During fertilization in humans, sperm reach the egg by traveling through the vagina, uterus, and fallopian tubes. In which body cavity does the sperm locate the egg ?
A. pleural cavity
B. abdominal cavity
C. pelvic cavity
D. dorsal body cavity (cerebral-spinal)
E. pericardial cavity
Answer: C
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After an oil spill, bacteria that can metabolize hydrocarbons are released for bioremediation. After a month, two areas affected by the spill show different levels of improvement. What factor should be measured to determine the difference in effectiveness between the two sites?
A. Temperature B. Oxygen levels C. pH D. Salinity E. Nutrient levels F. All of these factors may play a role. 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 bioremediation? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Why is the fossil record not a complete catalog of biological history?
A. Not all organisms fossilize with equal probability. B. Fossilization destroys the structure of DNA. C. The process of fossilization often destroys anatomical features of the organisms being preserved. D. Fossils only preserve organisms for about 10 million years; older organisms are destroyed by geological processes. E. Only animals, not plants, are fossilized.
In order to study a cell at lower temperatures, a researcher must artificially increase its membrane fluidity. What would be a reasonable strategy for increasing plasma membrane fluidity at low temperatures?
A. decrease the composition of cholesterol in the plasma membrane B. increase the composition of phospholipids with saturated fatty acid chains C. decrease the composition of phospholipids with unsaturated fatty acid chains D. decrease the length of the phospholipid fatty acyl tail. E. All of the above strategies are reasonable
Which of the following statements about nosocomial infections is not true?
A) They occur in compromised patients. B) They are caused by opportunists. C) They are caused by drug-resistant bacteria. D) They are caused by normal microbiota. E) None of the above.