Meiosis in an ovule produces _____ megaspores
a. two c. six
b. four d. eight
B
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Tuberculin skin testing
A. uses a purified protein filtrate of Mycobacterium tuberculosis. B. will be positive in active TB. C. involves the injection of PPD intradermally. D. will be positive if person has had previous exposure. E. All of the choices are correct.
When a patch of land is cleared in a tropical rainforest, the vegetation is often burned to enrich the soil with nutrients from the burned plant material. What description applies to this situation?
A) This works well because so many nutrients are trapped in tropical plants. B) This works for a few years, but the soil is soon depleted of nutrients. C) This isn't necessary because tropical soils are filled with nutrients. D) This helps to promote long-term sustainable agriculture.
Primary and secondary antibody response differ in all the following ways, except
A. the lag period between antigen stimulation and antibody response is shorter in the secondary response. B. IgG production predominates in secondary responses. C. primary responses are active whereas secondary responses are passive. D. the rate of antibody production is faster in primary responses than in secondary responses.
Male deer have large antlers that are used to challenge each other in fights for territory and females. The females of this group actively choose the strongest males. Which type of sexual selection is occurring with the deer population?
A. Intersexual and intrasexual selection are both occurring. B. Intrasexual selection. C. Stabilizing selection. D. Negative frequency-dependent selection. E. Intersexual selection.