Most taxonomic groups with simple multicellular organisms never gave rise to complex multicellular descendants
A. true
B. false
A
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All of the following can contribute to desertification
EXCEPT a. drought. b. overplowing. c. overgrazing. d. farming in areas with high winds. e. all of these.
Which statement is NOT true about water uptake in a plant root?
A. Water enters the root from the soil by osmosis. B. Water enters the cytoplasm of the root hairs by active transport. C. Water must enter the cytoplasm of the endodermal cells to get past the Casparian strip. D. Water travels by diffusion through the cell walls of the epidermis and cortex.
During photosynthesis, high-energy carbohydrates are produced at the end of
A) light absorption by chlorophyll.
B) cellular respiration.
C) the light reactions.
D) the Calvin cycle.
E) the electron transport pathway.
Which of the following types of cells is NOT infected by HIV?
A) T cells B) B cells C) macrophages D) monocytes E) microglia