Scientists develop a chemical that binds to molecules that make quorum sensing possible, rendering those molecules non-functional. If this chemical is incorporated into a mouthwash, how would it affect the community of bacteria that cause dental plaque?
A. Their negative effects would be increased because it will cause them to produce mucilage, allowing them to stick to teeth.
B. It would have no effect because they will still be able to form a biofilm and secrete the acid that damages teeth.
C. Their negative effects would be reduced because they will no longer be able to produce mucilage and stick to teeth.
D. Their negative effects would be reduced because they will no longer be able to produce the acid that damages teeth.
E. Their negative effects would be increased because it will cause them to produce the acid that damages teeth.
Answer: C
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In a population of 100 four-o'clock flowers there are 40 red-flowered plants (CRCR), 38 pink-flowered plants (CRCW), and 22 white-flowered plants (CWCW) what is the frequency of the CW allele in this population?
A. 0.48 or 48% B. 0.6 or 60% C. 0.4 or 40% D. 0.09 or 9% E. 0.52 or 52%
The width of a DNA double helix
a. is constant. b. is narrower where adenine is present than where cytosine is present. c. is wider where purines are present than where pyrimidines are present. d. varies randomly. e. is wider where pyrimidines are present than where purines are present.
Your microwave will not turn on, and you speculate that a circuit breaker in the house has been tripped. In scientific terminology, the steps would be described as:
A. developing an observation based on a hypothesis. B. developing a hypothesis based on an observation. C. testing a prediction generated from a hypothesis. D. forming conclusions from the results of experiments.
The process of evaluating evidence and its source carefully before drawing conclusions
A) Ecosystem
B) Informed consent agreement
C) Epidemiologic studies
D) Critical thinking
E) Homeostasis
F) Metabolism
G) Placebo
H) Theory
I) Hypothesis
J) Adaptive trait