The most dangerous arrhythmia is ____
a. bradycardia
b. heart failure
c. tachycardia
d. atrial fibrillation
e. ventricular fibrillation
ANSWER: e
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When crossover occurs, the result is:
A. 4 chromosomes, all nonrecombinant. B. 4 chromosomes: 3 nonrecombinant and 1 recombinant. C. 4 chromosomes: 2 nonrecombinant and 2 recombinant. D. 4 chromosomes: 1 nonrecombinant and 3 recombinant. E. 4 chromosomes, all recombinant.
Briefly describe how the experiments performed by Frederick Griffith provided evidence of DNA as the genetic material
What will be an ideal response?
You are having lunch with an elderly friend when suddenly he begins to experience chest pain and tightness. He reaches into his pocket, gets out one of his nitroglycerin tablets and quickly takes it. After the episode passes, your friend asks you how the nitroglycerin helps his angina. You explain that nitroglycerin gets converted by cells to nitric oxide (NO) causing the smooth muscle cells of the blood vessel to relax and increase blood flow to the heart. He pushes you for a more detailed explanation, so you explain further that:
A. NO activates a protein kinase which catalyzes the synthesis of cGMP, which acts as an intracellular messenger in a pathway leading to smooth muscle relaxation. B. NO activates guanylyl cyclase, which catalyzes the synthesis of cGMP, which acts as an intracellular messenger in a pathway leading to smooth muscle relaxation. C. NO inhibits guanylyl cyclase, which allows the build up of cGMP, which acts as an intracellular messenger in a pathway leading to smooth muscle relaxation. D. NO activates cGMP, which catalyzes the synthesis of guanylyl cyclase, which acts as an intracellular messenger in a pathway leading to smooth muscle relaxation.
A population carries two alleles for a trait in which T is dominant and t is recessive. In the Hardy-Weinberg equation, p2 represents the
A) proportion of homozygous dominant individuals. B) decrease in heterozygous individuals. C) proportion of homozygous recessive individuals. D) increase in homozygous individuals. E) proportion of heterozygous individuals.