The intentional injection of an attenuated virus into a person will lead to
A. Artificially acquired passive immunity
B. Naturally acquired passive immunity
C. Naturally acquired active immunity
D. Eventual disease
E. Artificially acquired active immunity
Answer: E. Artificially acquired active immunity
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Which of the following statements about marine bony fish is false?
A. Chloride cells in the gills actively pump chloride ions into the body. B. They maintain a body fluid solute concentration that is lower than that of the surrounding seawater. C. They drink water to replenish water supplies. D. They are osmoregulators. E. They tend to lose water through osmosis.
Suppose you have engineered a plasmid vector in order to produce a functional animal protein in E. coli. But the product you collect, while it has the correct amino acid sequence, is in fact nonfunctional
What might you try that would have a greater chance of success? A) a eukaryotic expression vector that has sequences for regulating transcription B) using a host other than E. coli that does not have the same codon bias C) a eukaryotic expression vector that includes sequences for controlling posttranslational effects D) treatment of the posttranslation proteins to add signal sequences E) using yeast artificial chromosomes that can hold longer sequences
The ancient earth did not contain much oxygen
a. true b. false
The ascending limb of the loop of Henle
A. removes solutes from the filtrate. B. is permeable to sodium ions. C. is not permeable to water. D. produces hypoosmotic filtrate. E. has all of these properties.