Water moves from an area of [blank] water potential to [blank] water potential.
a. high; low
b. low; high
c. concentrated; dilute
d. dilute; concentrated
Ans: a. high; low
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Why can an infection in the brain's ventricles usually be detected in spinal fluid obtained from the lower back (lumbar region)?
A. Cerebrospinal fluid (CSF) originates in the ventricles, but percolates over and around the brain and spinal cord. B. There is a high degree of vascularity that exists, allowing easy transfer of bacteria in the cerebrospinal fluid (CSF) and the blood. C. There is a set of lymph nodes specifically in place to drain the cerebrospinal fluid (CSF) from the ventricles. They are housed in the lumbar region of the spinal column, adjacent to the spinal cord. D. This is an incorrect statement. Since the central nervous system (CNS) is a protected site due to the blood-brain barrier, there can never BE an infection in the ventricles.
In some genetically engineered tomatoes, fruit ripening was delayed by crippling the gene that produces which hormone?
A. auxin B. ethylene C. abscisic acid D. gibberellin E. cytokinin
Sometimes when I have my morning coffee, which I drink black with no cream or sugar, I notice a thin film floating on top of the coffee
Since I have just read Chapter 3 of the text, I now realize the nature of this substance and so I run to my friend screaming, "Look at this ________ in my coffee!" A) hydrophilic substance B) hydrophobic substance C) disaccharide D) polysaccharide
Regarding megafaunal extinctions, it is assumed that the driving factor was
A. climate change. B. rising sea levels. C. a meteorite. D. the Ice Age. E. Homo sapiens.