Which of the following statements is a valid conclusion of this experiment?
A) Balanus can survive only in the lower intertidal zone because it is unable to resist desiccation.
B) Balanus is inferior to Chthamalus in competing for space on rocks lower in the intertidal zone.
C) The two species of barnacles do not compete with each other because they feed at different times of day.
D) The removal of Balanus shows that the realized niche of Chthamalus is smaller than its fundamental niche.
E) These two species of barnacle do not show competitive exclusion.
F) If Chthamalus were removed, Balanus's fundamental niche would become larger.
Answer: D
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X chromosome inactivation is caused by the accumulation of:
A. proteins produced by the Xist gene; these proteins induce methylation, histone modification, and other changes associated with preventing transcription. B. coding RNA produced by the Xist gene; this RNA, in addition to coding for Xist proteins, binds to and coats the X chromosome undergoing inactivation and physically prevents it from being transcribed. C. non-coding RNA produced by the Xist gene, which coats the X chromosome and physically prevents it from being unwound, "unzipped," and transcribed. D. non-coding RNA produced by the Xist gene, which coats the X chromosome and induces methylation, histone modification, and other changes associated with preventing transcription. E. None of these choices accurately describe the process of X chromosome inactivation.
If the number of people who become ill during an epidemic rises and falls rapidly, this is called a(n)
A. propagated epidemic. B. promulgated epidemic. C. common source epidemic. D. index epidemic.
An inorganic compound is one that contains carbon
__________________ Indicate whether the statement is true or false.
When macrophages send out chemical messages to the brain to warn of microbial invasion, the brain often responds by producing a ________.
Fill in the blank(s) with the appropriate word(s).