15 Questions
What type of transport does not require an input of energy and may involve transport proteins?
Passive transport
What type of molecules are phospholipids?
Hydrophobic
According to the text, what are the main components of cellular membranes?
Lipids and proteins
What is the main role of phospholipids in the cell membrane?
To create a bilayer with hydrophobic tails and hydrophilic heads
Which type of transport requires both energy and a transport protein?
Active transport
What process involves the movement of large molecules through the cell membrane using bulk transport mechanisms?
Endocytosis
What is the effect of cholesterol on membrane fluidity at warm temperatures?
It restrains the movement of phospholipids
What primarily holds membranes together?
Weak hydrophobic interactions
In what conditions do membranes switch from a fluid state to a solid state?
At low temperatures
What is the role of proteins in the cell membrane?
To determine most of the membrane's functions
Which lipid component contributes to membrane fluidity?
Unsaturated fatty acids
What is the primary orientation of hydrophilic regions of membrane proteins?
Toward the cytosol and extracellular fluid
What effect do unsaturated phospholipids have on membrane composition during winter in organisms?
They prevent membrane solidification during winter
What is the main role of cholesterol in animal cell membranes at cool temperatures?
To prevent membrane solidification
What are membranes mainly composed of?
Lipid bilayers with amphipathic proteins
Test your knowledge of the regulation of inbound and outbound traffic through the plasma membrane in Chapter 3 of the textbook 'Campbell Biology'. Explore the movement of small molecules using passive and active transport mechanisms.
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