The lateral movement of transmembrane proteins can be restricted by several different mechanisms. Which mechanism best describes the process by which an antigen-presenting cell triggers an adaptive immune response?
(a) proteins are tethered to the cell cortex
(b) proteins are tethered to the extracellular matrix
(c) proteins are tethered to the proteins on the surface of another cell
(d) protein movement is limited by the presence of a diffusion barrier
(c)
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How many water molecules would be produced in making a polypeptide that is 14 amino acids long?
A. 0 B. 13 C. 14 D. 28
In HIV, RNA is transcribed to DNA by:
A. matrix. B. reverse transcriptase. C. surface glycoprotein. D. capsid. E. integrase.
Individuals with PKU tend to have high levels of _______ in their blood because they have an inactive variant of an _______.
A: phenylpyruvic acid; enzyme B: hemoglobin; oxygen transport protein C: tyrosine; enzyme D: phenylpyruvic acid; oxygen transport protein E: tyrosine; oxygen transport protein
The direction of synaptic transmission from the neocortex through the entorhinal cortex and to the hippocampus is
A. a negative feedback loop B. directional and linear C. reciprocal and multi-linear D. parallel and serial E. branched and looping