During stressful situations, epinephrine initiates all of the following actions EXCEPT
a. constriction of blood vessels to the skin.
b. constriction of blood vessels to the heart.
c. dilation of blood vessels to the brain.
d. an increase in metabolic rate.
e. an increase in blood glucose levels.
B
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Who performed classic experiments that supported the semiconservative model of DNA replication?
A) Watson and Crick B) Meselson and Stahl C) Hershey and Chase D) Franklin and Wilkins
A mature collection of species, called a ____ ____ , makes up the final stage of succession
Fill in the blank with the appropriate word.
The release of chemicals from injured cells triggers histamine release from
A) macrophages. B) B cells. C) neutrophils. D) phagocytes. E) mast cells.
Shown below is a diagram for a plasmid vector you want to use to clone a gene. The diagram shows the location of the recognition sites for four restrictions enzymes, BamHI (B), EcoRI (E), HindIII (H), and XhoI (X). The genes encoding beta-lactamase (AmpR) and beta-galactosidase (lacZ) are indicated. If you were to use this vector, which enzyme should be used to linearize the plasmid in preparation for cloning?
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A. XhoI B. EcoRI C. BamHI D. HindIII E. EcoRI and XhoI