Epinephrine raises blood pressure by ____
a. increasing the strength and rate of the heartbeat
b. decreasing the strength and rate of the heartbeat
c. stimulating vasodilation
d. reducing vasodilation
e. decreasing blood flow to the heart, skeletal muscles, and lungs
ANSWER: a
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Although miRNAs and siRNAs share many similarities, including their incorporation into the RISC complex,
they differ in that with siRNA the single-stranded sequence that binds to targeted mRNAs results in cleavage of the mRNA and more rapid degradation by nucleases. A. true B. false
Answer the following statements true (T) or false (F)
1. Plasmids can help bacteria grow faster. 2. The ability to transfer DNA via conjugation is a universal feature of E. coli strains. 3. Transformation is the transfer of genes from dead bacteria to live bacteria. 4. It has been difficult to create an effective vaccine against HIV because reverse transcriptase cannot correct its errors. 5. Viral genomes must always be excised from the bacterial chromosome before viral components can be produced.
In the diagram of a root tip shown above, the item labeled "2" is the
a. quiescent center. b. zone of cell division. c. zone of elongation. d. root cap. e. zone of maturation.
The processing of information and response in a manner that suggests thinking in the animal is called
A. endogenous behavior. B. environmental induced behavior. C. instinctive behavior. D. associative behavior. E. cognitive behavior.