During the cell cycle, check points serve to be sure that the cell is ready to go through the next part of the cell cycle.
a. true
b. false
Answer: a. true
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Change in the DNA-histone complex that can increase or decrease transcriptional activity is termed
A) induction. B) gene regulation. C) chromatin remodeling. D) nucleosome formation. E) None of these
Which organisms obtain heat primarily from the external environment?
a. endotherms b. ectotherms c. exotherms d. isotherms
Which statement is NOT true about woody stems?
A. Cork cambium produces waterproof cork cells that become bark. B. The vascular cambium is located between the xylem and phloem of the vascular bundles in a woody stem. C. The stem is organized into a central pith, wood, and outer bark. D. Secondary phloem accumulates to form the wood. E. Woody stems contain secondary growth.
What is the name of the protein that appears to regulate the entry of cells into an S phase? This protein is also known as the "guardian of the genome."
A) cyclin B) p53 C) phosphokinase D) p34 E) p102