As observed in animal stem cells, plant stem cells are able to
A. exist as mature cells.
B. produce nutrients for other cells.
C. remain undifferentiated but can divide to produce cells that generate new tissues.
D. fight microbial invaders by becoming mobile and phagocytic.
C. remain undifferentiated but can divide to produce cells that generate new tissues.
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Heavy rains cause the lava flow to erode and A1 and A2 are now sympatric. Was speciation sympatric?
What will be an ideal response?
The only group of fungi to have a flagellated
stage are the a. Chytrids. b. Ascomycetes. c. Basidiomycetes. d. Glomeromycetes. e. Zygomycetes
The Egyptians believed in all of the following race categories except:
A. yellow B. red C. white D. brown
Which statement concerning biological clocks is false?
A) Innate circadian rhythms are generally about 24 hours in length. B) Circadian rhythms occur with or without external stimuli. C) Biological clocks are strongly influenced by external temperatures. D) Movement of plants long distances very quickly induces a kind of plant "jet lag."