What is the name of the unique area (specific region) that a lymphocyte recognizes and binds to?
What will be an ideal response?
an antigenic determinant
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Companion cells are connected via plasmodesmata to
a. trichomes. b. tracheids. c. sieve tube members. d. guard cells. e. vessel members.
Bacteria use restriction enzymes to
a. integrate viral DNA. b. destroy viral DNA. c. prevent mutation of their DNA. d. copy their genes. e. inhibit the expression of some of their genes.
The statement, "Energy is neither created nor destroyed," is a statement of
A) the first law of thermodynamics. B) the second law of thermodynamics. C) entropy. D) enthalpy. E) an early theory of energy that has now been proven false.
If you took a new, strong antibiotic, which vitamin would you most likely need that you didn't need before?
A) vitamin A B) vitamin E C) vitamin K D) vitamin C