Chapter 4

Question 1

chemical elements that make up: carbohydrates, fats and proteins

Answer 1

carbohydrates - CHO
fats - CHO
proteins- CHON

Question 2

Monomers of carbohydrates

Answer 2

Glucose

Question 3

Monomers of proteins

Answer 3

Amino acid

Question 4

Monomers of Lipids

Answer 4

Fatty acid and glycerol

Question 5

Test for starch

Answer 5

Iodine solution
-Posotive:Blue black
-Negative:Orange yellow

Question 6

Test for glucose

Answer 6

Benedict’s solution
Positive - brick red
Negative - blue
Heated

Question 7

Test for protein

Answer 7

Buriet solution
-Positive:Purple
-Negative:No change

Question 8

Test for lipids

Answer 8

Ethanol
-Positive: Milk white emulsion
-Negative: No change

Question 9

Test for vitamin c

Answer 9

DCPIP test
Negative stays blue
Positive colorless

Question 10

Structure of the DNA

Answer 10

-two strands coiled together to form a double helix
- each strand contains chemicals called bases
- bonds between pairs of bases hold the strands together
- the bases always pair up in the same way: A with T, and C with G