Molecular Biology, first lecture quize

What are carbohydrates

• Carbohydrates are organic compounds composed of carbon, and oxygen.

• Carbohydrates are organic compounds composed of carbon, hydrogen, and oxygen.

• Carbohydrates are organic compounds composed of carbon, hydrogen, and nitrogen.

• Carbohydrates are organic compounds composed of carbon only.

D-glucose is also called “fruit sugar”

• True

• False

Fructose is the main sugar in our blood

• True

• False

What is the difference between aldoses and ketoses

• Aldoses have the primary group attached to the first carbon atom, while ketoses have it attached to the 2nd.

• Ketoses have the primary group attached to the first carbon atom, while aldoses have it attached to the 2nd.

• There is no difference between them

• They are Epimers

What are Epimers

• These are sugars which differ only in the configuration around a single carbon atom.

• These are sugars which differ in the configuration around two carbon atoms.

• It is the ability of substance to present in more than one form

• It is when a substance can present in only one form

A polarimeter is a scientific instrument used to measure the angle of rotation caused by passing polarized light through an optically INACTIVE substance.

• True

• False

What is an Asymmetric carbon atom

• It is the carbon atom that is different from other carbon atoms

• It is the carbon atom to which two different groups or atoms are attached.

• It is the carbon atom to which four similar groups or atoms are attached.

• It is the carbon atom to which four different groups or atoms are attached.

Most physiologically important isomers that can be utilized in the body are the L form

• True

• False

How many carbon atoms does pentoses have

• 5

• 4

• 3

• 2