________________ neurons detect stimuli such as light or touch.
Fill in the blank(s) with the appropriate word(s).
Sensory
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The T cell, with its T cell receptor, can recognize antigens only when the antigens are complexed with self proteins known as major histocompatibility complex found on host cell surfaces
Indicate whether the statement is true or false.
Proteins can assemble to form large complexes that work coordinately, like moving parts inside a single machine
Which of the following steps in modulating the activity of a complex protein machine is least likely to be directly affected by ATP or GTP hydrolysis? (a) translation of protein components (b) conformational change of protein components (c) complex assembly (d) complex disassembly
Why are nucleoside analogs active only against replicating viruses?
A. These drugs can only be taken up by cells that are infected by viruses. They are shut out from non-infected cells. This makes them effective only against cells where viruses are replicating. B. Each of these drugs is specifically activated by enzymes produced by the viruses. The viruses will only produce these enzymes when they are replicating, so the drugs can only become activated when these processes are occurring. C. Nucleoside analogs work by directly inhibiting the activity of nucleic acid polymerases. If the virus isn't actively replicating, there's no DNA/RNA polymerase active for the drug to inhibit, so the drug cannot work. D. Nucleoside analogs work by being incorporated into growing strands of DNA/RNA. This indirectly shuts down further extension of these chains. However, new strands of viral DNA/RNA are only being created when the virus is replicating. As such, these drugs can only work when the virus is actively replicating as well.
After reaching the inner ear, the frequency of a sound primarily affects
A. the amplitude of basilar membrane vibration. B. the location of the greatest basilar membrane vibration. C. the vibrational amplitude of the tectorial membrane.