Temperature-sensitive alleles are examples of _________
A. essential genes
B. lethal alleles
C. semilethal alleles
D. nonessential genes
E. conditional lethal alleles
E
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In general, in a sample of n individuals, the frequency of an allele is
A. the number of occurrences of the allele. B. the number of occurrences of the allele divided by n. C. the number of occurrences of the allele divided by twice the number of individuals in the sample (2n). D. twice the number of occurrences of the allele divided by n.
Gut-dwelling ____ help cattle, sheep and related grazing animals break down ____ in plant material
a. ciliates; chlorophyll b. apicomplexans; cellulose c. dinoflagellates; cellulose d. dinoflagellates; chlorophyll e. ciliates; cellulose
When calcium levels rise, the __________ secrete(s)
__________, which __________ osteoclast activity. a. parathyroids; calcitonin; suppresses b. thyroid; calcitonin; suppresses c. thyroid; calcitonin; enhances d. thyroid; PTH; suppresses e. parathyroids; PTH; enhances
Which of the following produces the most potent endotoxin
A. Clostridium tetani B. Neither Clostridium tetani nor Clostridium botulinum C. Both Clostridium tetani and Clostridium botulinum D. Clostridium botulinum