Chapter 7- Carbohydradrates and Glycobiology Flashcards

1
Q

  1. 2.
A
  1. Aldose 2. Ketone
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2
Q
A

D-Glyceraldehyde

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3
Q
A

L-Glyceraldehyde

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4
Q
A

D-Glucose

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5
Q
A

D-Fructose

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6
Q
A

D-ribose

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7
Q
A

D-Erythrose

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8
Q
A

D-Mannose

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9
Q
A

2-deoxy-D-ribose

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10
Q
A

D-Galactose

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11
Q

What are Carbohydrates?

A
  • Named because Cn(H2O)n
  • Produced from CO2 and H20 via photosynthesis in plants.
  • Polyhydroxy aldehydes or ketones that yield such as compounds on hydrolysis.
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12
Q

What are carbohydrates function ?

A
  • INFOMATIONAL MOLECUES IN CELL-CELL SIGNALING !
  • Energy source
  • structural component of cell walls and exoskeletons.
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13
Q
  • What are Glycoconjugates ?
A

Complex carbohydrates polymer covalently attached to proteins or lipids act as signals that determine the intracellular destination or metabolic fate of these hybrid molecules.

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14
Q
  • What are the most famous Hexoses and why are they so important ?
A
  • D-glucose (aldohexose) and D-fructose (ketohexose) are the most common monosaccharides in nature. The product of photosynthesis and key intermediates in the central energy yielding reaction sequence in most organisms.
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15
Q

What are Enantiomers ?

Which is the only monosaccharide that does not have a chiral center?

A
  • Stereoisomers, mirror images
  • dihydroxyacetone
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16
Q

What type of stereoisomers are most of the hexoses ?

A

D-stereoisomers

17
Q

What are the enantiomers in sugar ?

A
  • D and L isomers of a sugar are enantiomers and have similar physical properties.
  • e.g. L and D glucose have the same water solubility.
18
Q

What are Diastereoisomers ?

A
  • are stereoisomers that are not mirror images of each other.
19
Q

Epimers

A

Two sugars that differ only in the configuration around one carbon atom.

20
Q

Name (2) examples of epimers

A
  • D-Glucose and D-Mannose
  • D-Glucose and D-Galactose
21
Q
A