In situations where signaling pathway components need to be "fixed" in a particular position within the cell (e.g., in the yeast mating pathway), they are associated with ________.
Fill in the blank(s) with the appropriate word(s).
scaffolding proteins
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After growth in tissue culture, the infected cells lyse and the virus may be harvested from
A. the lysate, the liquid supernatant after centrifugation. B. the remainder. C. the quantal layer. D. the monolayer.
Passive immunity can provide immunity ____
a. temporarily b. permanently
c. for months d. for many years e. for an entire lifetime
What is one of the advantages of producing human growth hormone (HGH) from a cloned gene in a bacterial cell?
A) As the protein is introduced therapeutically, it transfers the HGH gene as well. B) Larger quantities are available. C) The bacterial protein has a different amino acid sequence that is more effective. D) The product can be administered by infecting a person with the recombinant bacteria. E) A gene cloned from mice, rather than from humans, can be used.
Fick's law of diffusion states that the rate of diffusion of a gas across a membrane depends on all of the following except
A. the size of the gas molecule. B. the membrane surface area. C. which membrane transport proteins are present. D. the width of the membrane. E. the concentration difference of the gas on the two sides of the membrane.