The AIDS virus becomes established in cells bearing the ________ receptor.
Fill in the blank(s) with the appropriate word(s).
CD4
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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.
Which of the following processes does not generate genetic variation during sexual reproduction?
A) Crossing over B) Independent assortment C) Random fertilization D) All of the processes above generate genetic variation
The gradualistic model of speciation is supported by many transitional forms.
a. true b. false
The three-dimensional shape of a protein is its ________ structure.
A. primary B. secondary C. tertiary D. quaternary