AP Biology : Biochemical Concepts
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Example Questions
Example Question #23 : Identify Structure And Purpose Of Carbohydrates, Lipids, Proteins, And Nucleic Acids
Lipids consist mostly of __________.
oxygen
glycogen
hydrocarbons
amino acids
hydrocarbons
Lipids are mostly made up of hydrocarbons, which makes them nonpolar and thus, hydrophobic. Glycogen is a type of carbohydrate; it is the storage form of glucose in animals. Amino acids are the monomeric units of polypeptides.
Example Question #22 : Identify Structure And Purpose Of Carbohydrates, Lipids, Proteins, And Nucleic Acids
An important trait that all lipids share is __________.
hydrophilicity
basicity
hydrophobicity
solubility
acidity
hydrophobicity
Because lipids are made mostly of hydrocarbons, they are nonpolar and thus hydrophobic, which means they avoid contact with water. The root "hydro" refers to water and the root "phobic" refers to fear. Hence hydrophobic means "water fearing". Hydrophilic on the other hand means "water loving" and is used to describe polar molecules.
Example Question #23 : Identify Structure And Purpose Of Carbohydrates, Lipids, Proteins, And Nucleic Acids
Which of the following is not an example of lipid(s)?
Phospholipids
Glycogen
Oils
Fatty acids
Glycogen
Glycogen is a carbohydrate. It is a polysaccharide that animals use to store glucose when sugars are needed by the body for fuel. All other answer choices are lipids.
Example Question #61 : Macromolecules
Which of the following is not an example of lipid(s)?
Fructose
Waxes
Triglycerides
Testosterone
Fructose
Monosaccharides such as fructose are carbohydrates not lipids. Waxes, steroid hormones such as testosterone, estrogen and progesterone, and triglycerides (fats) are composed mainly of hydrocarbons and are classified as lipids.
Example Question #26 : Identify Structure And Purpose Of Carbohydrates, Lipids, Proteins, And Nucleic Acids
Chitin is what class of molecule?
Lipid
Wax
Nucleic acid
Carbohydrate
Carbohydrate
Chitin is a carbohydrate. Specifically, it is a polysaccharide used by arthopods to build exoskeletons, and is found in the cell walls of fungi. Waxes are types of lipids, and nucleic acids are DNA and RNA.
Example Question #26 : Identify Structure And Purpose Of Carbohydrates, Lipids, Proteins, And Nucleic Acids
Starch belongs to which class of macromolecules?
Polypeptides
Lipids
Nucleic acids
Carbohydrates
Carbohydrates
Starch is a carbohydrate. Specifically, it is a polysaccharide carbohydrate used in plants. The enzyme amylase breaks down starch in the mouth and small intestine, where it can is absorbed as monosaccharides and disaccharides.
Example Question #63 : Macromolecules
Which of the following is an example of a lipid?
Disaccharide
Cholesterol
Cellulose
Amino acid
Cholesterol
Cholesterol is a type of steroid, which is a lipid. Amino acids are part of proteins. Cellulose and disaccharides are examples of carbohydrates.
Example Question #63 : Macromolecules
Which of the following includes all the other answer choices?
Fats
Waxes
Phospholipids
Lipids
Lipids
Lipids are a large class of hydrocarbon-based molecules that includes waxes, steroids, phospholipids and fats. Lipids are hydrophobic and have functions in energy storage, providing support to the cell/organism, cell signaling, and make up the majority of the cell membrane.
Example Question #31 : Identify Structure And Purpose Of Carbohydrates, Lipids, Proteins, And Nucleic Acids
A lipid that consists of a long chain of hydrocarbons with the maximum number of hydrogens possible is referred to as __________.
a vitamin
a triglyceride
a steroid
a saturated fatty acid
a saturated fatty acid
Saturated fatty acids contain the maximum number of hydrogens on their hydrocarbon tails. These molecules form long, straight chains that can be very densely packed. By contrast, unsaturated fatty acids, do not contain the maximum number of hydrogens on their hydrocarbon tails, and thus have "kinks" in their tails. This does not allow for dense packing and storage of unsaturated fatty acids, and thus make them easier to burn.
Example Question #32 : Identify Structure And Purpose Of Carbohydrates, Lipids, Proteins, And Nucleic Acids
Hemoglobin is an example of a __________.
steroid
protein
nucleic acid
phospholipid
protein
Hemoglobin is the protein in red blood cells that binds and transports oxygen to the body tissues. It contains an iron core, and each hemoglobin molecule can bind up to four oxygen molecules.
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