________ is a condition in which the heart rate is slower than normal.
A) Cardiac arrhythmia
B) Bradycardia
C) Tetanus
D) Summation
E) Tachycardia
B) Bradycardia
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You're researching a steroid hormone that binds to a receptor inside the cell. Once the receptor binds to its hormone, the receptor moves into the nucleus of the cell. The result of hormone-receptor binding is that new mRNA molecules are made. The receptor is also a
A. splicosome. B. ribosome. C. tRNA molecule. D. promoter. E. transcription factor.
Which of the following transport processes requires cell energy?
a. osmosis b. dialysis c. pinocytosis d. both A and B above
Which of the following statements is true of metaphase I of meiosis I?
A) Joined homologous pair uniformly line up on the equatorial spindle with chromosome one at the top and chromosome 23 on the bottom. B) Tetrads align randomly on the spindle equator with all the maternal homologs on one side and all the paternal homologs on the opposite side. C) Homologous pairs align randomly on the spindle equator with a mix of paternal and maternal homologs destined for each of the daughter cells. D) The sister chromatids line up randomly on the spindle equator with some maternal and paternal chromatids on both sides of the equator.
If a stimulating electrode is placed in the middle of a resting axon and an above-threshold voltage is applied to the electrode action potentials
A) will start at that point and travel in both directions in the axon. B) will start at that point and proceed only toward the axon terminal. C) will not occur. D) will start at that point and proceed only toward the cell body.