The appearance that the spindle and sister chromatids are inactive at metaphase is misleading because
A) the sister chromatids are completing replication at numerous replicons.
B) the sister chromatids are signaling reformation of the nuclear envelope.
C) each sister chromatid is assembling a kinetochore.
D) each sister chromatid is being pulled toward its respective pole.
E) the sister chromatids are decondensing.
Answer: D
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After wearing a watch for a period of time you are no longer as aware of its presence on your wrist. This is an example of:
A. lateral inhibition. B. adaptation. C. temporal summation. D. desensitization.
In plants, which of the following cells is (are)
diploid?
a. egg cell b. sperm cell c. spore cell d. root cell e. all of these cells are haploid
Decompression sickness occurs when which gas forms bubbles in the blood?
a. oxygen b. carbon dioxide c. carbon monoxide d. methane e. nitrogen
Which one or more of the following is true about root endodermis?
A. The endodermis contains impermeable lignin and suberin called a Casparian strip that controls water and nutrient movement between adjacent cell walls. B. The endodermis is two to three layers of spherical cells. C. The endodermis forms a boundary between the cortex and inner vascular cylinder of the root. D. All of the choices are true of root endodermis. E. The endodermis forms a boundary between the cortex and inner vascular cylinder of the root and contains impermeable lignin and suberin.