When a molecule is heated, hydrogen bonds break readily. Which of the following describes how DNA will react if it is heated?
(A) The DNA will separate into individual nucleotides
(B) The sugars will separate from the phosphates
(C) The DNA will separate into 2 singles stranded sections
(D) The DNA will remain intact
Answer: (C) The DNA will separate into 2 singles stranded sections
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Exposure to light redistributes auxin to the opposite side of the stem or root that is exposed to light. In stems, this redistribution of auxin results in the stem growing and bending toward the light
In contrast, roots bend away from the light as they grow. What may be an advantage of the difference in bending of roots and stems? A. When stems bend toward the light as they grow, the leaves will shade the stem and keep it from getting too hot. B. When roots grow away from the light, they will grow deeper into the soil where they can absorb water and nutrients. C. When roots grow away from the light, the root cap will not be lost. D. When roots grow away from the light, light sensitive statoliths drive the bending of the cells back to the ground.
Summarize two pathways to colon cancer
What will be an ideal response?
Action potentials are
a. faster in neurons than in muscle cells. b. faster in muscle cells than in neurons. c. essentially the same in neurons and muscle cells. d. completely different in neurons and muscle cells. e. none of these.
Multiple sclerosis is a disease in which the myelin sheath is destroyed. What will happen to nerve conduction speed in affected neurons?
A) It will slow down dramatically. B) It will speed up dramatically. C) It will speed up just a little bit. D) There will be no effect.