1A zwitterion ________________.
- a. Has a positive charge
- b. Has a negative charge
- c. Overall, has no charge
- d. All of the above
2All amino acids contain both a(n) ______ and a(n) ________ group.
- a. Hydrogen, carbohydrate
- b. Amine, carboxylic acid
- c. Sulfur, amine
- d. None of the above
3Essential amino acids:
- a. Are made by organisms
- b. Must be obtained from dietary sources
- c. Are made from DNA
- d. Include proline
4The first reaction of amino acid degradation is?
- a. Deamination
- b. Decarboxylation
- c. Cyclization
- d. None of the above
5The only amino acid without a chiral center is _____________.
- a. Proline
- b. Methionine
- c. Alanine
- d. Glycine
6______ is the initiating amino acid of most newly synthesized proteins.
- a. Proline
- b. Alanine
- c. Glycine
- d. Methionine
7_____________ is an example of a hydrophilic amino acid.
- a. Lysine
- b. Leucine
- c. Methionine
- d. Tryptophan
8_____________ is an example of a hydrophobic amino acid.
- a. Glutamic acid
- b. Lysine
- c. Arginine
- d. Leucine
9Nonessential amino acids are:
- a. Provided in the diet
- b. Synthesized by mammals
- c. Both A and B
- d. None of the above
10A(n) _________ is a short protein tag that attaches to and targets proteins for degradation.
- a. Peptide
- b. Ubiquitin
- c. Alanine
- d. Urea
11Protein synthesis is carried out by __________.
- a. Mitochondria
- b. Chromosomes
- c. Ribosomes
- d. Lysosomes
12The amino acid _______ places certain constraints on the protein backbone.
- a. Leucine
- b. Alanine
- c. Proline
- d. Glycine
13The difference between a peptide and a protein is ____________.
- a. Length
- b. Bond formation
- c. Subunits
- d. All of the above
14The formation of a dimer refers to a protein's ___________.
- a. Primary structure
- b. Tertiary structure
- c. Secondary structure
- d. None of the above
15The tertiary structure of a protein refers to its __________.
- a. Overall 3D shape
- b. Multisubunit composition
- c. Amino acid sequence
- d. None of the above
16The ______ carries out protein degradation.
- a. Proteosome
- b. Lysosome
- c. Ribosome
- d. Chromosome
17________ aid in protein folding.
- a. Chromosomes
- b. Chaperones
- c. Proteosome
- d. None of the above
18Amino acids are linked by a(n) _______ bond to form a protein.
- a. Hydrophobic
- b. Peptide
- c. Ionic
- d. All of the above
19Carbohydrates are also known as ____________.
- a. Sugars
- b. Starches
- c. Fats
- d. A and B
20Carbohydrates are commonly used as ___________.
- a. A source of energy
- b. An amino acid source
- c. A source of nitrogen
- d. None of the abov
21Disaccharides are formed by ______________.
- a. The condensation of two monosaccharides
- b. Hydrolysis of a polysaccharide
- c. Both A and B
- d. Neither A or B
22In animals, the process of gluconeogenesis occurs in the __________.
- a. Fat
- b. Liver
- c. Spleen
- d. Gall bladder
23Starch is an example of a ___________.
- a. Monosaccharide
- b. Disaccharide
- c. Polysaccharide
- d. Trisaccharide
24Sucrose, aka table sugar, is composed of ____________.
- a. Glucose
- b. Fructose
- c. Both A and B
- d. Neither A or B
25Fatty acids contain ________________.
- a. A carboxyl group and hydrocarbon chain
- b. A phosphate group and hydrocarbon chain
- c. A sugar group and hydrocarbon chain
- d. Only a hydrocarbon chain
26Glycerolphospholipids create a double layer lipid membrane, such as the cell membrane, because of _____________.
- a. Their high energy phospho group
- b. Their hydrophilic heads and hydrophobic tails
- c. Their unsaturated tails
- d. Their ability to covalently bond to each other
27Lipids are the starting material of important biological molecules, including ___________.
- a. Steroids
- b. DNA
- c. Carbohydrates
- d. All of the above
28Lipids play a role in which of the following?
- a. Energy storage
- b. Membrane structure
- c. Cell signaling
- d. All of the above
29Phospholipids can be composed of _______________.
- a. Fatty acids
- b. Glycerol
- c. Sphingomyelin
- d. All of the above
30The difference between saturated and unsaturated fatty acids is ______________.
- a. The number of hydrocarbon chains
- b. The length of the hydrocarbon chain
- c. The presence of single or double bonds in the hydrocarbon chain
- d. All of the above
31The fluidity of the cell membrane is determined by ___________.
- a. The lipid content
- b. The amount of cholesterol present
- c. The number of saturated and unsaturated fatty acids present
- d. All of the above
32Triacylglycerol is composed of ___________.
- a. Glycerol and fatty acids
- b. Glycerol and long chain alcohols
- c. Glycerol and cholesterol
- d. None of the above
33Which of the following are composed of lipids?
- a. Waxes
- b. Cholesterol
- c. Triacylglecerols
- d. All of the above