Which of the following is most important for retaining water in soil for use by plants?
a. sand
b. humus
c. clay
d. silt
e. rock
B
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A key is placed into a keyhole then turned and the door opens. Which of the following components of cell signaling would best correspond to turning the key?
A. the hormone B. the receptor C. conformational change in the receptor once bound to the hormone D. signal transduction E. the cell response
Monosaccharides can be classified according to the spatial arrangement of their atoms.
a. true b. false
The higher the proportion of water in an organ, the (higher/lower) the concentration of alcohol.
What will be an ideal response?
You are studying a gene that has four exons and can undergo alternative splicing. Exon 1 has two alternatives, exon 2 has five alternatives, exon 3 has three alternatives, and exon 4 has four alternatives
If all possible splicing combinations were used, how many different splice isoforms could be produced for this gene? (a) 22 (b) 30 (c) 60 (d) 120