Describe the conditions that lead to osteoporosis
What will be an ideal response?
Osteoporosis is a condition in which the bones become brittle, and may easily fracture. It is due to the activity of cells that remove minerals from bones, and can be seen particularly in the loss of spongy bone. Women are more susceptible to osteoporosis after menopause. Regular exercise can help prevent this loss of bone.
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If the antenna complex did not exist in a particular plant mesophyll cell, what effect would that have on photosynthesis?
A. These cells would be unable to absorb any light energy. B. These cells would have a reduced capacity to generate glucose. C. There would be no expected effect on photosynthesis. D. These cells would be able to fix more carbon dioxide.
Why is snail fever a common name for infections with Schistosoma?
A) The worms look like snails. B) They are contracted by eating snails. C) Snails are the intermediate host. D) Physical contact with snails may result in infection. E) The larval stage looks like a snail.
Evaluate and explain the importance of positional information and morphogens in induction
What will be an ideal response?
Meselson and Stahl grew cells in media that contained different isotopes of nitrogen (15N and 14N) so that the DNA molecules produced from these different isotopes could be distinguished by mass
A. Explain how "light" DNA was separated from "heavy" DNA in the Meselson and Stahl experiments. B. Describe the three existing models for DNA replication when these studies were begun, and explain how one of them was ruled out definitively by the experiment you described for part A. C. What experimental result eliminated the dispersive model of DNA replication?