If at the last minute the pitcher decides to throw a curveball, which tissue responds first?
A. muscle tissue
B. epithelial tissue
C. nerve tissue
D. ectoderm
Answer: C
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The ____ of the eye focuses light on the eye's
photoreceptors. In the above diagram of the eye, which letter identifies it?
a. retina; C b. lens; B c. lens; A d. fovea; D e. retina; B
Imagine that you are performing a cross involving seed texture in garden pea plants. You cross true-breeding round and wrinkled parents to obtain F 1 offspring. Which of the following experimental results in terms of numbers of plants are closest to what you expect in the F 2 progeny?
a) 810 round seeds b) 405:395 round seeds:wrinkled seeds c) 610:190 round seeds:wrinkled seeds d) 810 wrinkled seeds
Scientists investigating speciation in fruit flies divided a single population of flies into separate populations that each lived in their own cage on one of two food sources: maltose-based food or starch-based food. After several generations, the flies' mate preference was tested, and it was found that flies strongly preferred to mate with other flies that were raised on the same food source. This result suggests that
A. selection on reproductive isolating mechanisms indirectly led to the evolution of different food preferences. B. reproductive isolating mechanisms evolved primarily through genetic drift. C. selection on food source indirectly led to the evolution of reproductive isolating mechanisms. D. different food preferences evolved primarily through genetic drift.
Which of the following is thought to be the major promoter of fatty plaque buildup in the coronary arteries?
What will be an ideal response?