Which of the following is not a function of the general transcription factor, TFIIH?
A. unwinding of the DNA near the transcriptional start site
B. recruits nucleotide excision repair proteins to the site of a DNA lesion
C. direct interaction with RNA polymerase II
D. recruitment of TFIID to the promoter
E. formation of the closed complex
D
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"Adult" stem cells are more accurately called tissue-specific or somatic stem cells because
A) they are also present in the tissues of embryos, fetuses, and children. B) some adults do not have them. C) whether they are present or not in an adult depends upon the individual's level of maturity. D) an adult body also contains embryonic stem cells.
Growing useful mutants that develop from callus culture is called ____
a. fragmentation b. protoplast fusion c. somaclonal selection d. grafting e. apomixes
Plant species A has a diploid number of 12. Plant species B has a diploid number of 16. A new species, C, arises as an allopolyploid from A and B. The diploid number for species C would probably be _____
A) 14 B) 16 C) 28 D) 56
Activation of a receptor tyrosine kinase will lead to _____.
a. phosphorylation of a cytoplasmic protein b. changes in conformation and/or activity of cytoplasmic proteins c. production of nitric oxide d. a and b are correct e. a, b and c are correct