Sustained muscle contraction without relaxation between successive stimuli is called _____
A) tonus
B) tetanus
C) an all-or-none response
D) fatigue
E) a spasm
Answer: B
Biology & Microbiology
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Plasmids that govern their own transfer are known as
A) transformable. B) transmutable. C) conjugative. D) transfective.
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True or false: Biomes are strictly terrestrial systems
A. true B. false
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Callose has what effect on pollen?
A. aids differentiation and attachment of pollen to the carpel B. aids pollen development and helps pollen tubes to grow C. aids pollen coat development D. aids pollen coloration E. aids the separation of pollen grains from the anther
Biology & Microbiology
Specific recognition between cell types such as leukocytes and endothelial cells of blood vessels is mediated by cell-surface glycoproteins called
a. selectins. b. fibronectins. c. spectrins. d. porins.
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