Chapter 5 (Exam Two) Flashcards
The __________ is common to all cells.
Plasma membrane
The _________ is a phospholipid bilayer with embedded proteins and cholesterol.
Plasma membrane
Phospholipids are ________ molecules, having both hydrophilic and hydrophobic regions; nonpolar tails (hydrophobic) are directed ____, polar heads (hydrophilic) are directed _____ to face both extracellular and intracellular fluid.
Amphipatic; inward; outward
Nonpolar tails are?
Hydrophobic
Polar heads are?
Hydrophillic
Proteins in the plasma membrane can be _____ or _____?
Peripheral; Integral
_____ are found on one side of the inner membrane suface?
Peripheral protiens
____ are partially or wholly embedded (transmembrane) in the plasma membrane?
Integral protiens
_____ are usually found in the membrane and are held in place by the cytoskeleton and the extracellular matrix (ECM).
Integral proteins
The _____ is only found in animals and its function includes supporting the plasma membrane and communicating between cells.
EMC
____ affects the fluidity of the membrane?
Cholesterol
The ______________ describes the plasma membrane.
Fluid-Mosaic model
Fluidity of the plasma membrane allows cells to be ____
Pliable
Proteins bond to the _____ and/or _____ to prevent movement in the fluid phospholipid bilayer
ECM; Cytoskeleton
_____ have a structure similar to phospholipids except the hydrophilic head is a variety of sugar; they are protective and assist in various functions.
Glycolipids
_____ have an attached carbohydrate chain of sugar that projects externally.
Glycoprotiens
_____ have an attached carbohydrate chain of sugar that projects externally.
Glycoproteins
In animal cells, the ____ is a “sugar coat” of carbohydrate chains and has several functions?
Glycocalyx
The immune system recognizes foreign tissues that have ______________
Inappropriate carbohydrate chains
Carbohydrate chains are the basis for ____________ in humans?
A, B, and O blood groups
3 Components of the Plasma Membrane?
- Lipid component referred to as phospholipid bilayer
- Protein molecules
- Cholesterol
What allows passage of molecules through membrane(cross a membrane) via a channel in the protein?
Channel Protiens
What combines with the substance to be transported
and assists passage of molecules through membrane?
-Also ____ selectively interact with a specific molecule so it can cross the plasma membrane?
Carrier protiens
Are glycoproteins
and allow/help the body’s immune system recognize foreign substances and body cells?
Cell Recognition Protiens
What are shaped so a specific molecules can bind to it?
Receptor Protiens
What carries out specific metabolic reactions directly?
Enzymatic Proteins
What attaches adjacent/animal cells so tissues can function?
Junction Protiens
The plasma membrane is _________ only certain molecules can pass through.
Selectively Permeable
Small non polar molecules such as ________pass through the membrane freely?
Carbon dioxide , oxygen
Small molecules such as _________move “down” a ________, i.e., from high to low concentration.
Carbon dioxide, oxygen/ Concentration gradient
Cells have channel proteins called ______ that allow water to cross a plasma membrane more quickly than expected.
Aquaporins
Ions and charged molecules cannot readily pass through the hydrophobic component of the bilayer and usually combine with _____
carrier proteins.
Large particles enter or exit a cell through _______
bulk transport
_________ or chemical messengers, “talk” to other cells and may change cells, tissues, or organs.
signaling molecules
Once the signaling molecule is bound to a receptor, the signal follows through a _______
Transduction Pathway
The cell’s response to the ________ can change the shape or movement of the cell, alter the metabolism or function of the cell, or alter the gene expression and amount of a cell protein.
transduction pathway
___ is fusion of a vesicle with the plasma membrane moves a particle to outside the membrane
Exoxytosis
_____ is vesicle formation moves a particle to inside the plasma membrane
Endocytosis
A solution consists of ____ and _____
a solvent and a solute