What experimental observation demonstrated that genes are involved in the integration of foreign DNA into the bacterial chromosome?
What will be an ideal response?
Mutations allowed identification of rec genes. When such genes were mutated, integration does not occur.
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Which of the following was an emerging mosquito-borne disease in the early 2000s but has now decreased in frequency?
A) malaria B) Rocky Mountain spotted fever C) typhus D) West Nile fever
Nauplius, a unique kind of larva, is characteristic of
A. mites. B. crustaceans. C. horseshoe crabs. D. insects. E. chelicerates.
Bulk flow in capillaries is driven by ____
a. gravity b. concentration gradients c. actual blood pressure d. pumping of the heart e. reciprocal exchange with oxygen
The African country of Nigeria had a 4.55% population growth rate from 2005 to 2010, the highest in the world. Which of the following statements is consistent with this fact?
A) Nigeria's age structure likely looks like a pyramid with a broad base. B) Nigerian birth rates are likely to be slightly lower than death rates. C) Nigeria is likely in the first phase of the demographic transition. D) Nigerian emigration rates are likely higher than immigration rates.