The classical pathway for complement activation is initiated by
A) Factors released from phagocytes.
B) Factors released from damaged tissues.
C) Antigen-antibody reactions.
D) Polysaccharides and C3b.
E) C5-C9.
C) Antigen-antibody reactions.
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When cells of a facultative anaerobe such as Paracoccus denitrificans are growing under anaerobic conditions and using nitrate as the terminal electron acceptor, ________ nitrate reduction is occurring.
Fill in the blank(s) with the appropriate word(s).
A tidal pattern of two equal high and low tides per day is called a:
a. mixed semidiurnal tide. b. semidiurnal tide. c. diurnal tide. d. spring tide. e. neap tide.
What step occurred first in the evolution of life?
a. formation of DNA b. formation of protein-RNA systems c. formation of membrane-bound proto-cells d. spontaneous formation of organic compounds under abiotic conditions e. formation of ATP
What is the name given to the viral DNA incorporated into a lysogenic cell?
a. Prophage b. Oncogenic virus c. Latent phage d. Bacteriophage