The stage of viral replication in which the virus binds a cell surface receptor is:
a. Release
b. Penetration
c. Synthesis
d. Attachment
e. Assembly
d. Attachment
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Environmental air temperature can fluctuate many degrees during the course of a day. A human's body temperature
A. can also fluctuate many degrees. B. must be maintained within a range of a few degrees. C. is raised by sweating and dilation of blood vessels in the skin. D. is not maintained internally but fluctuates with the air temperature. E. is lowered by shivering.
If offspring exhibit a 9:3:3:1 phenotypic ratio, what are the genotypes of the parental (p) generation? _______________
Fill in the blank(s) with the appropriate word(s).
Experience with dog breeding has taught geneticists ________
A) that, given enough time, any desired trait can be bred into dogs B) that purebred dogs have offspring with qualities identical to the parents, because all purebred dogs are alike genetically C) that, while physical traits can be molded through artificial selection, behavioral traits cannot D) that geographically isolated groups of dogs may be selected for quite different traits, resulting in a different dog breed
A freshwater fish would be expected to __________.
a. pump salt out through salt glands in the gills b. produce copious quantities of dilute urine c. excrete urea across the epithelium of the gills d. have scales that reduce water loss