The binding of a regulatory transcription factor to a(n) _________ can stimulate transcription 10- to 1000- fold, which is called _______________ regulation
Fill in the blank(s) with the appropriate word(s).
Ans: regulatory element; up
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Why do adult urochordates (tunicates) lack notochords, even though larval urochordates have them? Larvae use notochords to _____
A) aid in swimming; adults are sessile and thus no longer propel themselves. B) stiffen their bodies; in adults, the notochord is replaced by a column of bone. C) induce tissue differentiation; in adults, tissue is already differentiated. D) organize their nervous systems; adults' nervous systems are fully developed and do not change.
Nitrogen fixation:
A. is necessary for the electron-transport chain because nitrogen acts as the final electron acceptor. B. incorporates molecular nitrogen (N2) taken from the air into amino acids and nucleotides. C. releases N2 gas to the atmosphere. D. converts N2 to ammonia, making it available for incorporation into amino acids and nucleotides. E. is carried out by biochemical pathways in the plant cells.
When the results of a GWAS experiment using 500,000 SNPs are plotted in a Manhattan plot, significantly associated SNPs are
A) data points with a ?log (p value) less than 0.05. B) data points with a ?log (p value) greater than 7. C) data points with a ?log (p value) greater than 7 that fall within a known coding sequence. D) any data points above the line of correlation.
Programmed cell death occurs ________________
(a) by means of an intracellular suicide program. (b) rarely and selectively only during animal development. (c) only in unhealthy or abnormal cells. (d) only during embryonic development.