The ________ is a double membrane that shields the nucleus.
A - DNA
B - Nuclear envelope
C - Chromatin
D - Nucleolus
Answer: B - Nuclear envelope
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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?
- How do large proteins enter the cell?
- 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?