Restriction enzymes cut double-stranded DNA
at a specific base sequence
a. between genes.
b. and produce fragments of four to eight base
pairs in length.
c. between bacterial and viral DNAs.
d. between purines and pyrimidines.
e. between promoter and operator DNA
sequences.
B
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Gene expression involves two phases, ___________ and translation.
A. replication B. transcription C. initiation D. condensation
In what order do the following taxa appear in the fossil record?
a. invertebrates; fish; land plants; amphibians b. invertebrates; amphibians; fish; land plants c. land plants; invertebrates; amphibians; fish d. land plants; invertebrates; fish; amphibians e. invertebrates; fish; amphibians; land plants
What experimental evidence suggests that the N-terminal tails of histones participate in the formation of higher-order chromatin structure?
a) The tails cause histones to denature. b) Chromatin fibers prepared with H4 histones lacking their tails cannot fold into higher-order fibers. c) Chromatin fibers prepared with H4 histones possessing longer tails cannot fold into higher-order fibers. d) The tails when acetylated cause the dissolution of the 30-nm fibers. e) Chromatin fibers lacking tails are shorter.
What 3 cell structures are only in eukaryotic cells?
What will be an ideal response?