Fats will dissolve in ethanol. Ethanol is an example of a ____
a. solute
b. solution
c. solvent
d. salt
e. ion
ANSWER: c
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Pre-mRNA splice sites are recognized by the spliceosome through:
A. base pairing with snRNAs. B. site-specific recognition by the Sm proteins. C. RNA hairpin recognition. D. the specific distance of the intron from the mRNA 5' cap.
In Addam's family, there is an autosomal dominant condition in which webbing attaches the second toe to the third toe and the second toe is longer than the big toe. Only some of the members who have inherited the mutant allele have a second toe longer than the big toe. In addition, the extent of webbing varies. This phenotype is
A) both inherited and non-inherited. B) dominant and recessive. C) variably expressive and incompletely penetrant. D) invariably expressive and completely penetrant.
Deforestation:a
retards soil erosion. b. releases carbon dioxide that may contribute to global warming. c. has no effect on the extinction of biological species. d. promotes the preservation of tropical birds. e. is only a threat to tropical rain forests.
Which stage of animal virus replication may be blocked by a drug that binds with the viral spike?
A) assembly B) attachment C) replication D) penetration E) uncoating