A set of local communities that are linked by the dispersal of multiple, potentially interacting species is referred to as a(n)
A) ecotone.
B) archipelago.
C) metapopulation.
D) metacommunity.
D
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In female humans and other mammals, dosage compensation is achieved by the inactivation of one of the two X chromosomes in each cell. Which one of the following does not occur in the X-inactivation mechanism of female mammals?
A. X-inactivation begins with a small region of the X chromosome that contains a gene for an X-inactivation specific transcript (Xist). B. Xist is expressed in low levels except when an X chromosome is about to be inactivated. C. When an X chromosome is about to be inactivated, Xist RNA transcripts increase markedly and undergo splicing, but do not encode a protein. D. Xist RNA is attracted to and associates with a protein called the X-chromosome inactivation center (XIC), which becomes entirely coated with Xist. E. Xist RNA recruits factors that promote DNA methylation, histone modification, and other changes associated with transcriptional silencing.
Which of the following is not classified as a herbaceous plant?
a. cacti b. corn c. fern d. lady slipper
What is the underlying molecular cause of Crohn’s disease?
a. B cells are mutated and do not release antibodies. b. Receptor proteins are mutated and cause an abnormal immune response. c. Helper T cells are inactivated. d. Mucus is not released from epithelial tissues. e. Antigen-presenting cells are absent.
Identify a true statement about alpha-adrenergic blocking drugs.
What will be an ideal response?