You find some rather strange plants in your backyard. They consist only of thin, pale yellow stems that are wrapped around other species of plants growing nearby. You experiment by unwrapping some of the strange yellow plants and planting half of them alone in pots of soil and half in pots with other plants from your yard. You water and fertilize both sets of pots, but after a few weeks you find that the yellow plants that were potted alone have died, while those potted with other plants are thriving. What term would you use to describe the strange yellow plants?
A. holoparasitic
B. asexual
C. monophagous
D. aposematic
E. hemiparasitic
Answer: A
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It is notoriously difficult to perform unbiased studies when human subjects are used. When governmental agencies such as the U.S. Food and Drug Administration (FDA) are trying to determine the validity of scientific claims, they very closely examine the
methods used in the experiments. What are the three phases of clinical trial, and which one(s) must a drug pass in order to be sold in U.S. markets? What will be an ideal response?
A 45-year-old man has pus-filled vesicles distributed over his back in the upper right quadrant, over his right shoulder, and upper right quadrant of his chest. His symptoms are most likely due to
A) Candida albicans. B) herpes simplex virus. C) Staphylococcus aureus. D) Streptococcus pyogenes. E) varicella-zoster virus.
During the investigation of a convenience store robbery, witnesses report that the perpetrator exited through a main entry door without wearing gloves. The police are holding a prime suspect in custody while samples from the door are collected and analyzed for a DNA match. Since the door was handled by many people before the robbery, how will the forensics department distinguish the suspect's DNA from the DNA of others using PCR?
A. Since multiple people touched the doorknob without gloves, it is impossible to use PCR to distinguish the suspect's DNA. B. PCR will be used to make sequence-specific primers that are complementary to the suspect's DNA. C. Sequence-specific primers to the suspect's DNA will be added following PCR amplification. D. Sequence-specific primers to the suspect's DNA will be used for PCR amplification.