The importance of computers and of computer software to modern cladistics is most closely linked to advances in _____
A) light microscopy
B) radiometric dating
C) fossil discovery techniques
D) molecular genetics
D
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The signaling molecule involved in juxtacrine cell signaling is:
A. a small soluble peptide. B. a neurotransmitter. C. a transmembrane protein. D. a growth factor.
In sponges, spicules are ____
a. fibrous skeletal proteins b. specialized digestive cells c. complicated pore openings and passageways d. needle like skeletal structures made up of silica or calcium carbonate e. feeding cells with a flagellum surrounded by a collar
When root cells release the hormone abscisic acid (ABA), what is the result? a. Solutes exit guard cells, causing stomata to close
b. Epidermal cell secretions increase. c. Solutes enter guard cells, casing stomata to open. d. Root hairs grow in the direction of water and nutrient availability.
At what levels can eukaryotic gene expression be regulated? Which level is the most important for most genes?
What will be an ideal response?