The role(s) of CSF is/are ___________.
a. to maintain pH balance
b. to maintain hormone balance
c. to protect the brain from injury
d. none of the above
e. a and c
Answer: e. a and c
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Miller and Urey's experiment was ground breaking because
A. This was the first example of an experiment being used that inserted oxygen into the prebiotic soup. B. This was the first attempt to apply scientific experimentation to the quest of understanding the origin of life. C. They hypothesized what could have been the first molecules formed, but they could not demonstrate this in a scientific experiment. D. This was the last experiment that used boiling water as a trigger mechanism for the production of macromolecules. E. This was the first experiment based on the theory that organic carbon actually arrived from outer space.
In secondary active transport, when the driving ion concentration is high and the transport ion concentration is low
outside of the cell, in which direction will the two ions move?
a. As the driving ion moves in, the transport ion moves in. b. As the driving ion moves in, the transport ion moves out. c. As the driving ion moves out, the transport ion moves in. d. As the driving ion moves out, the transport ion moves out. e. As long as both ions are moving together, they can go either in or out.
Which type of dinosaur might possess long and sharp, as well as large and flat teeth?
a. Carnivore b. Herbivore c. Omnivore
Which of the following makes up most of an old tree trunk?
A) Secondary phloem B) Primary phloem C) Vascular cambium D) Primary xylem E) Secondary xylem