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Questions and Answers
What triggers the contraction of a muscle cell when a nerve impulse stimulates it?
What triggers the contraction of a muscle cell when a nerve impulse stimulates it?
- Potassium ions entering the nucleus
- Chloride ions rushing out of the ER membrane
- Calcium ions rushing back across the ER membrane (correct)
- Sodium ions rushing into the cytosol
Which structure regulates the entry and exit of most proteins and RNAs in a cell?
Which structure regulates the entry and exit of most proteins and RNAs in a cell?
- Pore complex (correct)
- Nuclear matrix
- Nuclear lamina
- Nuclear envelope
What maintains the shape of the nucleus by mechanically supporting the nuclear envelope?
What maintains the shape of the nucleus by mechanically supporting the nuclear envelope?
- Nucleolus
- Cisternae
- Pore complex
- Nuclear lamina (correct)
Where is ribosomal RNA assembled with protein to form ribosomal subunits?
Where is ribosomal RNA assembled with protein to form ribosomal subunits?
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What separates the internal compartment of the endoplasmic reticulum from the cytosol?
What separates the internal compartment of the endoplasmic reticulum from the cytosol?
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