In the DNA sequencing procedure, each of the four nucleotides is distinguished from the others by
A. its molecular size.
B. its position on a gel.
C. its chemical properties.
D. the color of a fluorescent dye attached to it.
E. how much of it is present.
D
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According to the pressure-flow hypothesis of phloem transport, _____
A) solute moves from a high concentration in the source to a lower concentration in the sink B) water is actively transported into the source region of the phloem to create the turgor pressure needed C) the combination of a high turgor pressure in the source and transpiration water loss from the sink moves solutes through phloem conduits D) the formation of starch from sugar in the sink increases the osmotic concentration E) the pressure in the phloem of a root is normally greater than the pressure in the phloem of a leaf
The following nutrient most associated with
eutrophication is: a. iron. b. hydrogen. c. oxygen. d. carbon. e. phosphate.
The process in succession in which the actions of early-arriving species enable the success of later-arriving species is:
A) mutualism. B) coevolution. C) mimicry. D) facilitation.
All of the following are associated with bubonic plague except
A. it is transmitted by human feces. B. the caused by Yersinia pestis. C. the patient often has enlarged inguinal lymph nodes. D. the patient has fever, headache, nausea, weakness. E. it can progress to a septicemia.