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Glycine, often abbreviated as Gly or G, is the smallest amino acid found in proteins, with a side chain consisting of a single hydrogen atom. Its chemical structure is NH2CH2COOH, and its codons in the genetic code are GGU, GGC, GGA, and GGG.

1. Nucleotides in nucleic acids are linked by phosphodiester bonds.
2. The bacterium Agrobacterium tumefaciens transfers t-DNA into plants.
3. Agrobacterium tumefaciens is a soil microorganism capable of infecting plants, transferring specific DNA sequences into plant cells, and causing crown gall disease. This bacterium contains a Ti (tumor-inducing) plasmid ranging from 140–235 kb in size.
4. Chitin, also known as fungal cellulose, is a nitrogen-rich polysaccharide and a heteropolymer of N-acetylglucosamine (NAG).

Correct answer: Chitin, also known as fungal cellulose, is a nitrogen-rich polysaccharide and a heteropolymer of N-acetylglucosamine (NAG).

Solution

Option D is correct because chitin is a nitrogen-containing polysaccharide made of N-acetylglucosamine (NAG) units, which is a heteropolymer. The other options are unrelated to the question's focus on glycine and amino acids.

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