What are antibodies?
A) Bacteria
B) Proteins produced by B cells that bind to foreign proteins
C) Cells that undergo apoptosis
D) Viruses
E) Proteins produced by T cells that bind to foreign proteins
B
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The gametophyte of a fern is
(a) haploid. (b) photoautotrophic. (c) a structure that produces eggs and/or sperm. (d) all of the above.
Multiple operons may be controlled by ________ or ________.
Fill in the blank(s) with the appropriate word(s).
Target tissues often have receptors for multiple hormones. The response of the target tissue depends on
a. blood levels of and interactions between the hormones that affect it. b. blood levels of the hormones that affect it. c. interactions between hormones. d. blood levels of and interactions between the hormones that affect it and the effects of other signaling molecules, such as prostaglandins. e. growth hormones levels.
In this diagram of the heart, which of the
following choices correctly identifies A and B?
a. A is the AV node; B is the cardiac pacemaker. b. A is the SA node; B is the septum. c. A is the AV node; B is the SA node. d. A is the SA node; B is the AV node. e. A is the septum; B is the cardiac pacemaker.