The spread of pathogens via contaminated water is an example of which type of transmission?
A) indirect contact
B) direct contact
C) vehicle
D) vector
Ans: C) vehicle
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Gene therapy requires _____
A) knowledge and availability of the normal allele of the defective gene B) the ability to introduce the normal allele into the patient C) the ability to express the introduced gene at the correct level, time, and tissue site within the patient D) knowledge and availability of the normal allele of the defective gene and the ability to introduce the allele into the patient E) knowledge and availability of the normal allele of the defective gene, an ability to introduce the normal allele into the patient, and an ability to express the introduced gene at the correct level, and time, and tissue site within the patient
What stops the rapid depolarization that occurs as the "upsweep" of membrane potential peaks during the action potential?
A. Closing of the voltage-gated Na+ channel activation gate. B. Closing of the voltage-gated Na+ channel inactivation gate. C. Opening of the voltage-gated K+ channel gate. D. Both opening of the K+ channel gate and closing of the Na+ channel inactivation gate. E. Both opening of the K+ channel gate and closing of the Na+ channel activation gate.
You are using genetic engineering to design a protein that needs to be synthesized in the cytoplasm and then localized in the nucleus of the cell. To accomplish this, one could add
A) a nuclear localization signal into the DNA that will be present in the mature protein. B) the compound during mitosis, at a time when the nuclear membrane is dispersed. C) a nucleotide or few nucleotides to the protein. D) a series of specific polysaccharides to the carboxyterminal end of the protein. E) all of the above
A(n) ________ is like an underwater geyser where hot mineral-rich water streams out of an opening in the rocky bottom
a. meteorite b. volcano c. atoll d. hydrothermal vent e. crevice