Which molecule, when moving across a plasma membrane, would require the most ATP to be used?
A) a water molecule
B) a simple sugar, such as glucose
C) a dissolved gas, such as carbon dioxide
D) an ion moving against a concentration gradient
D
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Answer the question using the accompanying figure. In the figure, letter A represents a ____ taxon, which includes ____
a. polyphyletic; species from different evolutionary lineages
b. polyphyletic; an ancestral species and all of its descendants c. paraphyletic; an ancestral species and only some of its descendants d. monophyletic; species from different evolutionary lineages e. monophyletic; an ancestral species and all of its descendants
Humans are not the only animals known to use tools. Crows have been observed using twigs to extract food from holes or carry objects they would be unable to hold in their beaks. When presented with unreachable food floating in a narrow tube, crows will find small objects, such as pebbles, to drop into the tube, raising the water level until they can reach their prize. What kind of behavior does this demonstrate?
a. operant conditioning b. classical conditioning c. cognitive learning d. innate behavior
Sponges are ____
a. herbivores b. filter feeders c. scavengers d. predators e. carnivores
Successful reproduction can result in a
A) lower chance of future mortality. B) higher chance of future reproduction. C) lower chance of future reproduction. D) lower probability of flowering.