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Questions and Answers
What is the role of kinks in the tails of phospholipids in the plasma membrane?
What is the role of kinks in the tails of phospholipids in the plasma membrane?
- They increase the permeability of the membrane to ions
- They provide a barrier to the entry of water
- They keep the plasma membrane fluid across a range of temperatures (correct)
- They help to regulate the movement of proteins within the membrane
What is the characteristic feature of steroids?
What is the characteristic feature of steroids?
- They contain four fused carbon rings (correct)
- They are composed of a single carbon ring
- They have a long chain of fatty acids attached to a glycerol backbone
- They have a polar head and a nonpolar tail
What is the function of cholesterol in the cell membrane?
What is the function of cholesterol in the cell membrane?
- It is a precursor molecule for the synthesis of other steroids
- It provides a barrier to the entry of water
- It helps to regulate the movement of proteins within the membrane
- It is a component of the cell membrane, providing structural support and regulating fluidity (correct)
What is the characteristic of the functional groups attached to the carbon skeleton of steroids?
What is the characteristic of the functional groups attached to the carbon skeleton of steroids?
What is the relationship between testosterone and estrogen?
What is the relationship between testosterone and estrogen?
What is the main difference between saturated and unsaturated fatty acids?
What is the main difference between saturated and unsaturated fatty acids?
What is the characteristic of most membrane lipids?
What is the characteristic of most membrane lipids?
What is the primary function of lipids in cell membranes?
What is the primary function of lipids in cell membranes?
Which type of lipid is commonly found in biological membranes?
Which type of lipid is commonly found in biological membranes?
What is the main characteristic of fatty acids in terms of their carbon atom number?
What is the main characteristic of fatty acids in terms of their carbon atom number?
What is the primary force driving the formation of lipid bilayers?
What is the primary force driving the formation of lipid bilayers?
Which type of fatty acids are more likely to make a membrane more fluid?
Which type of fatty acids are more likely to make a membrane more fluid?
What is a characteristic of animal membranes that is not typical of plant membranes?
What is a characteristic of animal membranes that is not typical of plant membranes?
What is the term used to describe the difference in lipid composition between the inner and outer layers of a lipid bilayer?
What is the term used to describe the difference in lipid composition between the inner and outer layers of a lipid bilayer?
Which type of cell membranes are the most fluid?
Which type of cell membranes are the most fluid?
What is the primary function of cholesterol in biological membranes?
What is the primary function of cholesterol in biological membranes?
Which type of membrane protein is associated with one side of the membrane and bound by electrostatic interactions?
Which type of membrane protein is associated with one side of the membrane and bound by electrostatic interactions?
What is the characteristic of the lipid bilayer structure in the fluid mosaic model of biological membranes?
What is the characteristic of the lipid bilayer structure in the fluid mosaic model of biological membranes?
What is the difference between integral and peripheral membrane proteins in terms of their binding to the membrane?
What is the difference between integral and peripheral membrane proteins in terms of their binding to the membrane?
What is the characteristic of the fluidity of biological membranes in the fluid mosaic model?
What is the characteristic of the fluidity of biological membranes in the fluid mosaic model?
Which type of protein is rhodopsin?
Which type of protein is rhodopsin?
What is the primary source of energy for primary active transport?
What is the primary source of energy for primary active transport?
What is the primary difference between saturated and unsaturated fatty acids?
What is the primary difference between saturated and unsaturated fatty acids?
In which type of transport is a molecule or ion carried across the membrane by a carrier/channel protein?
In which type of transport is a molecule or ion carried across the membrane by a carrier/channel protein?
What is the arrangement of phospholipids in a lipid bilayer?
What is the arrangement of phospholipids in a lipid bilayer?
What is the role of the modified phosphate group in a phospholipid?
What is the role of the modified phosphate group in a phospholipid?
What is the driving force behind secondary active transport?
What is the driving force behind secondary active transport?
What is the result of the binding of Na+ ions to the enzyme in the Na+/K+ ATPase mechanism?
What is the result of the binding of Na+ ions to the enzyme in the Na+/K+ ATPase mechanism?
What is the function of phospholipids in cells?
What is the function of phospholipids in cells?
What is a characteristic of triglycerides?
What is a characteristic of triglycerides?
What is the primary function of HDL cholesterol in the bloodstream?
What is the primary function of HDL cholesterol in the bloodstream?
What is the consequence of high levels of LDL cholesterol in the bloodstream?
What is the consequence of high levels of LDL cholesterol in the bloodstream?
What is the primary characteristic of lipids in an aqueous environment?
What is the primary characteristic of lipids in an aqueous environment?
What is the relationship between lipid bilayers and biological membranes?
What is the relationship between lipid bilayers and biological membranes?
What is the role of the liver in HDL cholesterol function?
What is the role of the liver in HDL cholesterol function?
What is the effect of high levels of HDL cholesterol on the risk of heart disease and stroke?
What is the effect of high levels of HDL cholesterol on the risk of heart disease and stroke?
What is the primary function of lipoproteins in the bloodstream?
What is the primary function of lipoproteins in the bloodstream?
What is the consequence of high levels of LDL cholesterol in the arteries?
What is the consequence of high levels of LDL cholesterol in the arteries?
What is the relationship between lipoproteins and cholesterol in the bloodstream?
What is the relationship between lipoproteins and cholesterol in the bloodstream?
What is the primary characteristic of HDL cholesterol?
What is the primary characteristic of HDL cholesterol?
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