Which of the following distinguish the field of microbiology from other fields of biology?
A. The techniques used to study organisms regardless of their size.
B. Neither the size of the organism studied nor the techniques employed in the study of organisms regardless of their size.
C. The size of the organism studied.
D. Both the size of the organism studied and the techniques employed in the study of organisms.
Answer: D
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Which of the major tissue types has shortening of cells (i.e., contraction) as its major function?
A. nervous B. muscular C. epithelial D. connective E. All of the choices are correct
One strain of rII- phage has a deletion in the rII region, another has a point mutation in the rII region. When E. coli K(?) cells are infected with either rII- phage (not both) no plaques form. When E. coli K(?) cells are infected with both rII- phage simultaneously plaques do form. Why do plaques form when E. coli K(?) cells are infected with both types of rII- phage simultaneously?
A) Recombination between the two phage genomes resulted in a wild-type phage. B) The two phage have mutations in different rII genes and their genomes complement each other. C) A protein made by the deletion phage can repair the DNA of the phage with the point mutation. D) Bacteria can survive infection with one phage, but they cannot survive infection with two phages.
Lamarck’s contribution to the theory of evolution is the concept of
a. natural selection. b. catastrophism. c. inheritance of acquired characteristics. d. mutation. e. geographic distribution of organisms.
In a grazing food chain,
A. secondary consumers eat detritus. B. secondary consumers eat photosynthetic organisms. C. primary consumers eat detritus. D. all the consumers are primary consumers. E. primary consumers eat photosynthetic organisms.