Symport proteins
1.transport a single molecule or ion.
2.transport two or more ions in the same direction.
3.transport two or more ions in opposite directions.
4.aren't involved in transport.
5.None of the options is correct.
2
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Auxin has an effect on plant embryos much like the Bicoid protein in Drosophila. If auxin were added to a culture of embryonic root cells, what would be the likely result?
A) Root cells would elongate and mature. B) Root cells would change into meristem cells. C) Root cells would halt their development. D) Root cells would not respond to auxin.
Peripheral vasoconstriction is a response to
a. heat. b. hunger. c. cold. d. exercise. e. thirst.
The rate of enzyme activity decreases by half when the body temperature drops by
a. 5? F. b. 8? F. c. 2? F. d. 6? F. e. 10? F.
Tetanus is a very serious disease caused by a toxin from a bacterium. Which of the following is the most obvious symptom?
A) muscle paralysis B) excessive weight gain C) excessive sneezing D) dissolving bones