Biological species consist of groups of ______.
a. families
b. genera
c. domains
d. populations
Answer: d. populations
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If a foreign gene is cloned into an expression host, it is important that the host itself
A) not produce the protein being studied. B) produce the protein in larger amounts than the vector. C) repress the genetic expression being studied. D) produce signal proteins to tag the host protein.
What is the first stage of embryonic pattern development in Drosophila?
A. limb position B. body axes C. segmentation patterns D. metamorphosis
Parabronchi are characteristic of:
a. insects. b. spiders. c. mollusks. d. birds. e. mammals.
A student uses restriction enzymes to cut a DNA molecule into fragments. The digested DNA is loaded into the wells of an agarose gel and the gel is subjected to an electric current. Upon completion of the run, the gel is stained. Which of the following is true of the dye used to stain the fragments?
(A) It increases the contrast between the agar and the DNA fragments. (B) It must be accounted for when calculating the molecular weight of the fragments. (C) Its charged areas interfere with the migration of the DNA. (D) It is bonded only to the sticky ends of the fragments and can directly determine the sequence of the DNA fragments. (E) It gives a three-dimensional view of the structure of the DNA fragments.