In Table 12.1, which spore is in a sac and results from the fusion of two nuclei from different strains of the same fungi?
A) 1
B) 2
C) 4
D) 6
E) 8.
Answer: B) 2
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Natural selection operates directly on
(a) the genotype. (b) individual alleles. (c) the phenotype. (d) color only.
Which of the following could alter the level of expression of a gene?
A. an increase in environmental temperature B. an increase in salinity C. exposure to UV radiation D. presence of a particular energy substrate E. All of the choices are correct.
Because of the complexity of the Schistosoma life cycle, there are several parts of the cycle that could be disrupted to halt the spread of the disease. Which of the following proposals is not likely to succeed in decreasing the prevalence of schistosomiasis?
A. Install sanitary sewage treatment facilities to prevent the dispersal of eggs present in urine and feces. B. Apply chemical molluscicides (chemicals targeted to molluscs like snails) to bodies of fresh water. C. Identify a surface protein on Schistosoma miracidia that the immune system can recognize and create a vaccine using that antigen. D. Monitor water bodies to detect the presence of infectious miracidia and enforce no bathing rules when they are present.
The widely-distributed CRISPR system has been found in approximately ________ of archaeal sequenced genomes and in ________ of bacterial sequenced genomes
a. 70 percent / 90 percent b. 90 percent / 70 percent c. 50 percent / 50 percent d. 50 percent / 30 percent