Genetic engineering has
A. reduced genetic diversity.
B. expanded scientists' ability to modify domesticated plants and animals.
C. created entirely new species.
D. produced interspecific hybrids.
B. expanded scientists' ability to modify domesticated plants and animals.
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How do myelin sheaths increase the speed with which action potentials are propagated along an axon?
A) They increase the permeability of Na+ ions in the plasma membrane. B) They amplify the action potential by increasing sodium influx along the entire distance of the neuron. C) They cause action potentials to "jump" down the axon rather than travel in a continuous path along every site on the axon.
The human placenta is formed by the interaction of uterine tissue and what extraembryonic tissue?
A. amnion B. embrion C. chorion D. yolk sac E. allantois
How would the two cells be affected by inactivating these proteins?
You are investigating two temperature-sensitive mutant cells. In one, you can inactivate shugoshin activity by raising the temperature slightly at the start of meiosis. In the other, you can similarly inactivate separase activity by raising the temperature. What will be an ideal response?
Many sponges, cnidarians, and echinoderms have few if any external characteristics distinguishing males from females. This seemingly odd structural characteristic is most likely associated with which of these functions?
A) substrate feeding B) reproducing asexually only C) reproducing by spawning (simultaneous release of gametes into the water for fertilization) D) having a gastrovascular cavity that takes up most of the internal space.