A large sample size decreases the likelihood that an experimental result will be significant.
a. true
b. false
b. false
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Which of the following is true of both neurotransmitters and hormones?
A. They are both involved in paracrine signaling. B. They both interact with receptors inside or on the surface of target cells. C. They are both produced in glands. D. They both travel through the bloodstream to target cells. E. They both influence the activity of multiple organs simultaneously.
Mutations in the DFNA20/26 locus, which codes for the actin gamma 1 protein, are associated with congenital deafness. An irate senator complains that government money is being wasted on studies of this mutant gene -- in yeast! "I am no biologist," says the senator, "but I am pretty sure yeast don't have ears." How do you respond?
A. "You are right, Senator -- yeast do not have ears. We should revoke the funding immediately." B. "We can learn valuable information about the structure of the mutant protein by expressing it in yeast. It is difficult to collect large amounts of actin from tiny hair cells, and unethical to collect it from human patients." C. "We can learn valuable information about the transcription of the mutant gene in yeast. It is much more difficult to study transcription in human cells." D. "We can learn valuable information about sound transmission through the mutant yeast. By placing a speaker against a yeast vial and recording sound from the other side, we can infer how the mutant actin affects sound waves." 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 mutant genes? 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?
If x and y have a positive relationship as shown by a scatter plot, then the value of y will
A) increase as the value of x decreases. B) increase as the value of x increases. C) decrease as the value of x increases. D) stay the same as the value of x decreases.
Answer the following questions true (T) or false (F)
1. Humans are the only hosts of Rickettsia rickettsii. 2. Because they are common soil saprobes, dermatophytes are fungi that are not contagious in humans. 3. Chromoblastomycosis is rarely a severe disease and can be treated easily with appropriate drugs.