________ produce 40 to 50 percent of the organic carbon in the ocean.
Fill in the blank(s) with the appropriate word(s).
Diatoms
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The master gene Hox helps to sculpt the body plan of
embryos by a. inhibiting the Dlx gene to prevent extra limbs. b. timing the activation of Dlx genes. c. causing cell death in any cell not expressing the Hox gene. d. converting sugar into energy to allow the process to go to completion. e. inducing mutations in plants.
The first major divergence of life gave rise to all of
the following except a. bacteria. b. archea. c. ancestors of the eukaryotes. d. endomembrane system. e. all of these.
The chemicals in "beta-blocker" drugs reduce anxiety symptoms by:
A) binding to beta-receptors, thereby preventing adrenaline from binding to the cell. B) causing cholesterol to bind to beta-receptors, thereby blocking adrenaline from binding to the cell. C) causing carbohydrates to bind to beta-receptors, thereby blocking adrenaline from binding to the cell. D) preventing receptor proteins from binding to the lipid bilayer of a cell membrane. E) preventing receptor proteins from binding to enzymatic proteins.
Protozoa can survive changes in pH, nutrient availability or temperature as (conidospores /cysts/trophozoites).
Fill in the blank(s) with the appropriate word(s).