About a day after fertilization, the zygote undergoes ________, which is a rapid series of cell divisions
Fill in the blank(s) with correct word
cleavage
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In the Northern Hemisphere, recall that atmospheric CO2 levels are highest in early spring and lowest during early fall. What accounts for this seasonal fluctuation in atmospheric CO2 levels? Select all that apply
A. photosynthesis B. human activities C. respiration D. biomineralization E. plate tectonics
When a seed germinates, the embryo emerges from its dormancy and begins which phase of the plant life cycle?
A. sporophyte generation B. gametophyte generation C. dicot generation D. monocot generation E. alternate generation
Select that statement that reflects evidence that directly supports the endosymbiotic theory.
A. Lysosomes contain their own DNA in the form of plasmids. B. The electron transport system is located in the cell membrane in bacteria, while in eukaryotes it is located in the mitochondrial cristae. C. Enzymes for photosynthesis are found embedded in membranes of the Golgi apparatus. D. Glycolysis occurs in the cytoplasm of bacterial cells.
If guard cell membranes are poisoned with a chemical that inhibit the uptake of k+ , what will happen to the leaf?
a) membranes of leaf tissue dies because of poison. b) the guard cell will become turgid. C) the water potential of guard cell become more negative and gain water. D) leaves cannot transpire because guard cell collapse." E) the water potential of guard cell become less negative and loose water.