When a DNA promoter sequence is methylated,
a. it is permanently silenced because the methyl group can never be removed.
b. it is temporarily silenced because the methyl group can be removed.
c. it is perpetually transcribed because the methyl group can never be removed.
d. it is temporarily transcribed because the methyl group can be removed.
e. the impact on expression is dependent on and specific to a particular gene.
B
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Members of the class _______, which include octopuses, squids, and nautiluses, are highly intelligent.
Fill in the blank(s) with the appropriate word(s).
Which of the following male organisms do. NOT contain XY chromosomes?
a. mice b. fruit flies c. horses d. pigs e. moths
The property on which the acid-fast stain depends is:
a) affinity for basic dyes b) capability for reducing silver c) failure to stain with a dye other than basic fuchsin d) ability to resist decolorization with dilute acids
The firefly (Photinus†granulatus) and the zebra mussel (Dreissena†polymorpha) are both members of the kingdom Animalia. This indicates that they must also both be members of the same
A. phylum B. genus C. species D. order E. domain