Moderate

Amino acids in proteins are held together by _ ?

Correct answer: A. Peptide bond

  • A. Peptide bond
  • B. Phosphodiester linkage
  • C. H-bonding
  • D. Ether linkage

Explanation

The amino acids in proteins are held together by covalent peptide bonds, which are formed through a condensation reaction between the carboxyl group (-COOH) of one amino acid and the amino group (-NH2) of another amino acid, with the elimination of a water molecule. Phosphodiester linkage refers to the covalent bond that connects the 3' carbon atom of one nucleotide to the 5' carbon atom of another nucleotide in DNA and RNA molecules. Hydrogen bonding is a type of noncovalent bond that occurs between a hydrogen atom covalently bonded to an electronegative atom (usually nitrogen, oxygen, or fluorine) and another electronegative atom in a different molecule or within the same molecule An ether linkage refers to the covalent bond that connects an oxygen atom to two alkyl or aryl groups in an ether molecule. The oxygen atom is covalently bonded to each alkyl or aryl group via a single bond, resulting in an oxygen atom with two unshared pairs of electrons.

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About Biological Molecules

The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.

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