Which of the following statements is NOT TRUE about tyrosine? O It is an essential amino acid. O It contains a hydroxyl group. O It contains three ionizable groups. O It has an aromatic group.
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- What type of intermolecular forces exists between the side chains of each of the following pairs of amino acids? serine and threonine isoleucine and valine arginine and aspartic acid cysteine and cysteineWhich of the followings are sulfur-containing amino acids? O Serine and Threonine O Glutamate and Aspartate O Cysteine and Methionine Arginine and Histidine Glycine and AlanineWhich of the following amino acids undergoes phosphorylation? Histidine Glutamic Acid (Glutamate) Serine Isoleucine
- Which of the following is not true about cholesterol? O Amphipathic in nature Found in bacterial membranes O Precursor of steroid hormones O Structure has four fused ringsWhich of the following pairs of amino acids can have intermolecular hydrogen bonding between the functional groups in their side chains? Select all that apply. phenylalanine and tyrosine two tyrosine residues serine and threonine alanine and threonineWhich of the following is true of sphingolipids? They always contain glycerol and fatty acids. They may be charged, but are never amphipathic. They contain two esterified fatty acids. Phosphatidylcholine is a typical sphingolipid. The sphingosine backbone is O-linked to a head group.
- Which of the following group is present in thymine but absent in uracil? NH3 COOH C=O OCH3 CH3Which of the following pairs of molecules form the pyrimidine ring?a. Glutamate and carbamoyl phosphateb. Aspartate and glutaminec. Aspartate and carbamoyl phosphated. Glycine and carbamoyl phosphateWhich of the following amino acids are involved in O-glycosylation linkage? O Tyrosine O Asparagine and Mannose O Serine and Threonine O Aspartate and Glutamate
- As a substituent, the hydrocarbon “tail” of the Ibuprofen molecule (see circle above) can be best described as n-butyl.  sec-butyl. isobutyl. tert-butylWhich of the following bonds (labeled by arrows A-H) will be cleaved by trypsin? Group of answer choices G D E A H F B CWhich of the following is NOT a naturally-occurring amino acid?