Which of the following is a characteristic of the third line of defense that makes it significantly different from the second line?
A. The response is specific to a single antigen.
B. The initial response is very rapid, beginning in minutes to a couple of hours.
C. The response is effective on a broad range of antigens.
D. The response to a second exposure is similar to the response to a first exposure.
E. The responding cells are a variety of cell types.
Answer: A
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Almost 70 percent of women with breast cancer are estrogen-senstive. What does this mean?
A. They are made ill with prescriptions of estrogen. B. Only a small amount of estrogen can exacerbate their symptoms. C. Their own natural estrogen encourages the growth of cancer cells. D. Their cancers go into remission with increased uptake of estrogen. E. They do not produce their own estrogen.
ATP is a portable form of energy "currency" inside cells.
a. true b. false
Which class is composed mostly of freshwater parasites called leeches?
a. Hirudinea b. Oligochaeta c. Cestoda d. Polychaeta
Traditional animal phylogenetic trees and the most recent molecular phylogenetic trees have many similarities. Which is a feature of the recent trees that was not present in the traditional phylogeny?
A) the placement of Echinodermata and Chordata together in a clade of deuterostomes B) the status of sponges as the first group to diverge from the other animals C) the grouping of nematodes and arthropods into a clade called the Ecdysozoa D) the grouping of all bilaterally symmetric animals within a single clade