An important mediator of a type I hypersensitivity reaction is
a. complement.
b. antigen-antibody immune complexes.
c. T cells.
d. histamine.
Ans: d. histamine.
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Which amino acid can be involved in special covalent "disulfide bridges" that, when present, help to stabilize the
tertiary and quaternary structure of proteins?
a. proline b. alanine c. leucine d. cysteine e. methionine
The archaeplastids include the red algae and the green algae
________________ Indicate whether the statement is true or false.
Snapping division occurs in bacteria with a two-layered cell wall because only the ________ layer grows inward to generate a septum.
Fill in the blank(s) with the appropriate word(s).
The cell walls of mycobacteria make them vulnerable to water soluble chemical agents.
Answer the following statement true (T) or false (F)