Most genes have many more than two alleles. However, which of the following is also true?
A) At least one allele for a gene always produces a dominant phenotype.
B) Most of the alleles will never be found in a live-born organism.
C) All of the alleles but one will produce harmful effects if homozygous.
D) There may still be only two phenotypes for the trait.
E) More than two alleles in a genotype is lethal.
Answer: D) There may still be only two phenotypes for the trait.
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Quorum sensing
A. depends on the sensing of signal protein molecules. B. is a phenomenon in which bacteria monitor their own population density. C. plays an important role in formation of biofilms by Pseudomonas aeruginosa. D. All of the choices are correct.
Compare the graphs in the figure above of carbon dioxide (CO2) emission for Cormocephalus morsitans and Scutigerina weberi. What hypothesis can you make about each centipede's habitat?
A) C. morsitans lives in a habitat that provides more carbon dioxide than does S. weberi. B) C. morsitans lives in a habitat with more predators than does S. weberi. C) C. morsitans lives in a colder habitat than does S. weberi. D) C. morsitans lives in a drier habitat than does S. weberi.
DNA is replicated during
a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.
Peatlands differ from other wetlands in that
A) the rate of organic production exceeds the rate of decomposition. B) there is no outflow of water, resulting in increasing salinities. C) they are seasonal, filling with water during the wet season and drying out during the dry season. D) they have a two-way flow of water due to tidal action.