An example of an animal with an incomplete gut is a(n)
A. planarian.
B. earthworm.
C. squid.
D. human.
E. grasshopper.
Answer: A
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In one of these years, there was a drought. Which year does it appear to be?
a. 2009 b. 2010 c. 2011 d. 2012
Which of the following is FALSE regarding
morphogens? a. They are long-range signals in pattern formation. b. They are encoded by master genes. c. They affect gene expression. d. Their concentration increases with distance from source. e. All of these are true
You are interested in studying the expression of a gene associated with human cancer during fetal development. Which of the following might be useful to study the expression of this gene over time?
A) DNA microarrays B) genome-wide association studies C) Southern blot analysis D) in situ hybridization E) DNA microarrays and in situ hybridization
A balloon permeable to water but not to glucose contains a 10% glucose solution. A beaker contains a 5% glucose solution. Which of the following is TRUE?
A) The solution in the beaker is hypertonic relative to the solution in the balloon. B) The solution in the balloon is isotonic; the solution in the beaker is hypertonic. C) The solution in the balloon is hypotonic relative to the solution in the beaker. D) The solution in the balloon is hypertonic relative to the solution in the beaker.