Genetic diagnosis by DNA testing
a. detects only mutant and not normal alleles.
b. can be done only on eggs or sperm.
c. involves hybridization to rRNA.
d. often uses restriction enzymes and a polymorphic restriction site.
e. cannot be done with PCR.
Answer: d. often uses restriction enzymes and a polymorphic restriction site.
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A mother ship arrives from Planet Lichen to take all lichens on Earth back to their home planet. Which of the following would be consequences of the removal of lichens from Earth? Check all that apply.
_____ Levels of chemical pollutants in the air can no longer be monitored using lichens. _____ Levels of radiation in the soil can no longer be monitored using lichens. _____ Soil formation by breaking down parent rock will increase as lichens can no longer impede the process. _____ Nitrogen fixation will decrease.
Cell-mediated immunity most directly involves the destruction of diseased and/or cancerous cells by ____________
Fill in the blank(s) with the appropriate word(s)
Osteoclasts function in bone remodeling to
a. free mineral ions. b. stimulate blood cell formation. c. accelerate bone repair. d. lay down a bony matrix. e. do all of these.
________ are events that have a greater impact on the population as conditions become more crowded
Fill in the blank(s) with correct word