The retinoblastoma (Rb) protein controls progression into S phase by regulating ________ activity.
A) cyclin D
B) p53
C) CDK4
D) E2F
E) CDC28
D) E2F
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When an apical meristem cell divides, one daughter cell is called the initial and the other is called the derivative. What are the fates of these cells?
a. The initial is used to form primary meristems, and the derivative remains part of the apical meristem. b. Both the initial and the derivative remain part of the apical meristem. c. The initial remains part of the apical meristem, and the derivative is used to form primary meristems. d. Both the initial and the derivative are used to form primary meristems. e. The initial is used to form primary meristems, and the derivative is used to form secondary meristems.
During pregnancy
a) the ovarian and uterine cycles occur more quickly then before b) GnRH is produced at a higher level than before c) the ovarian and uterine cycles do not occur d) the female secondary sex characteristics are not maintained
The shortest time required to kill or inactivate all the microbes in a sample at a specified temperature is called the
A. thermal death time (TDT). B. death phase point. C. sporicidal time. D. thermal death point (TDP).
Which of the following is associated with actions of aldosterone on principal cells?
A) increased potassium secretion B) decreased blood pressure C) increased calcium reabsorption D) increased sodium secretion E) decreased plasma osmolarity