A covalent bond between two atoms is formed as a result of the ______________
(a) sharing of electrons.
(b) loss of electrons from both atoms.
(c) loss of a proton from one atom.
(d) transfer of electrons from one atom to the other.
(a)
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An epitope is part of an antibody's:
A. constant region of a heavy chain. B. antigen. C. hypervariable region. D. fab fragment.
Which of the following events is believed to have occurred first?
a. endosymbiotic origin of mitochondria b. origin of cyclic pathway of photosynthesis c. endosymbiotic origin of chloroplasts d. origin of noncyclic pathway of photosynthesis
Which cells would be ignored in most instances by lymphocytes?
a. cells coated with complement proteins b. cells with antigens on their surface c. "self" cells with MHC markers d. cells with both antigen and self-MHC markers e. cells with damaged or mutant self-MHC markers
Some combination of heat production and warm clothing are necessary to maintain body temperature when ambient temperatures are less than:
What will be an ideal response?