Atmospheric pressure at sea level is equal to a column of 760 mm Hg. Oxygen makes up 21 percent of the atmosphere by volume. The partial pressure of oxygen ( ) in such conditions is _____
A) 160 mm Hg
B) 16 mm Hg
C) 21/760
D) 760/21
A
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Which of the following is the meaning of the chromosome theory of inheritance as expressed in the early twentieth century?
A) Individuals inherit particular chromosomes attached to genes. B) Mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis. C) Homologous chromosomes give rise to some genes and crossover chromosomes to other genes. D) No more than a single pair of chromosomes can be found in a healthy normal cell. E) Natural selection acts on certain chromosome arrays rather than on genes.
Which of the following are not present in plant cells?
a. endoplasmic reticulum b. Golgi complex c. lysosomes d. mitochondria
An organism that maintains a constant body temperature is termed:
a. an endotherm. b. an ectotherm. c. a poikiotherm. d. cold blooded. e. an osmoconformer.
Jim is suffering from congestive heart failure, in which blood flow is backed up in his lungs and excess fluid is escaping the blood and accumulating in his lung tissue. If untreated, increasing pulmonary edema will lead to death by suffocation. What is the most-likely cause of Jim’s congestive heart failure?
A. Contraction of his right atrium is not keeping up with contraction of his left atrium. B. Contraction of his left ventricle is not keeping up with contraction of his right ventricle. C. Jim’s pulmonary semilunar valve is not opening properly. D. Jim’s SA node is malfunctioning. E. Jim’s right atrioventricular valve (tricuspid valve) is not closing properly. Gather Content What do you already know about the path of blood between the heart and the lungs? 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?