The first step of the scientific method is to
a. ask a question.
b. construct a hypothesis.
c. observe carefully.
d. formulate a prediction.
b
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The cells produced by mitotic divisions are considered to be ____
a. genetically identical b. genetically different c. clones d. similar but not exactly the same e. both genetically identical and clones
Exposing E. coli to calcium ions, then incubating the culture at low temperatures and finally heat
shocking the culture will accomplish:
a. artificial transformation. b. double crossing over. c. crossing over. d. constriction. e. infection.
What is the function of Taq polymerase?
A) to denature DNA so its strands separate B) to bond to complementary DNA C) to free nucleotides from a DNA strand D) to use primers to initiate DNA synthesis
Which of the following is an advantage of using chemical hormones as messengers rather than electrical signals to control body organs?
A. Different hormones can be targeted to different tissues because they are all chemically different. B. Chemical signals can spread to all tissues via the blood. C. Chemical signals are needed only in small amounts. D. Chemical signals can persist longer. E. All of the choices are correct.