When an action potential begins and sodium channels open, why does sodium rush into the cell? (Check all that apply.)
_____ The inside of the cell is negatively charged.
_____ The inside of the cell is positively charged.
_____ Chloride ions are waiting to bind to the sodium inside the cell.
_____ The diffusion gradient drives sodium into the cell.
_____ Channels use energy to move ions across the membrane whenever they are open.
__X__ The inside of the cell is negatively charged.
_____ The inside of the cell is positively charged.
_____ Chloride ions are waiting to bind to the sodium inside the cell.
__X__ The diffusion gradient drives sodium into the cell.
_____ Channels use energy to move ions across the membrane whenever they are open.
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a. methane b. ethyne c. cyclohexane d. ethane e. benzene
Glycolysis occurs in the ________; the Krebs (TCA) cycle occurs in the ______ of eukaryotes and the ______ of prokaryotes.
a) cytoplasm, mitochondria, mitochondria b) cytoplasm, mitochondria, cytoplasm c) cytoplasm, photosynthesis, cytoplasm d) mitochondria, cytoplasm, mitochondria
Which of the following combinations of chromosomes would be found in a person afflicted with Turner syndrome?
A) XO B) XX C) XYY D) XXY E) XY
Which of the following statements concerning the role of redox reactions in photosynthesis and cellular respiration is true?
A) In photosynthesis, carbon dioxide is oxidized to form sugar, while in respiration, sugar is reduced to form carbon dioxide. B) In photosynthesis, carbon dioxide is reduced to form sugar, while in respiration, sugar is oxidized to form carbon dioxide. C) Photosynthesis involves both reduction and oxidation, while respiration involves only oxidation. D) Photosynthesis involves only oxidations, while respiration involves only reductions. E) Photosynthesis involves only reductions, while respiration involves only oxidations