Mutations are the original source of new alleles, but may be adaptive, __________ or __________. Fill in the blank(s) with the appropriate word(s)
ANSWER:
lethal; neutral
neutral; lethal
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It is difficult to estimate when cyanobacteria appeared on Earth using evidence from the oxidation state of the Earth's crust, because
A) several abiotic reactions could have formed Fe3+. B) there are multiple forms of anoxygenic photosynthesis. C) there are multiple groups of oxygenic photosynthetic bacteria. D) several ancient anaerobic metabolisms form Fe3+.
Contact dermatitis involves
A. T lymphocytes secreting inflammatory cytokines. B. an allergen entering the skin. C. a sensitizing and provocative dose. D. the production of itchy papules and blisters. E. All of the choices are correct.
________ occurs when a chemical signal secreted by the roots of one plant blocks the germination of nearby seeds or inhibits the growth of a neighboring plant.
A. Etiolation B. The systemic response C. Allelopathy D. Nodulation E. Reduction
During translation, nucleotide bases are read ___ at a time.
a. four b. two c. three d. one