Because genetic information is stored as a linear sequence of bases in DNA, any change in the order or number of
bases in a gene can result in a(n) ____________________ that produces an altered ____________________. Fill in the blank(s) with the appropriate word(s).
mutation; pheno
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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.
A marine biologist visits your biology class and begins his talk entitled, "Life as a Trochophore." A friend seated next to you asks, "What is a trochophore?" You explain that a trochophore is
A. another name for the veliger stage in earthworm reproduction. B. a term used to describe a larval form of either the phylum Mollusca or Annelida. C. another name for the veliger stage in the oyster. D. similar to a lophophore, but only found in the phylum Annelida. E. a parasite in the intestines of a bivalve mollusk.
ATP is a portable form of energy "currency" inside cells.
a. true b. false
Put the steps in the correct order for a birder hearing the call of a whip-poor-will.____ Bird sings "whip-poor-will"____ Sound waves travel to the birder's pinna and enter the canal____ Oval window vibrates____ Basilar membrane vibrates in different regions for each note____ Malleus, incus, and stapes vibrate____ Tympanic membrane vibrates____ Auditory cortex interprets the pattern____ Pressure waves travel through fluid in the cochlea____ Action potentials travel down axons that represent different frequencies____ Cilia of hair cells bend in different regions for each note
What will be an ideal response?