Which sequences would likely have both a nucleosome-depleted region (NDR) and a poly A/T tract to attract transcriptional activators to a transcription start sequence?
A) chromatin modifiers
B) enhancers
C) open promoters
D) closed promoters
E) insulators
C
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The site on an enzyme that will bind the substrate is called the
A) prosthetic group. B) catalyst. C) active site. D) metastable site. E) activation site.
The nitrogenous base that is in RNA but not in DNA is
A) thymine. B) thiamine. C) uracil. D) urea.
Menstruation begins immediately after the follicular phase
Indicate whether the statement is true or false.
Gause's principle of competitive exclusion is based on the idea that ____
a. larger organisms exclude smaller ones through competition as in the case of large trees controlling underbrush b. competition for the same resources excludes species having different life styles. c. no two species can occupy the same niche indefinitely when resources are limited d. two species can coexist if their niches do not overlap e. species survival depends upon coevoloution