Ketoses and Chirality Quiz

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Which designation is based on the configuration about the single asymmetric C in glyceraldehyde?

D

R

L (correct)

S

What type of isomerism is found in pairs of structures that are mirror images of each other?

Cis-trans isomerism

Structural isomerism

Geometric isomerism

Enantiomerism (correct)

How many stereoisomers are possible for a compound with four chiral centers?

32

4

16 (correct)

8

When fructose reacts to form a 6-member ring, which group reacts with the OH on C6?

C2 keto group Signup and view all the answers

What do we call stereoisomers that differ only in configuration around one chiral center?

Epimers Signup and view all the answers

What is the term for the 6-membered pyranose ring formed by D-glucose?

Pyranose ring Signup and view all the answers

Which individual proposed the D & L designations for sugars?

Emil Fischer Signup and view all the answers

In which form of glucose do the hydroxyl groups at C1 and C5 react to form an intramolecular hemiacetal?

Linear form Signup and view all the answers

Which type of representation shows a simple ring in perspective for cyclic sugars like glucose?

Haworth projection Signup and view all the answers

What is the term for the removal of oxygen from the hydroxyl group to form sugars like deoxyribose?

Dehydration Signup and view all the answers

Which type of optical activity is exhibited if a sugar solution turns the plane of polarized light to the right?

Dextrorotatory (+) Signup and view all the answers

How many carbon atoms are present in monosaccharides like glucose, fructose, and galactose?

6 Signup and view all the answers

What is the main difference between amylose and amylopectin?

Amylose is a linear structure, while amylopectin is highly branched Signup and view all the answers

Which statement is true about glycogen?

Glycogen has more alpha(1->6) branches compared to amylopectin Signup and view all the answers

What is the significance of the branches in amylopectin and glycogen?

The branches provide compact structures and multiple chain ends for enzymatic cleavage Signup and view all the answers

Which is an accurate statement regarding starch?

Starch consists of 80% amylose and 20% amylopectin Signup and view all the answers

What are the main differences between glycogen and cellulose?

Glycogen stores glucose for quick release, while cellulose provides structural support in plant cell walls Signup and view all the answers

Which type of linkage forms the branches in amylopectin?

Alpha(1->6) Signup and view all the answers

What is sucrose hydrolyzed into?

Glucose and fructose Signup and view all the answers

Which polysaccharide is the most common storage polysaccharide in plants?

Starch Signup and view all the answers

What type of linkages does amylose have?

α(14) linkages Signup and view all the answers

What is the end of the polysaccharide called?

The reducing end Signup and view all the answers

What are the two forms of starch?

Amylose and amylopectin Signup and view all the answers

How do plants store glucose in polymeric form?

As amylose or amylopectin Signup and view all the answers

Which of the following statements is true about ketoses?

Ketoses have a keto group at C2. Signup and view all the answers

What is the definition of a chiral center?

A carbon atom bonded to four different atoms. Signup and view all the answers

How many stereoisomers are there for 6-C aldoses?

16 Signup and view all the answers

What is Van't Hoff's rule?

The possible isomers of a given compound is determined by the number of asymmetric carbon atoms. Signup and view all the answers

What is the difference between D and L sugars?

D and L sugars are enantiomers. Signup and view all the answers

What does the reference C atom refer to?

The C atom next to the last C atom, around which mirror images are formed. Signup and view all the answers