Optimal protection of specimen, personnel, and environment is accomplished with which class of biological safety cabinet?
a. Class I
b. Class II
c. Class III
d. Class IV
C
Biological safety cabinets are designated by class according to the degree of biological contain-ment they provide, from the lowest level of containment (class I) to the highest level of contain-ment (class III).
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During long-term potentiation the release of the neurotransmitter glutamate triggers the opening of sodium and calcium channels in the postsynaptic cell, increasing ion flow. What type of channel is responsible for this increase in ion flow?
A. voltage-gated ion channel B. ligand-gated ion channel C. ttretch-gated ion channel D. pump protein
The upstream activator sequence for the GAL genes (UASGAL) is recognized by:
A. Gal80p. B. Gal3p. C. Mig1. D. Gal4p.
Which of the following best describes the structure of DNA?
A. single helix B. protein coil C. double helix D. globular RNA
In which organelle of the plant does photosynthesis takes place?
A. thylakoid membrane B. chloroplast C. grana D. mesophyll E. mitochondria