The typical number of chromosomes in a human diploid cell is ____
a. 12
b. 23
c. 46
d. 69
e. 92
ANSWER: c
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Three disadvantages of utilizing microarrays for transcriptome analysis are that microarrays (select all correct choices):
A. require large quantities of RNA to hybridize and thus show a positive signal. B. show high levels of nonspecific (background) hybridization. C. may not have DNA to which specific RNAs will hybridize. D. will not allow comparison of transcription between cell types. E. do not accurately report transcriptional levels of specific mRNAS. F. are not able to detect and evaluate rare allele variant transcripts.
Martha Chase and Alfred Hershey conducted experiments to identify the genetic material used by bacteriophages to reproduce inside bacteria. As part of their procedure, they successfully isolated these viruses from the bacteria they infected. Why is this same procedure not used to remove viruses from living tissues?
a. Bacteria have capsules that make them buoyant in solution. b. The phages were specifically chosen for ease of filtration. c. Most tissues fare poorly when blended and centrifuged. d. The sorting process requires injecting radioactive dyes.
An ex-smoker with emphysema has a pulmonary erosion into his intrapleural space. What life-threatening condition is he at imminent risk of developing?
A) bacterial pneumonia B) pulmonary fibrosis C) pneumothorax (air leaking into the intrapleural space) D) adhesions to the parietal pleura E) acute respiratory distress syndrome (ARDS)
Watching salt crystals form as ocean water evaporates, a student says, "Lookâmore and more crystals are appearing. The ocean water is alive!" Which statement is an accurate evaluation of the student's remark?
A) The student is correct: Crystals are ordered structures and they are reproducing, so the ocean water is alive. B) The student is correct because crystals are formed by processing energy from the sun to create new structures, so ocean water is alive. C) The student is incorrect because the solution is processing energy from the sun rather than gaining energy from other organisms, so the ocean water is not alive. D) The student is incorrect because all of the crystals reproduce the same kind of crystals with no variation to provide adaptation, so the ocean water is not alive.