Methicillin is an example of the beta-lactam class of drugs that
A. disrupts cytoplasmic membranes.
B. inhibits cell wall synthesis.
C. inhibits nucleic acid synthesis.
D. inhibits metabolic pathways.
E. inhibits protein synthesis.
Answer: B
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Tamoxifen is a drug that is used to treat breast cancer. It inhibits the activities of the estrogen receptor in breast epithelial cells, which are the cells that are relevant to breast cancer. One of the concerns that scientists had during the development of Tamoxifen as a therapy for breast cancer was that other cell types require estrogen signaling for their function. For example, it is known
that cells in bone tissue require estrogen signaling. As a result, there was a concern that use of Tamoxifen would lead to bone loss in patients. In reality, however, researchers were surprised to find that Tamoxifen actually led to an increase in bone density in breast cancer patients. At the same time, Tamoxifen did inhibit the activity of the estrogen receptor in breast epithelial cells in these patients. What is the best explanation for this finding? A. Tamoxifen binds different parts of the estrogen receptor in different tissues. B. The estrogen receptor is bound to different coactivators in different tissues. C. Tamoxifen can only enter certain cell types. D. Bone cells make use of a different type of estrogen receptor that does not bind to Tamoxifen.
Head lice are a common pest. How long can they live away from a human host?
a. Only a short time b. Several days c. Several weeks d. Up to one year if they are warm
A crayfish is a member of the phylum
A) Echinodermata. B) Mollusca. C) Annelida. D) Platyhelminthes. E) Arthropoda.
Nutrients can be concentrated from dilute solutions by ________.
A. electron transport B. pinocytosis C. endocytosis D. active transport and group translocation