Postlab midterms

Question 1

THEY ARE THE KEY SOURCE OF
ENERGY USED BY LIVING THINGS.

Answer 1

CARBOHYDRATES

Question 2

CARBOHYDRATES ALSO SERVES AS ________

Answer 2

EXTRACELLULAR STRUCTURAL ELEMENTS

Question 3

THEY ARE DEFINED AS THE POLYHYDROXY ALDEHYDES OR POLYHYDROXY KETONES.

Answer 3

CARBOHYDRATES

Question 4

USED IN THE HUMAN BODY

Answer 4

D-GLUCOSE

Question 5

SIMPLE SUGARS ENDS WITH _______

Answer 5

–OSE

Question 6

Contains One unit of sugar

Answer 6

SIMPLE SUGAR

Question 7

Contains more than 1 unit of sugar

Answer 7

COMPLEX SUGAR

Question 8

CONTAIN ONE MONOSACCHARIDE UNIT

Answer 8

MONOSACCHARIDES

Question 9

CONTAIN TWO MONOSACCHARIDE UNITS.

Answer 9

DISACCHARIDES

Question 10

CONTAIN 3-9 MONOSACCHARIDE

Answer 10

OLIGOSACCHARIDES

Question 11

CAN CONTAIN MORE THAN 9 MONOSACCHARIDE UNITS.

Answer 11

OLIGOSACCHARIDES

Question 12

COMPLEX CARBOHYDRATES CAN BE BROKEN DOWN INTO SMALLER SUGAR UNITS THROUGH A PROCESS KNOWN AS

Answer 12

HYDROLYSIS.

Question 13

IT CONTAINS A CARBONYL GROUP ATTATCHED TO TWO R GROUPS HAVING ONE OR MORE HYDROXYL
GROUPS.

Answer 13

KETOSE

Question 14

IS A COLORLESS LIQUID BUT TENDS
TO TURN BROWN UPON PROLONGED EXPOSURE ON
AIR AND MOISTURE.

Answer 14

FURFURAL

Question 15

PHENOLIC COMPOUNDS WILL REACT WITH FURFURAL OR HYDROXYMETHYL FURFURAL IN THE PRESENCE OF ACID TO FORM COLORED CONDENSATION PRODUCTS. (T/F)

Answer 15

TRUE

Question 16

IT IS PRODUCED BY REMOVING WATER FROM OR DEHYDRATING FIVE-CARBON SUGARS SUCH AS XYLOSE AND ARABINOSE.

Answer 16

FURFURAL

Question 17

THE GENERAL TEST TO DETECT THE PRESENCE
OF CARBOHYDRATES

Answer 17

MOLISCH TEST

Question 18

MOLISH TEST: MONOSACCHARIDE GIVES A _____ POSITIVE TEST, DISACCHARIDES AND POLYSACCHARIDES REACT ________.

Answer 18

RAPID
SLOWER

Question 19

POSTITIVE RESULT FOR MOLISH TEST

Answer 19

PURPLE COLOR/ RING

Question 20

TEST IS USED TO DISTINGUISH BETWEEN PENTOSE AND HEXOSE MONOSACHARIDES.

Answer 20

BIAL’S TEST

Question 21

POSITIVE RESULT FOR BIAL’S TEST

Answer 21

PENTOSE - BLUE-GREEN COMPLEX (ARIBINOSE)
HEXOSE - BROWN COMPLEX

Question 22

TEST IS USED TO DISTINGUISH BETWEEN ALDOSES (LIKE GLUCOSE) AND KETOSES (LIKE FRUCTOSE).

Answer 22

SELIWANOFF’S TEST

Question 23

RESULTS FOR SELIWANOFF’S TEST

Answer 23

POSTIVE (KETONES) - Cherry Red Color
NEGAITVE (Lactose/Glucose) - No Change

Question 24

THEY ARE CAPABLE OF TRANSFERRING HYDROGEN TO OTHER COMPOUNDS. THEY ALSO HAVE A FREE CARBONYL GROUP, ONE THAT CAN REACT WITH AN
OXIDIZING AGENT.

Answer 24

REDUCING SUGARS

Question 25

TEST FOR THE PRESENCE OF REDUCING SUGARS.

Answer 25

BENEDICT’S TEST

Question 26

NON-REDUCING SUGARS EXAMPLES

Answer 26

LARGE POLYMERS OF GLUCOSE SUCH AS STARCH,

Question 27

SUCROSE TEST NEGATIVE IN BENEDICT’S TEST (T/F)

Answer 27

TRUE

Question 28

TEST IS PERFORMED TO DISTINGUISH BETWEEN
REDUCING MONOSACCHARIDES, REDUCING
DISACCHARIDES AND NON REDUCING DISACCHARIDES.

Answer 28

BARFOED’S TEST

Question 29

BARFOED’S TEST IS A SLIGHTLY ACIDIC MEDIUM (T/F)

Answer 29

TRUE

Question 30

NEGATIVE RESULT FOR BARFOED’S

Answer 30

SUCROSE
LACTOSE

Question 31

NEGATIVE RESULT FOR BARFOED’S

Answer 31

SUCROSE
LACTOSE

Question 32

ALSO KNOWN AS THE SILVER-MIRROR TEST, IS
USED TO IDENTIFY BETWEEN AN ALDEHYDE
AND A KETONE.

Answer 32

TOLLEN’S TEST