Amino acid General Structure and information

Trp is a three letter abbreviation for

• tyrosine

• threonine

• tryptophan

• trypsin

the simplest amino acid is

• Alanine

• Glycine

• Valine

• Proline

The first amino acid of any polypeptide chain in eukaryotes is

• Alanine

• Valine

• Glycine

• Methionine

The naturally occurring proteins consist of

• a) D- amino acids

• b) L-amino acids

• c) Both a & b

• d) None of these

which of the following is an imino acid

• Glycine

• Lysine

• Methionine

• Proline

- Choose the incorrect statement out of the followings

• Only L amino acids are found in the biological system

• Glycine is optical inactive

• Selenocysteine is 21 st amino acid

• Tyrosine is a modified amino acid

Proteins are predominantly constituted by which five major elements?

• C, H,O, N & P

• C, H, O, N & Fe

• C, O, H , N & S

• C, O ,N , H & I

Are these statements about amino acids true or false?

Amino acids undergo addition polymerisation to form polypeptides

• true

• false

What's the correct definition of these keywords?

zwitterions

• Amino acid molecules with a negative charge on the amine group in the form of COO- and a positive charge on the carboxylic acid group in the form of NH3+

• Amino acid molecules with a positive charge on the amine group in the form of NH3+ and a negative charge on the carboxylic acid group in the form of COO-
  

• Amino acid molecules with a negative charge on the amine group in the form of NH3- and a positive charge on the carboxylic acid group in the form of COO+

Which of these structures is a zwitterion?

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