Which of the following genetic mechanisms promotes the development of a pandemic strain of influenza A?
A. Reassortment
B. Complementation
C. Conjugation
D. Transcapsidation
E. Recombination
Ans: A. Reassortment
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Crossing over happens during which phase of meiosis?
What will be an ideal response?
The dizzy feeling you encounter when you sit up is being activated by the
A. thermoreceptor in your ear lobe. B. photoreceptor in the skin. C. mechanoreceptor in the vestibular apparatus. D. proprioceptor in the cochlea. E. chemoreceptor in the ear drum.
Which of the following is NOT a function of some
leukocytes? a. engulf and destroy damaged or dead cells b. engulf anything recognized as “nonself” c. call up specific immune responses d. carry out specific immune responses e. secrete substances that initiate blood clotting
Which of the following types of reproductive barriers separates a pair of insect species that could interbreed but for the fact that one lives on goldenrod plants and the other on autumn daisies in the same general area?
A) temporal isolation B) habitat isolation C) behavioral isolation D) gametic isolation