Cnidarians have _____ symmetry
A. no
B. radial
C. bilateral
D. circular
B
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Grain size in the intertidal is primarily determined by:
a. wave activity. b. types of animals in the area. c. amount of sunlight. d. feeding types in the sediment. e. burrowing activity of infauna.
Complement can be activated by all of the following except __________.
A) contact with a pathogen B) mannose-binding lectins C) opsonization D) antigen-antibody binding E) presence of host tissue
Which of the following bacteria is a common soil contaminant that may cause disease in humans?
A) Aspergillus oryzae B) Bacillus anthracis C) Cyanobacteria D) Lactoccocus cremoris E) Streptomyces scabies
What is happening during the latent period of a muscle twitch?
A. The muscle relaxes and returns to its former length. B. The neurotransmitter is diffusing across the synaptic cleft, causing an electrical signal in the muscle cell. C. The myosin-actin cross-bridges are broken and the sarcomere shortens. D. ADP and phosphate are released, and the power stroke of the contraction occurs. E. Fresh ATP binds to the myosin, causing it to return to its resting position.