What happens immediately following the closing of the sodium gates during an action potential?
a. Sodium ions enter the cell.
b. Sodium ions leave the cell.
c. Potassium ions enter the cell.
d. Potassium ions leave the cell.
e. Calcium ions leave the cell.
D
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Transcription in eukaryotes occurs in the
A) RNA polymerase. B) endoplasmic reticulum. C) cytoplasm. D) nucleus.
Which of the following is the binding site for
RNA polymerase on the DNA molecule? a. structural gene 1 b. repressor gene c. promoter sequence d. operator sequence e. region between an operator and the first structural gene
Posttranslational modifications to proteins produced by the rough endoplasmic reticulum are accomplished by __________.
a. mitochondria b. Golgi apparatus c. messenger RNA d. smooth endoplasmic reticulum
Exergonic reactions
A. do not occur in anaerobic cellular respiration. B. include synthesis of large carbohydrates. C. only occur in heterotrophs. D. occur when ADP binds to inorganic phosphate to form ATP. E. occur during aerobic cellular respiration.