Questions and Answers
98% of the molecules in the plasma membrane are ______.
lipids
Various movements of the ____ keep the membrane fluid.
phospholipids
Dispersed throughout the membrane are _______ that may be transmembrane or peripheral.
proteins
The membrane is stiffened in some spots, decreasing its fluidity, by _______ molecules.
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The ____________ surrounds the cell and is made of proteins and __________.
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The composition of the plasma membrane can differ from one region of the ____________ to another.
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The material between the plasma membrane and the nucleus is called the __________.
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The cytoplasm consists of a fluid, called ____________, and several functional units of the cell, called ____________.
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Click and drag each label into the correct category to indicate whether it pertains to the cytoplasm or the plasma membrane.
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Determine from the description which cellular structure each phrase is describing.
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What are extensions of the plasma membrane that serve primarily to increase a cell's surface area called?
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Click and drag each cellular component to the appropriate category based on whether or not it is bound by a membrane.
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Which membrane-bound organelle is the site of protein and lipid synthesis?
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What is the function of the highlighted organelle?
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What is the function of the highlighted organelle?
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What is the function of the highlighted organelle?
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Lysosomes are membrane-bound vesicles that arise from the __________.
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The lysosome contains ________ enzymes.
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Lysosomes function in the destruction and recycling of old organelles.
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Study Notes
Plasma Membrane Composition
- 98% of molecules in the plasma membrane are lipids, primarily phospholipids.
- Phospholipids allow various movements that maintain membrane fluidity.
- Proteins within the membrane can be transmembrane or peripheral.
Structural Components
- Cholesterol molecules stiffen certain areas of the membrane, reducing fluidity.
- The plasma membrane surrounds the cell and is composed of proteins and lipids.
- Plasma membrane composition can vary across different cell regions.
Cytoplasm Definition and Composition
- The cytoplasm is the material located between the plasma membrane and the nucleus.
- It consists of cytosol (the fluid component) and various organelles (functional units).
- Organelles include membrane-bound structures like mitochondria, lysosomes, and the endoplasmic reticulum.
Cell Membrane and Cytoplasm Functions
- The plasma membrane is crucial for containing ion channels and interacting with extracellular fluid (ECF).
- The cytoplasm comprises structures like the cytoskeleton, fibers, and organelles, which support and facilitate cellular functions.
Cellular Structures
- Microvilli are extensions of the plasma membrane that enhance surface area for absorption.
- Membrane-bound organelles include the nucleus, mitochondria, lysosomes, endoplasmic reticulum (ER), and Golgi complex.
- Non-membranous structures include ribosomes, centrosomes, centrioles, glycogen granules, and the cytoskeleton.
Organelles and Their Functions
- The endoplasmic reticulum is the site for protein and lipid synthesis.
- Organelles have specialized functions such as regulating transport and modifying proteins.
- Mitochondria are responsible for producing ATP through cellular respiration.
- Lysosomes, formed from the Golgi complex, contain hydrolytic enzymes for breaking down cellular components.
Lysosomes
- Lysosomes play a key role in destroying and recycling old organelles, maintaining cellular health.
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Description
This quiz contains flashcards relevant to Chapter 3 of A&P 171, focusing on key terms and concepts regarding the plasma membrane. Test your knowledge on lipids, proteins, and the fluidity of membranes with these engaging flashcards.
