Gametophytes that are completely enclosed within the walls of a spore are known as
A. heterosporic lycophytes.
B. endosporic gametophytes.
C. micropyles.
D. endospermic sporophytes.
E. phragmoplasts.
B. endosporic gametophytes.
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What stops the rapid depolarization that occurs as the "upsweep" of membrane potential peaks during the action potential?
A. Closing of the voltage-gated Na+ channel activation gate. B. Closing of the voltage-gated Na+ channel inactivation gate. C. Opening of the voltage-gated K+ channel gate. D. Both opening of the K+ channel gate and closing of the Na+ channel inactivation gate. E. Both opening of the K+ channel gate and closing of the Na+ channel activation gate.
In the study involving periwinkle snails and their algal food sources, which conclusion can be drawn?
a. Periwinkles eliminated all algae and died out. b. Periwinkles eliminated all of the less dominant algae species. c. Periwinkles eliminated the dominant algae entirely. d. Periwinkles had no effect on the algae populations. e. Periwinkles can increase or decrease species richness depending on which algal species it is consuming.
The saltwater aquarium strain of Caulerpa taxifolia
a. thrives on sandy or rocky shores and in mud. b. outcompetes endemic species. c. is now illegal to import into the United States. d. produces a toxin that poisons invertebrates and fish that might keep it in check. e. includes all of these descriptions.
________ forests typically grow in the intertidal zone of tropical coasts where wave action is absent, sediments accumulate, and the muds are anoxic
Fill in the blank(s) with correct word