If DNA is like an instruction manual, what would be similar to the typographical errors that may result when the DNA manual is transcribed?
A) dominant alleles
B) recessive alleles
C) mutations
D) homologous chromosomes
C
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The study of the occurrence, distribution, and determinants of health and disease in a population is the field of
A) microbiology. B) immunology. C) epidemiology. D) virology.
. A research strain of mice has a mutation that causes voltage-gated sodium channels to take longer to return to the active state after a spike. What is the likely consequence for transduction of sensory stimuli?
A. There will be no effect on sensory perception, because sensory information relies on stimulus-gated ion channels and not voltage-gated ion channels. B. Sensory information will be incorrectly perceived as high intensity stimuli, due to the increased frequency of action potentials. C. The mutation will interfere with the ability of stimuli to create receptor potentials, and thus the neuron will fire with slow, broad action potentials, giving the animal enhanced sensory perception. D. Due to a longer refractory period, the neuron will be unable to conduct high frequency action potentials, and thus will not effectively transmit information about strong stimuli. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about action potentials? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The general term for disorder associated with decreased oxygen delivery by blood is ____
a. malaria b. leukemia c. mononucleosis d. anemia e. toxemia
Albumin is the large protein molecule found in egg white and blood plasma. Table salt dissociates into sodium and chloride ions. Urea is assembled in the liver. In a healthy person, what is the fate of the majority of these molecules as they pass through a nephron?
A. Albumin remains in the blood, salt ions move into the filtrate but most are reabsorbed, and the urea moves into the filtrate and is excreted in the urine. B. Albumin remains in the blood and salt ions and urea moved into the glomerular filtrate and excreted in the urine. C. All three move into the glomerular capsule but the salt ions are mostly reabsorbed. D. All three remain in the bloodstream. E. All three move into the glomerular capsule and are excreted in urine.