Once they evolved, the ________ forever changed the atmosphere on Earth.
A. protists
B. land plants
C. bacteria
D. cyanobacteria
Answer: D
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The molecular explanation for narcolepsy is that
A) certain brain cells have many extra orexin/hypocretin receptors, so these cells receive too many messages to sleep. B) the orexin/hypocretin receptor does not reach the cell surfaces of certain brain cells. C) a gene is missing in chromosome 6 that encodes the protein narcoleptin. D) a viral infection activates genes that promote sleep.
Reduction of environmental temperatures to freezing rapidly leads to cell death as a result of ____
a. inhibition of cell division b. inhibition of molecule transport across the cell membrane c. increased cellular signaling d. increase in metabolic reactions e. decreased lipid synthesis
A family pedigree is used to assemble information about the occurrence of heritable characters in parents and their offspring across several generations.
a. true b. false
Consider the following proposed determining function for a student's grade on the econometrics final, FinalGradei = 68 + 4 HoursStudiedi - 2 Num Other Finalsi + Ui, where hours studied is the number of hours studied during finals week by student i, and number of other finals is the number of other finals student i has during finals week. Derive the formula for the change in a student's final grade with respect to a unit change in the number of other finals the student has in finals week.
A. Final Grade equals 66. B. Final Grade increases by 2. C. Final Grade decreases by 2. D. Final Grade increases by 4.