A technique used to quantify specific types of microbes in natural samples, enrichment cultures, and food or water samples is known as the ________ technique.
Fill in the blank(s) with the appropriate word(s).
most probable number
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Intercalated discs are cell-cell junctions found between cardiac muscle cells. One feature of these intercalated discs is that they contain a large number of gap junctions, which means that _____
A) an extension of smooth endoplasmic reticulum goes through the gap junction, making it continuous from one cardiac muscle cell to the next B) water ions and small molecules can readily pass from one cardiac muscle cell to the next C) cardiac cells can function independently when necessary D) RNA from one cardiac muscle cell can be transported into an adjacent cell through the gap junction
Given the B cell's role in the adaptive immune response, it is reasonable to assume that a B cell will have:
A. a large number of pseudopods. B. extensive rough endoplasmic reticulum. C. an enlarged nucleus. D. All of the answer options are correct.
Substance C is secreted from a neuron, and binds to its receptor on a nearby cell, triggering an increase in intracellular
cAMP. Substance C is therefore a ligand for a ____.
a. a receptor tyrosine kinase b. a G-protein-coupled receptor c. a hormone receptor d. a ligand-gated ion channel e. guanylyl cyclase
During fermentation, what type of molecule is used to regenerate NAD+ from NADH?
a. an inorganic molecule b. oxygen c. an organic molecule d. water