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Biochemistry Lecture and Laboratory > Carbohydrates > Flashcards

Carbohydrates Flashcards

1
Q

what are the common number of carbon in monosaccharides?

A

pentose

hexose

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2
Q

H-C=O is?

A

Aldehyde

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3
Q

C-C=O is?

A

Ketone (C2)

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4
Q

reactive site of molecule

where reaction takes place

A

functional group

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5
Q

T or F

FUNCTIONAL GROUP dictates the properties and characteristics of molecule

A

True

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6
Q

we commonly arrange the monosaccharides in this structure

A

Fischer Projection

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7
Q

OH is on the left side of penultimate carbon

A

L Isomer

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8
Q

Next to the Last Carbon that dictates if it’s L or D isomer

A

Penultimate Carbon (C5)

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9
Q

T or F

D isomer is more Common in Proteins
L isomer is more Common in Carbohydrates

A

False

D is more common to Carbohydrates
L is more common to Proteins

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10
Q

which is greater in number? hexose or pentose in nature?

A

hexose

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11
Q

mirror images to each other

A

Enantiomers

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12
Q

only 1 chiral center with different configuration

A

Epimers

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13
Q

not mirror images

A

diasteromers

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14
Q

T or F

D & L enantiomers are not identical when it comes to density, melting point, refractive index and boiling point.

A

False

mirror images sila kaya SAME lahat ng Physical Properties

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15
Q

T or F

it is easy to separate D and L isomer

A

False

maraming steps

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16
Q

cyclic structure

A

Haworth Projection

hemiacetal (c1-c5)
hemiketal (c2-c5)

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17
Q

T or F

in haworth projection, hydroxyl group ATTACKS the C1 to from cyclic structure

A

True

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18
Q

T or F

we place the
left side to the up
right side to the down

A

True

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19
Q

T or F

nagkakaroon ng cyclic projection pag nasa solution

A

True

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20
Q

if the monosaccharide is in the hawporth projection we add ______ as its last name

A

Pyranose

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21
Q

OH is in downward

A

Alpha Configuration

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22
Q

OH is on upward

A

Beta Configuration

23
Q

T or F

Hydrogen H+ are protonated that’s why its also prone to attack of negative molecule

A

True

24
Q

What are the Reducing Sugars?

A

All Monosaccharide

Maltose and Lactose

25
Q

what are the Non-Reducing Sugars?

A

Sucrose afaik

26
Q

it can be oxidize by weak oxidizing agent

A

Reducing Sugar

-can form a free carbonyl group C=0

27
Q

T or F

it is in the anomeric carbon (C1 - C5 (aldose) C2- C5 (ketose)) where we can know if it can form a free carbonyl group

A

True

28
Q

What should be hydrolyzed to form free carbonyl group?

A

C1 or C5

29
Q

its like Haworth projection

A

Chair conformation

30
Q

T or F

haworth has alpha and beta
chair has axial and equatorial

A

True

31
Q

In Chair configuration,

OH lies downward

A

Axial

32
Q

In Chair Configuration,

OH lies upward

A

Equatorial

33
Q

T or F

Left side lies on Equatorial position

A

False

pag
Left - axial
Right - equatorial

34
Q

T or F

we use anomeric carbon in fischer, haworth, chair

A

False

sa Haworth & Chair Lang

35
Q

bond that is sharing of electrons

A

Covalent Link

mono & disaccharides

36
Q

glucose + galactose =

A

Lactose

37
Q

bonds in disaccharides

A

Glycosidic Bond

38
Q

T or F

we can’t and must not break the OXIDE BOND of disaccharides

A

False

we can’t and must not break the GLYCOSIDIC of dissacharides
kasi babalik sila into monosaccharides

39
Q

T or F

it can be a reducing sugar if the Anomeric Carbon of the sugar is not covalently link to the glycosidic bond

A

True

Glucose & Galactose (c1&c5)
Fructose (c2&c5)

40
Q

Glucose + Fructose=

A

Sucrose

41
Q

T or F

/ beta- upward
V aplha - downward

A

True

42
Q

polymers of glucose in plants called starch

A

Amylose & Amylopectin

43
Q

T or F

Amylose is blue if cooked & release the iodine

A

True

44
Q

T or F

Amylopectin is violet if uncooked traps Iodine in helix structure

A

True

45
Q

Glycosidic bond of Fructose

A

C2 & C5

46
Q

Glycosidic Bond of Glucose & Galactose

A

C1 & C4

47
Q

a (1, 4) and a (1,6) linkages

A

Amylopectin

48
Q

a (1, 4) linkages

A

Amylose

49
Q

if we are about to produce a free carbonyl in sucrose what carbon should we hydrolyze in fructose?

A

C5 of Fructose

50
Q

Anomeric carbon of Aldose

A

C1

51
Q

Anomeric Carbon of Fructose

A

C2

52
Q

T or F

if the anomeric carbon is involved in the glycosidic bond we can produce a free carbonyl group

A

False

pag anomeric carbon na ang involved hindi na pwedeng maging reducing sugar

53
Q

Carbon ____ should be breakdown to form a free carbonyl group

A

C5

Biochemistry Lecture and Laboratory (8 decks)

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