Typically, methylation of nucleosome N-terminal tails leads to __________
A) removal of the protein components of the chromatin from the DNA
B) relaxed packaging of the chromatin and increased transcription
C) tighter packaging of the chromatin and reduced transcription
D) increased amounts of euchromatin relative to heterochromatin
E) activation of topoisomerase
C
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When the replication machinery encounters a single-strand break, the replication fork collapses resulting in a double-strand break. Which of the following would be the fourth step in repairing this damage?
A. The 3' single-strand overhang invades the intact portion of the chromosome, pairs with its complementary strand, and displaces the other. B. Once the strand invasion is complete, branched migration occurs. C. The broken ends are processed, with the 5' ending strand selectively degraded to create 3' overhangs. D. Branch migration creates Holliday intermediates that are resolved by the enzyme resolvase. E. Resolution of the Holliday intermediate is followed by ligation and replication is restarted.
Sulfate and sulfite reductions carried out by Desulfovibrio and related microorganisms are assimilatory processes.
Answer the following statement true (T) or false (F)
Uterine contractions are most likely an example of
a. a unique human reproductive phenomena. b. negative feedback. c. positive feedback. d. programmed events. e. positive feedback and programmed events.
Diffusion of morphogens—products of master
genes—creates gradients that cause the differential expression of other genes such as __________, which govern the formation of specific body parts. Fill in the blank(s) with the appropriate word(s).