Which of the following processes is central to the initiation of transcription?
A) binding of sigma to the promoter region
B) formation of a phosphodiester bond in the elongating RNA strand
C) binding of DNA polymerase to the promoter region
D) formation of a DNA primer
Answer: A
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The fertilized egg is totipotent, whereas the cells from the inner cell mass, called embryonic stem cells, are pluripotent. Only the embryonic stem cells can give rise to the entire organism
A. true B. false
Lizards and snakes are living representatives of which of the following lineages?
a. anapsids b. archosaurs c. lepidosaurs d. synapsids e. dinosaurs
Replacing a patient's defective gene with a fragment containing a functional gene is
A. gene therapy. B. genomics. C. gene cloning. D. gene mapping. E. gene selection.
Where is the primary meristem located?
A. root and stem tips B. vascular tissue C. dermal tissue D. stem tip only E. woody stem