If a C3 plant that normally closes its stomata during hot, dry conditions were triggered to open them instead, the most likely outcome would be that
A. O2 enters the leaf, increasing the rate of photosynthesis.
B. Glucose leaves the leaf, increasing the rate of photosynthesis.
C. Water leaves the leaf, decreasing the rate of photosynthesis.
D. CO2 enters the leaf, decreasing the rate of photosynthesis.
E. More chlorophyll is made, increasing the rate of photosynthesis.
Answer: C
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Which mollusk group can be described as having several calcium carbonate plates along their dorsal side?
A) bivalves B) gastropods C) chitons D) cephalopods
Scientists observed that over the past 40 years, marmots are located at increasing elevations on mountains. What is the best explanation for this observation?
A. The marmots are adapting to the cold temperatures. B. Other species are competing with the marmots for their normal habitat. C. More snow and rain is falling at the top of the mountains. D. It is becoming colder at the top of the mountains. E. It is becoming warmer at the top of the mountains.
The most ancient branching point in the phylogeny of animals is the one that distinguishes between having:
a. single cellularity and multicellularity. b. radial or bilateral symmetry. c. defined tissues or no tissues. d. growth by molting or by continuous additions. e. first gut opening develop into a mouth and first gut opening develop into an anus.
Which of the following is the best description of a precursor metabolite?
A. A macromolecule consumed in the first steps of metabolism B. An intermediate in the formation of cursor metabolites C. A carbon skeleton used as a starting substrate D. An enzyme that is reduced in a metabolic reaction