Select the concepts emphasized by Ernst Mayr's biological species concept. Check all that apply.A) Hybridization between different speciesB) Production of fertile offspring within the speciesC) Populations in zoosD) Reproductive isolation from other species
What will be an ideal response?
B, D
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Which of the following proteins is responsible for advancing a cell through the four phases of the cell cycle?
A. caspases B. cyclins C. claudins D. endonucleases E. cofactors
Select the formula below that correctly represents the behavior of CO2 in the blood.
A. CO2 + H2O ? H2CO3 + CO B. CO2 + H+ ? HCO3+ ? H2O + H2CO3 C. CO2 + HCO3- ? H+ + H2O + H2CO3 D. CO2 + H2O ? H2CO3 ? HCO3- + H+ E. CO2 + H2CO3 + O2 ? H2O + CO2 + H2CO3
Biological nitrogen fixation is accomplished by
A) protozoans. B) bacteria. C) fungi. D) plants.
For individuals planning a trip to another country, such as Vietnam, which organization is the best source for information on which vaccines might be necessary?
a. Centers for Disease Control and Prevention b. National Institutes of Health c. National Safety Council d. Tourist Travel Bureau