Calcium ions are normally in higher concentrations outside most living cells than within cells. Which of the following processes is most likely responsible for this condition?
A) active transport B) facilitated diffusion
C) osmosis D) simple diffusion
Answer: A
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Bergey's Manual of Systematic Bacteriology contains
A) classification schemes for prokaryotes. B) treatments for bacterial diseases. C) a complete list of all bacterial species. D) genetic sequences of all known prokaryotes. E) rules for naming new bacterial species.
Which receptors are associated with the sense of equilibrium?
A. mechanoreceptors B. thermoreceptors C. chemoreceptors D. nociceptors E. photoreceptors
A patient in his forties is diagnosed with Huntington disease. The patient's mother is healthy and a genetic evaluation shows 25 and 26 CAG repeats within her HTT alleles
The patient's father died at age 24 when the patient was 2 and no genetic evaluation can be done. It is most likely that: A. the father was heterozygous for the defective HTT allele. B. the father was homozygous for the defective HTT allele. C. the mother is a carrier for the defective HTT allele. D. the HTT gene acquired additional CAG repeats during the 40 years of the patient's life.
Which component of a negative feedback mechanism does the brain or spinal cord represent?
a. response b. sensor c. integrator d. effector e. stimulus