D-Glucose and L-Glucose Concepts

The video tutorial by Malinki on the 'Voice of Malinki' channel discusses D and L isomers, focusing on their nature as mirror images. It explains the concept using examples of glyceraldehyde and glucose, highlighting the role of chiral carbons. The tutorial also covers the optical activity of these isomers and their occurrence in nature, emphasizing that D-glucose is naturally found in the body, while L-glucose is not. The video concludes with insights into why enzymes in the body only act on D-glucose.

What are D and L isomers primarily considered as?

• Mirror images of each other

• Identical compounds

• Different elements

• Non-reactive substances

What defines a chiral carbon?

• A carbon with no bonds

• A carbon with two identical groups

• A carbon with four different groups

• A carbon with four identical groups

In D-glyceraldehyde, where is the OH group located?

• On the left side

• On the right side

• Below the carbon

• Above the carbon

Which carbon numbers in glucose are chiral?

• Carbon 1, 2, and 3

• Carbon 2, 3, 4, and 5

• Carbon 1 and 6

• Carbon 5 and 6

What is the main difference in configuration between D-glucose and L-glucose?

• The number of carbon atoms

• The position of OH and H groups

• The presence of nitrogen

• The type of bonds

How does D-glucose rotate polarized light?

• To the left, counterclockwise

• To the right, clockwise

• Does not rotate light

• To the right, counterclockwise

Which form of glucose is naturally found in the human body?

• D-glucose

• L-glucose

• Both D and L-glucose

• Neither D nor L-glucose

Why can't hexokinase act on L-glucose?

• L-glucose is too large

• L-glucose is not recognized by the enzyme

• L-glucose is not present in the body

• L-glucose is too reactive

What is the role of hexokinase in the body?

• To store energy

• To break down D-glucose

• To synthesize proteins

• To transport oxygen

Which enzyme is crucial for the glycolysis pathway?

• Protease

• Lipase

• Hexokinase

• Amylase