Which of the following statements about monosaccharides is correct ? P – Epimers of monosaccharides differ in chemical properties. Q – In aldoses, C1 is the anomeric carbon. R – Anomers differ in configuration at the glycosidic carbon. S – Epimers differ in configuration at any carbon other than glycosidic carbon.
P, Q, R and S
Epimers are sugars that differ in configuration at only one chiral carbon, for example D-glucose and D-galactose (C-4) or D-glucose and D-mannose (C-2). They are diastereomers, not mirror images, so they have different physical and chemical properties. Statement P is correct.
When an aldose cyclizes, the aldehyde carbon C-1 reacts with a hydroxyl group to form a hemiacetal and becomes a new chiral centre, the anomeric carbon. Statement Q is correct (in ketoses such as fructose the anomeric carbon is C-2).
The α and β anomers differ only in the configuration of the hydroxyl group on this anomeric carbon, which is the carbon that forms glycosidic bonds. Statement R is correct.
Epimers, in contrast, differ in configuration at one carbon other than the anomeric (glycosidic) carbon. Statement S is correct.
Since P, Q, R and S are all correct, every combination that leaves any of them out is incomplete.
Hence, P, Q, R and S.
Similar Questions
DNA is supercoiled state can be relaxed by an enzymatic process. Which enzyme catalyses relaxation of supercoiled DNA?
Adaptive radiation produced numerous lineages from reptiles during chordate evolution. One of the following gave rise to mammals:
Which one produces highest isotope effect?
Which one of the following conditions is true for parthenogenesis?
The urge to inhale in human being results from:
Which of the following is responsible for triggering formation of other enzymes?
Which of the following is critical for differentiation of bipotential gonads towards ovarian pathway?
The PCR technique that allows measuring of DNA amplification at each cycle of PCR rather than the end point detection is:
Abscisic acid responsive elements (ABREs) are over-represented in promoter of genes involved in ............
In humans pointed eyebrows are dominant over smooth eyebrows and downward pointed frontal hairline is dominant over continuous hairline. What phenotypic ratio would you expect in the offspring from a cross between an individual heterozygous for both genes and an individual homozygous recessive for both genes?
Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
