Which statements below are false? ) (a) Antiparallel ß sheets are more common in proteins than parallel ß sheets. (b) Antiparallel ß sheets have less optimal hydrogen bonding than parallel 3 sheets (c) Parallel ß sheets are more common in proteins than antiparallel ß sheets. (d) Parallel ß sheets have less optimal hydrogen bonding than antiparallel B sheets
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- 1.One of the main sources of sphingosine in the body is in the cell membrane. What complication could arise from the biological synthesis of ceramide?5. All antibodies are proteins. What protein property has favored their use as antibodies in preference to some other type of biomolecule?1. What is the distinguishing structural feature of O-glycans? 2. What other prominent class of glycoproteins besides mucins is known for the presence of O-linked glycans?
- 3. How many amino acids are there in the polypeptide (protein)?1.Which of the following is not an example of a protein with quaternary structure? a. Calmodulin is a Ca2+-binding protein which is formed by two identical subunits. b. Hemoglobin in adult humans has the composition αα2ββ2. c. The photosynthetic enzyme Rubisco is composed of 8 L subunits and 8 S subunits. d. Myoglobin, an oxygen-binding protein in muscle, consists of a single subunit. e. South American rattlesnake toxin (crotoxin) is a phospholipase A enzyme with two different subunits. 2.Complete the sentence with the best option provided below. The secondary structures of a protein are the a. chemical modifications of amino acid side chains. b. temporary, unstable protein folding conformations. c. regular, repeated folds present in a lowest energy conformation. d. interactions between polar amino acid side chains.1. Which type of proteins are also known as denatured proteins? A. Primary proteins B. Secondary proteins C. Conjugated proteins D. None of the above 2. High density lipoproteins is an example of which kind of protein? A. Regulatory proteins B. Conjugated proteins C. derived proteins E. none of the above
- 7/ Hemoglobin is an example of a protein with A. Primary structure only. B. two protein chains held together. C. a quaternary structure. D. primarily a B-pleated sheet structure.1. what is the reason why lactose is considered to have the least sweet taste from all other kinds of carbohydrates? 2. Why monosaccharides have the sweetest taste from all carbohydrates ? 3. Why polysaccharides have the least sweet from all other carbohydrates?1. The chromatography solvent is very polar as it contains alcohol, an acid and water. Based on this information, list all the polar amino acids and arrange them from most polar to least polar.
- 1. Why is cholesterol an important steroid?2 If a protein is predominantly made up of aliphatic and aromatic amino acids, which of the following is most likely true about such protein? Select the correct responses): a. It is a protein with a net negative charge b. It is most probably a structural protein. c. It is a protein that is cationic in nature. d. It is a protein that is hydrophobic in nature. e. It is most probably a catalytic protein. f. It is a water-solube protein. g. It is most probably a carrier protein.1. Which of these disaccharides are 'reducing'?