the following is true about temporal variation in community biomass?
A. It is a characteristic of high species richness.
B. It increases with increases in species richness.
C. It decreases with increases in species richness.
D. It is predicted by the intermediate disturbance hypothesis.
E. It is predicted by Clements' organismic model of community function.
C. It decreases with increases in species richness.
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Molecular homology can be compared by analyzing the
A. sequences of amino acids of various proteins in different species. B. elemental makeup of different species. C. positions of genes on the chromosomes of different species. D. vestigial structures of different species. E. protein structure during development.
Different forms of a gene are known as
a. alleles. b. hybrids. c. recessives. d. genotypes. e. phenotypes.
Why is organ transplantation challenging?
A) Organs cannot be grown in the laboratory. B) Identical twins cannot donate organs to each other by law. C) T cells from the immune system attack transplanted tissue. D) To harvest a donor's organs, the donor needs to be dead for at least 24 hours.
Which excitatory neurotransmitter is responsible for muscle contraction in vertebrates?
A. dopamine B. norepinephrine C. nitrous oxide D. glutamate E. acetylcholine