Consider the following statements: (1) In proteins, only right handed helices are observed. (2) In a polysaccharide chain, the right end is called the reducing end. (3) B-DNA is generally coiled in left handed fashion. Which of the statement(s) given above is/are incorrect?

Question

Consider the following statements: (1) In proteins, only right handed helices are observed. (2) In a polysaccharide chain, the right end is called the reducing end. (3) B-DNA is generally coiled in left handed fashion. Which of the statement(s) given above is/are incorrect? (A) (3) only (B) (1) and (3) only (C) (2) and (3) only (D) (1) and (2) only

Tardigrade Admin · Accepted Answer

• In a polysaccharide chain, the right end is called the reducing end and the left end is called the non-reducing end.
• In proteins, only right handed helices are observed.
• The familiar Watson-Crick double helix of DNA, called B-DNA, winds in a right-handed direction. But like a screw, the helix can wind the other way: under certain conditions,
DNA adopts a left-handed form, called Z-DNA.

Q. Consider the following statements: (1) In proteins, only right handed helices are observed. (2) In a polysaccharide chain, the right end is called the reducing end. (3) B-DNA is generally coiled in left handed fashion. Which of the statement(s) given above is/are incorrect?

(3) only

(1) and (3) only

(2) and (3) only

(1) and (2) only

Q. Consider the following statements:
(1) In proteins, only right handed helices are observed.
(2) In a polysaccharide chain, the right end is called the reducing end.
(3) B-DNA is generally coiled in left handed fashion.
Which of the statement(s) given above is/are incorrect?