amino acids that cannot be produced by the body are called ___ amino acids
Fill in the blank(s) with the appropriate word(s).
essential amino acids
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Reactivation of chickenpox is called
A. shingles. B. herpes zoster. C. pneumonia. D. exanthems. E. shingles AND herpes zoster.
Spy hopping is a term given to whales when they:
a. jump out of the water. b. partially get their body out of the water. c. capture their food. d. mate. e. play in groups.
A maple tree's seeds occur in pairs that are enclosed and attached to flat "wings" that are made of a papery tissue. The wings' shape allows them to spin in the air as they fall from the tree; this unusual motion has earned them the nickname "helicopter
seeds." Maple tree seeds are most successful when they are dispersed by A) wind. B) water. C) mammals. D) birds.
What molecules are released by activated helper T cells?
A. Cytokines B. Antibodies C. Immunoglobulins D. Antigens