The cerebral cortex is highly folded. Why might this be an advantage for the functions of the cerebrum?
A) The increased surface area increases the area for higher-level thinking.
B) The increased surface area permits greater contact between the cerebrum and the cerebellum.
C) The folds form grooves that let the bones of the skull reach deeply down between brain regions.
D) The folds increase the areas where sensory receptors can reach the brain's surface.
A
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The reactions of the Calvin cycle used to be referred to as the "dark reactions" of photosynthesis, implying that light was not required for this pathway to incorporate CO2 into carbohydrate
However, in the absence of light the Calvin cycle shuts down. Which of the following parts of the Calvin cycle would be impacted FIRST by the absence of light energy? A. the reduction of 3-phosphoglycerate and the regeneration of RuBP B. the carboxylation of RuBP and the reduction of 3-phosphoglycerate C. the carboxylation of RuBP and the regeneration of RuBP D. the carboxylation of RuBP and the synthesis of hexose sugars
Steroid hormones act by
a. interacting with a target cell's DNA. b. activating mitochondria in target cells. c. acting on ribosomes for protein synthesis. d. stimulating mitosis. e. helping glucose into the target cell.
An activator protein would have which of the following effects on an operon with a positive control
mechanism? a. stimulate transcription b. turn off transcription c. stimulate transcription when a coactivator is bound to the allosteric site d. inhibit transcription when a coactivator is bound to the allosteric site e. no response
Ozone thinning over Antarctica was so profound that people referred to the lowest ozone region as the _________________.
A. ozone pollution layer B. greenhouse effect C. near-ground ozone D. radiation zone E. ozone hole