Bacteria use ______ attached TO the polymerase to direct RNA polymerase to promoters; eukaryotic cells use ______ that attach directly to the DNA first instead
A. sigma factors; transcription factors
B. transcription factors; sigma factors
C. ribosomes; sigma factors
D. tRNA; rRNA
A
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Which of the following events must occur to cause a chromosomal translocation, such as that seen in individuals with chronic myelogenous leukemia (CML)?
A. One chromosome must break in two distinct locations. B. Two different chromosomes must break. C. A transposon must be present in one of the chromosomes. D. The broken ends must pair correctly. E. A mutation in the DNA must occur.
Which of the following represents an early stage in
primary succession? a. pine trees b. moss and lichens on bare rock c. weedy annual plants in an open field d. climax species in succession e. alder, cottonwood, and willow thickets
Which one of the following does not match a component of the amniotic egg with its primary function?
A. Shell-porous, protective covering B. Yolk sac-provides food for the embryo C. Allantois-segregates nitrogenous wastes from embryo D. Chorion-exchange of respiratory gases; retention of water E. Amnion-encloses embryo within an oxygen-filled cavity