Lake Victoria is famous for its variety of cichlid fishes. In fact, they offer the most diverse assembly of vertebrates presently known to science. One trait that scientists have focused on as one possible reason for their adaptability is
A. a second set of scales that lie beneath the top outermost scales.
B. a second set of jaws in their throats.
C. gill arches that are not covered by an operculum, which prevents hiding places for gill parasites.
D. digestive tracts that are able to process most substrates, which has eliminated the need for feeding specialization.
E. ability to change color in relationship to their environment.
B. a second set of jaws in their throats.
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Answer the following statements true (T) or false (F)
1. The fast block to polyspermy occurs through a rapid increase in cytosolic calcium within the egg. 2. The sperm and its DNA enters the egg through simple diffusion through the egg plasma membrane. 3. The cortical reaction prevents multiple sperm from contributing their chromosomes to the egg. 4. Most of the egg yolk found in certain vertebrates is restricted to the animal pole?
Abscisic acid (ABA) is synthesized in the roots in response to decreased soil water potential. ABA then translocates to the leaves, where it rapidly alters the osmotic potential of guard cells. What effect would this have on the stomata and the process of transpiration?
A. The stomata would open thereby increasing the rate of transpiration. B. The stomata would open thereby decreasing the rate of transpiration. C. The stomata would close thereby decreasing the rate of transpiration. D. The stomata would close thereby increasing the rate of transpiration. E. The change in the stomata would have no effect on the rate of transpiration. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the relationship between transpiration and stomata? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following is the most likely explanation for a particular human population with a higher incidence of polydactyly (extra fingers/toes) than the human population as a whole?
A) directional selection B) disruptive selection C) founder effect D) bottleneck effect
Gene expression involves two phases, translation and ________.
A. initiation B. transcription C. condensation D. replication