A basic difference between self-pollination and cross-pollination is:
A. the method of pollen delivery
B. whether insects are involved in pollination
C. where the pollen came from
D. whether the pollen germinated
E. how often pollination occurs
C. where the pollen came from
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What are epithelial cells with a flat, irregular shape and tapered edges called?
A. columnar B. pseudostratified C. squamous D. cuboidal E. stratified
The ability of some rats to become resistant to Warfarin was due to ________
a. a gene for resistance b. their ability to convert Warfarin to a non-toxic substance c. the different blood clotting mechanisms present in rats d. their ability to detect and avoid Warfarin e. the decreased use of Warfarin in urban environments
Individuals with neurofibromatosis may have a range of phenotypes, from pigment spots on the skin to tumorlike growths. This is an example of
A) incomplete penetrance. B) variable expressivity. C) age of onset. D) X-inactivation. E) gene magnification.
Explain how scientists used artificial vesicles to prove that the generation of ATP by the ATP synthase was not powered by a single high-energy intermediate but rather by a proton gradient
Be sure to describe the two experiments that were negative controls (no ATP generated), the positive control (ATP generated as expected), and a fourth experiment proving that the gradient is the required energy source.