According to the _________________ theory, early undifferentiated lymphocytes in the embryo and fetus undergo a continuous series of divisions and genetic changes that generate hundreds of millions of different cell types, each carrying a particular receptor.
A) Genetic recombination
B) Clonal deletion
C) Molecular mimicry
D) Clonal selection
D) Clonal selection
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Which of the following statements concerning receptors is FALSE?
a. They are found inside the cell and on the cell surface. b. They are proteins or glycoproteins. c. They are also called ligands. d. They are highly selective. e. They are activated by binding to a signaling molecul
Define positive feedback and describe why they are not necessarily beneficial to organisms. Include a
description of the changes associated with severe blood loss and circulatory shock to substantiate your answer. What will be an ideal response?
A plant has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are being absorbed by this pigment?
A) red and yellow B) blue and violet C) green and yellow D) blue, green, and red E) green, blue, and yellow
A viral capsid is composed of individual units of ________ called ________
a. polysaccharides / viroids b. proteins / capsomeres c. glycolipids / viroids d. polysaccharides / capsomeres