Biochem Mix

33 flashcardsby Ash
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1
A zwitterion ________________.
  • a. Has a positive charge
  • b. Has a negative charge
  • c. Overall, has no charge
  • d. All of the above
2
All 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
3
Essential amino acids:
  • a. Are made by organisms
  • b. Must be obtained from dietary sources
  • c. Are made from DNA
  • d. Include proline
4
The first reaction of amino acid degradation is?
  • a. Deamination
  • b. Decarboxylation
  • c. Cyclization
  • d. None of the above
5
The 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
9
Nonessential amino acids are:
  • a. Provided in the diet
  • b. Synthesized by mammals
  • c. Both A and B
  • d. None of the above
10
A(n) _________ is a short protein tag that attaches to and targets proteins for degradation.
  • a. Peptide
  • b. Ubiquitin
  • c. Alanine
  • d. Urea
11
Protein synthesis is carried out by __________.
  • a. Mitochondria
  • b. Chromosomes
  • c. Ribosomes
  • d. Lysosomes
12
The amino acid _______ places certain constraints on the protein backbone.
  • a. Leucine
  • b. Alanine
  • c. Proline
  • d. Glycine
13
The difference between a peptide and a protein is ____________.
  • a. Length
  • b. Bond formation
  • c. Subunits
  • d. All of the above
14
The formation of a dimer refers to a protein's ___________.
  • a. Primary structure
  • b. Tertiary structure
  • c. Secondary structure
  • d. None of the above
15
The tertiary structure of a protein refers to its __________.
  • a. Overall 3D shape
  • b. Multisubunit composition
  • c. Amino acid sequence
  • d. None of the above
16
The ______ 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
18
Amino acids are linked by a(n) _______ bond to form a protein.
  • a. Hydrophobic
  • b. Peptide
  • c. Ionic
  • d. All of the above
19
Carbohydrates are also known as ____________.
  • a. Sugars
  • b. Starches
  • c. Fats
  • d. A and B
20
Carbohydrates are commonly used as ___________.
  • a. A source of energy
  • b. An amino acid source
  • c. A source of nitrogen
  • d. None of the abov
21
Disaccharides are formed by ______________.
  • a. The condensation of two monosaccharides
  • b. Hydrolysis of a polysaccharide
  • c. Both A and B
  • d. Neither A or B
22
In animals, the process of gluconeogenesis occurs in the __________.
  • a. Fat
  • b. Liver
  • c. Spleen
  • d. Gall bladder
23
Starch is an example of a ___________.
  • a. Monosaccharide
  • b. Disaccharide
  • c. Polysaccharide
  • d. Trisaccharide
24
Sucrose, aka table sugar, is composed of ____________.
  • a. Glucose
  • b. Fructose
  • c. Both A and B
  • d. Neither A or B
25
Fatty 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
26
Glycerolphospholipids 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
27
Lipids are the starting material of important biological molecules, including ___________.
  • a. Steroids
  • b. DNA
  • c. Carbohydrates
  • d. All of the above
28
Lipids play a role in which of the following?
  • a. Energy storage
  • b. Membrane structure
  • c. Cell signaling
  • d. All of the above
29
Phospholipids can be composed of _______________.
  • a. Fatty acids
  • b. Glycerol
  • c. Sphingomyelin
  • d. All of the above
30
The 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
31
The 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
32
Triacylglycerol is composed of ___________.
  • a. Glycerol and fatty acids
  • b. Glycerol and long chain alcohols
  • c. Glycerol and cholesterol
  • d. None of the above
33
Which of the following are composed of lipids?
  • a. Waxes
  • b. Cholesterol
  • c. Triacylglecerols
  • d. All of the above
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