Lipids quiz #2 Flashcards
Lipids quiz #2
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Which of these is not a lipid? Options: A) Cholesterol, B) Glucose, C) Phospholipid, D) Triglyceride
B) Glucose Which of the following is not a function of lipids? Options: A) Energy storage, B) Hormone production, C) Catalyzing reactions, D) Cell membrane structure
C) Catalyzing reactions How do lipids differ from other organic compounds?
Lipids are hydrophobic and do not form polymers like carbohydrates, proteins, and nucleic acids. How are lipids different from carbohydrates?
Lipids are hydrophobic and do not form polymers, while carbohydrates are hydrophilic and form polymers. Which is not true of lipids? Options: A) They are hydrophobic, B) They form polymers, C) They include steroids, D) They are used for energy storage
B) They form polymers Which of the following is a function of the phospholipid molecule?
Phospholipids are essential for forming cell membranes. Which of the following are lipids? Options: A) Proteins, B) Nucleic acids, C) Steroids, D) Carbohydrates
C) Steroids What elements make up lipids?
Lipids are primarily composed of carbon, hydrogen, and oxygen. Which is a main function of lipids?
Lipids are primarily used for long-term energy storage. Which of the following is not a function of fats? Options: A) Insulation, B) Energy storage, C) Enzyme activity, D) Hormone production
C) Enzyme activity Which of the following describes lipids?
Lipids are hydrophobic biomolecules that include fats, oils, phospholipids, steroids, and waxes. Why are phospholipids so important to cells?
Phospholipids are crucial for forming the cell membrane, providing structural integrity and compartmentalization. What elements are found in lipids?
Lipids contain carbon, hydrogen, and oxygen. Which of the following statements is true for lipids? Options: A) They are soluble in water, B) They form polymers, C) They are hydrophobic, D) They are composed of amino acids
C) They are hydrophobic How do fats differ from proteins?
Fats are composed of glycerol and fatty acids, while proteins are composed of amino acids. What type of lipid is shown? Options: A) Phospholipid, B) Steroid, C) Triglyceride, D) Wax
This question requires a visual reference, which is not provided. Which of the following statements is true for the class of biological molecules known as lipids?
Lipids are hydrophobic and do not form polymers. Which of the following is true about fat? Options: A) It is a polymer, B) It is hydrophilic, C) It is used for energy storage, D) It is composed of amino acids
C) It is used for energy storage Which of the following describes the role of lipids?
Lipids play roles in energy storage, cell membrane structure, and hormone production. What makes up cell membranes and is used to create hormones?
Phospholipids make up cell membranes, and steroids are used to create hormones. Which of the following is a known function of a lipid?
Lipids function in energy storage, cell membrane structure, and hormone production. Which of the following is most likely the result of an organism having lipids in its body?
The organism can store energy, maintain cell membrane integrity, and produce hormones. What are lipids and what characteristic do they all share?
Lipids are a diverse group of hydrophobic biomolecules, including fats, oils, phospholipids, steroids, and waxes. They all share the characteristic of being insoluble in water. What are the main types of lipids discussed in biology?
The main types of lipids are fats and oils, phospholipids, steroids, and waxes. What is a fatty acid and what functional group does it contain?
A fatty acid is a hydrocarbon chain of varying length with a carboxylic acid functional group at one end. Why are saturated fatty acids solid at room temperature?
Saturated fatty acids are solid at room temperature because their straight chains allow them to pack tightly together. What are trans fatty acids and how do they differ from other unsaturated fatty acids?
Trans fatty acids are artificial unsaturated fatty acids with double bonds that do not create kinks, resulting in straight chains. Unlike other unsaturated fatty acids, they remain linear and are considered unhealthy. What is the structure of a triglyceride?
A triglyceride consists of three fatty acid chains covalently bonded to a single glycerol molecule. What reaction breaks down triglycerides into their components?
Hydrolysis reactions break down triglycerides into glycerol and fatty acids. What does it mean for a phospholipid to be amphipathic?
Being amphipathic means that a phospholipid has both hydrophilic (water-loving) and hydrophobic (water-fearing) regions. What is the primary biological role of phospholipids?
Phospholipids are the main component of cell membranes. What are steroids and what is their basic structure?
Steroids are lipids characterized by a structure of four fused carbon rings. How do steroids differ from other lipids like fats and phospholipids?
Steroids do not contain fatty acid chains; instead, they have a four-ring carbon structure. What are waxes and what is their primary function?
Waxes are lipids composed of a fatty acid linked to a long-chain alcohol, and they primarily function in protection and prevention of water loss. Why are lipids considered hydrophobic?
Lipids are considered hydrophobic because their molecular structure is dominated by nonpolar hydrocarbon chains, making them insoluble in water. What is dehydration synthesis and how does it relate to lipid formation?
Dehydration synthesis is a chemical reaction that joins molecules by removing water; it links fatty acids to glycerol to form triglycerides and phospholipids. What is the difference between a monomer and a polymer, and why don't lipids form true polymers?
A monomer is a single building block, and a polymer is a long chain of monomers. Lipids do not form true polymers because they lack a consistent monomer and do not form long repeating chains. How do the physical properties of saturated and unsaturated fats affect their function in living organisms?
Saturated fats, being solid at room temperature, are used for energy storage in animals, while unsaturated fats, being liquid, are more common in plant oils and contribute to membrane fluidity. What is the main structural difference between cis and trans unsaturated fatty acids?
Cis unsaturated fatty acids have kinks in their chains due to double bonds, while trans unsaturated fatty acids have straight chains despite double bonds. What is the role of phospholipids in the formation of biological membranes?
Phospholipids form bilayers that make up the structural foundation of biological membranes, providing a barrier and matrix for membrane proteins.
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