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Biochemistry Midterm Lab Exam > Experiment on Cellulose 2.0 > Flashcards

Experiment on Cellulose 2.0 Flashcards

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1
Q

___, a fibrous carbohydrate found in all plants, is the structural component of plant cell walls.

A

Cellulose

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2
Q

Because the earth is covered with vegetation, cellulose is the most abundant of all carbohydrates, accounting for over ___% of all
the carbon found in the vegetable kingdom.

A

50

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3
Q

Cotton fibrils and filter paper are entirely cellulose (about ___%)

A

95

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4
Q

Branch of Starch

A

Moderately branched

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5
Q

Branch of Glycogen

A

Highly branched

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6
Q

Branch of Cellulose

A

Unbranched

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7
Q

Solubility of Cellulose in WATER (H20)

A

INSOLUBLE

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8
Q

Solubility of Cellulose in CONC. H2SO4 (CONCENTRATED SULURIC ACID)

A

SOLUBLE

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9
Q

Solubility of Cellulose in DILUTE H2SO4

A

INSOLUBLE

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10
Q

Solubility of Cellulose in CONC. NaOH (CONCENTRATION OF SODIUM HYDROXIDE)

A

SLIGHTLY SOLUBLE

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11
Q

Solubility of Cellulose in DILUTE NaOH

A

INSOLUBLE

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12
Q

IODINE TEST: STARCH + IODINE
= ?

A

Deep Blue

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13
Q

COTTON + IODINE
= ?

A

YELLOW TO BROWN TO BLACK

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14
Q

SCHWEITZER’S Reagent is?

A

(Ammoniacal Cupric Hydroxide)

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15
Q

IS THE FILTER PAPER SOLUBLE IN SCHWEITZER’S REAGENT?

A

(YES) SOLUBLE

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16
Q

DESCRIBE THE REACTION OF THE SOLUTION (Ammoniacal Cupric Hydroxide) TO ACETIC ACID.

A

CELLULOSE PRECIPITATES WHEN ACETIC ACID WAS ADDED
TURNING INTO A LIGHT GREEN COLOR.

17
Q

WHAT IS FORMED IN THIS REACTION? (SCHWEITZER’S TEST)

A

AMORPHOUS PRECIPITATE

18
Q

CROSS & BEAVAN’S TEST reagent is?

A

(Zinc Chloride)

19
Q

DESCRIBE THE SOLUBILITY OF THE FILTER PAPER IN CROSS & BEAVAN’S SOLUTION:

A

CELLUOSE DISSOLVES IN THE SOLUTION (SOLUBLE)

20
Q

DESCRIBE THE REACTION AFTER THE ADDITION OF 95% ETHYL ALCOHOL.

A

-THERE IS A REPRECIPITATION OF CELLULOSE

21
Q

WHAT IS FORMED? CROSS & BEAVAN’S TEST

A

AMORPHOUS PRECIPITATE

22
Q

FORMATION OF AMYLOID: DESCRIBE THE PRODUCT FORMED AFTER THE FILTER PAPER DISSOLVED.

A

A JELLY SOLUTION WAS FORMED

23
Q

FORMATION OF AMYLOID: DESCRIBE THE PRODUCT FORMED WHEN FILTRATE ON A WATCH GLASS

A

A WAXY SUBSTANCE WAS FORMED (AMYLOID)

24
Q

AMYLOID REACTION TO BENEDICT’S TEST

A

COLORLESS SOLUTION

25
Q

WHAT DOES THIS MEAN? (AMYLOID REACTION TO BENEDICT’S TEST)

A

THERE IS A RLATIVELY SMALL NUMBER OF REDUCING SUGAR
MOIETIES, WHICH ONLY OCCURS AT THE END OF CARBOHYDRATE
CHAIN

26
Q

AMYLOID REACTION TO IODINE TEST

A

REDDISH- BROWN REACTION

27
Q

WHAT DOES THIS MEAN? (AMYLOID REACTION TO IODINE TEST)

A

APPEARANCE OF AN AMYLOSE-IODINE COMPLEX

Biochemistry Midterm Lab Exam (3 decks)

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