An organism that is capable of living without oxygen if necessary is termed a(n)
A) aerobe.
B) facultative anaerobe.
C) obligate anaerobe.
D) aerotolerant anaerobe.
Ans: B) facultative anaerobe.
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Why are epithelial membranes not very thick?
A. Epithelial tissues are required to support other cells growing on top of the tissue. B. Epithelial tissues play a critical role in transport, and must be thin to allow diffusion to occur. C. Epithelial tissues can only reach a certain thickness because their growth is constrained by microtubules inside the cell membrane. D. Thick epithelial tissues would collapse due to the drying effect of the environment. E. Epithelial tissues are programmed to stop dividing after only a few cell cycles.
An F' plasmid results when
A. an integrated F plasmid is incorrectly excised, bringing host genes with it. B. an F+ × F- mating is interrupted before completion. C. an Hfr × F- mating is interrupted before completion. D. None of the choices are correct.
SCNT with human cells is called _____
Fill in the blank(s) with correct word
The primary function of DNA ligase is to
a. cut the two strands of DNA molecule prior to replication. b. attach free nucleotides to a growing chain. c. remove bases that might have been inserted incorrectly. d. seal any tiny gaps in the new DNA. e. fragment old DNA that is no longer of use to the cell.