How much mercury can the average human safely consume per day?
a. 2 micrograms
b. 7 micrograms
c. 12 micrograms
d. 55 micrograms
e. 90 micrograms
ANSWER: b
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Both walnut and Gingko trees lose their leaves in the fall when day length starts decreasing. Based on these observations, one may conclude that many tree species will lose their leaves in the fall in response to decreasing day length. This statement is an example of
A. a theory. B. an experiment. C. inductive reasoning. D. deductive reasoning.
Which of the following is not a feature of the "torpedo" model for RNA polymerase II transcription termination?
A. Conformational changes occur in the Pol II elongation complex when elongation factors dissociate. B. RNA is cleaved downstream from the poly(A) site. C. Exonuclease degradation of RNA promotes Pol II release. D. Pol II remains associated with the DNA template after mRNA synthesis. E. All of the choices given are a feature of the "torpedo" model.
Pattern formation during embryonic development is based on
a. a promoter and one or more operators. b. post-translational modification. c. RNA interference. d. dosage compensation. e. maternal mRNA gradient in the embryo.
Which type of cell secretes antibodies into the blood?
A) Memory B) Cytotoxic T C) Helper T D) Plasma