Four of the following organisms belong in the same clade as members of class Reptilia. Which one does not?
A. Turtle
B. Fish
C. Birds
D. Lizards
E. snakes
Answer: B
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A variety of E. coli clones have been isolated, and the DNA has been extracted, digested with restriction enzymes, denatured, separated by gel electrophoresis, and transferred to nylon membrane by the Southern blot procedure. A radioactive probe is used that hybridizes with a gene of interest. The DNA corresponding to a single clone yields a single DNA band after probing the blot. Based on this
information only, A) all of the clones tested, except the one described, have the gene of interest. B) only the one clone described has the gene of interest. C) the gene of interest is located entirely on the DNA band visualized. D) the part of the gene recognized by the probe is located on the DNA band visualized. E) both choices B and D
Heritability studies cannot provide information about the number, location, or identity of genes involved in specific complex traits
a. True b. False Indicate whether the statement is true or false
Which animal has the simplest known central nervous system?
a. a flatworm b. an arthropod c. a chordate d. a mollusk e. an echinoderm
Which of the following would be a likely outcome if an individual had neutrophils that were incapable of diapedesis?
A. poor blood clotting B. inadequate production of antibodies C. numerous allergies D. repeated bacterial infections E. reduced numbers of circulating neutrophils