Which of the following is/are likely to limit the maximum size of a cell?
a. the time it takes a molecule to diffuse across a cell
b. the cell's surface-to-volume ratio
c. the shape of the cell
d. all choices are correct
e. none of the choices are correct
Answer: d. all choices are correct
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In gametogenesis in both human males and females (select all correct choices):
A. diploid stem cells are the precursors to haploid gametes. B. stem cells form during embryonic development and divide by mitosis. C. primary spermatocytes and primary oocytes form by mitosis from diploid stem cells. D. secondary spermatocytes and secondary oocytes form by meiosis from primary spermatocytes and primary oocytes. E. None of these choices are correct.
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
Estrogen is most likely to exert its effects by regulating
A. protein kinases. B. phopholipase C. C. expression of genes and production of specific proteins. D. cyclic AMP. E. Ca2+.
The breakdown of pyruvate in the Krebs cycle
results in the release of a. energy. b. carbon dioxide. c. oxygen. d. hydrogen. e. all except oxygen.