Why are lipids and proteins free to move laterally in membranes?
A) The interior of the membrane is filled with liquid water.
B) Lipids and proteins repulse each other in the membrane.
C) Hydrophilic portions of the lipids are in the interior of the membrane.
D) There are only weak hydrophobic interactions in the interior of the membrane.
D
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Athlete's foot is caused by
A. Aspergillus. B. Ergot. C. Candida. D. Claviceps. E. None of the choices provided.
A woman with normal blood clotting mates with a man who has hemophilia. Their first child is a boy who has
hemophilia. Tests show that the father and son both have the same form of hemophilia, that it is X-linked, and that the boy has normal genetic inheritance. You can predict that if the couple has more children together, it is likely that ____.
a. all of the children will have hemophilia b. half of the boys and none of the girls will have hemophilia c. none of the other children should have hemophilia d. all of the boys and half of the girls will have hemophilia e. half of the boys and half of the girls will have hemophilia
Janey has been taking antibiotics for 10 days to counter a urinary tract infection caused by E. coli. Her UTI is eliminated, but two weeks later she has a vaginal itch. What is the likely cause?
A. Clostridium difficile B. Escherichia coli C. Lactobacillus acidophilus D. Staphylococcus aureus E. Candida albicans
What is the advantage of having grape-like clusters called alveoli as part of the respiratory system?
A) Alveoli allow for an increase in surface area, which maximizes gas exchange. B) Alveoli are circular in structure, which is ideal for maximal gas exchange. C) Because alveoli have thinner walls, gas exchange in the lungs is facilitated. D) The grape-like shape of alveoli allows capillaries to be in closer proximity to gases.