Respond to the following statements in reference to the five items listed below. Answers may be used more than once or not at all.
A. An Rh+ molecule in the body of an Rh woman is an example of these.
B. These bind, as in a lock-and-key mechanism, to foreign proteins.
C.
D. These directly attack the foreign cells of an incompatible skin graft.
E. These produce immunoglobulins in response to the reinvasion by a virus.
F. Proteins produced by these bind to bacteria and viruses in the blood.
A. antigens
B. antibodies
C. helper T cells
D. cytotoxic T cells
E. effector B cells
F. effector B cells
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Brachiopods develop as protostomes, but they show ______ cleavage.
Fill in the blank(s) with the appropriate word(s).
Tree rings are formed by growth in the ________
a. epidermis b. vascular cambium c. periderm d. cortex
A high level of far-red light simulates shady conditions to a plant.
a. true b. false
Sensory receptors respond to changes in the environment called ________
Fill in the blank(s) with correct word