When a protein must be exported outside the cell, it is synthesized in ribosomes bound to the _______. Then it is modified and packaged into a _______.
What will be an ideal response?
rough endoplasmic reticulum; transport vesicle
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When potassium ion channels open, which of the following occurs?
a. potassium ions flow into the axon cytoplasm b. the axon cytoplasm becomes more negatively charged c. sodium ions diffuse into the axon cytoplasm d. the threshold potential is reached e. more sodium channels open
Crossing a zebra with a horse produces sterile offspring. This is an example of
A) temporal isolation. B) hybrid inviability. C) hybrid infertility. D) hybrid vigor. E) gametic incompatibility.
An elevated IgM titer typically indicates an active infection while an elevated IgG titer does not distinguish between active and past infections.
Answer the following statement true (T) or false (F)
Phenolics act on microbes by
A) Dissolving membrane lipids B) Denaturing proteins and disrupting cell membranes C) Oxidizing cellular constituents D) Precipitate cell proteins