Which of the following lists the correct descending taxonomic hierarchy (left to right)?
A. class, phylum, order
B. family, order, class
C. kingdom, domain, phylum
D. genus, species, family
E. family, genus, species
Answer: E
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A common motif found in transposons and integrases is the DDE motif. Which of the following is a true statement with regard to the DDE motif?
A. This motif refers to the three consecutive amino acids that are found in the primary sequence of transposons and integrases. B. This motif refers to the presence of three amino acids not arranged consecutively in the proteins primary sequence but present together in the active site. C. The DDE motif is composed of two glutamates and one aspartate. D. Conservation of the DDE motif has not been useful in demonstrating evolutionary relatedness among transposases and integrases. E. The DDE motif is a structural similarity but has no functional relation in transposases and integrases.
Dense, regular tissues that connect bone to bone are called
a. muscles. b. cartilage. c. ligaments. d. tendons. e. organelles.
What structures regulate blood flow into capillary beds?
A) precapillary sphincters B) venous valves C) postcapillary sphincters D) Peyer's patches
Which of the following is TRUE of spirochetes?
A. they are peritrichous. B. they are Gram-positive. C. they are able to penetrate a host's tissues. D. they are obligate intracellular organisms. E. they are pleomorphic.