In what biome do plants tend to be evenly spaced with large, shallow root systems? Why?
What will be an ideal response?
In deserts, water is very scarce, and intense competition among plants leads to a partitioning of resources that produces an even spacing pattern. Because desert storms can be brief and intense, large, shallow roots can soak up the water quickly.
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Water provides electrons, hydrogens, and oxygen in photosystem I. The resulting electrons in photosystem I
A. replace the electrons lost by chlorophylls. B. are added to hydrogens so they can be transported across the thylakoid membranes more easily. C. directly pass through ATP synthase enzymes to activate them in transforming ADP to ATP. D. are added back to oxygen. E. are used by the rubisco enzyme to complete carbon fixation with RuBP and CO2.
Which phrase describes the events that occur in the production of a pollen grain from a microspore mother cell?
a. Only meiosis occurs. b. First mitosis occurs, and then meiosis, followed by mitosis. c. First meiosis occurs, and then mitosis. d. First mitosis occurs, and then meiosis.
For most metazoans, what is the name of the innermost tissue layer during development?
a. mesoderm b. epiderm c. endoderm d. ectoderm
Growth factors stimulate
A) the cell to skip the S and G1 phases of interphase and undergo mitosis directly. B) cells to divide. C) the cell to ignore the checkpoints of the cell cycle. D) Cdks to synthesize enzymes that digest cyclins.