How do large proteins enter the cell?
A - With a nuclear localization signal
B - By stretching the nuclear pore
C - All of these
D - With chemical energy
E - Helped by an import protein
Answer: The NLS is a specialized amino acid sequence that allows larger proteins into the nucleus. If they have this they will then pass through import proteins, using chemical energy to cause the pore to stretch.
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Cell Biology
- Which of the following is NOT true of the endomembrane system?
- What is another term for the intracellular space?
- Which of the following does NOT take place in the nucleus?
- What type of cell might have more smooth ER?
- What are ribosomes comprised of?
- Which of the following first binds to the mRNA message?
- Where are the A, P, and E sites located?
- Which ribosomal site joins amino acids via a polypeptide bond?
- Where can you NOT find ribosomes preforming translation?
- Where is the starting point of ribosome synthesis?
- Which of the following helps maintain the shape of the nucleus?
- Which process best describes the internalization of a specific protein outside the cell?
- The ________ is a double membrane that shields the nucleus.
- Exocytosis can be used to secrete newly made proteins out of the cell. It can also be used to add _____ directly to the cell membrane.
- A foreign cell has entered your blood stream. Which process describes how it can be engulfed by one of the cells in your immune system?
- Active transport involves
- Which process best describes non-specific internalization of dissolved ions outside the cell?
- Which of the following is true of the lysosome?
- A sodium potassium pump is a type of
- This type of integral membrane protein moves two substances in the same direction.
- What type of integral protein helps molecules move across the cell membrane by binding and releasing them?
- Chemical energy is required for active transport to establish a specific concentration gradient. In a sodium potassium pump, chemical energy specifically serves to help the pump
- Why does active transport require energy?
- What type of transport uses membrane proteins to passively move solutes?