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Question 1

Explain the polar nature of water.

Answer 1

-O is more electronegative than H and is an unequal share of e- / e- spend more time orbiting around O than H
-Gives regions of slight positive and negative

Question 2

State the two structures that make up starch.

Answer 2

Amylose and Amylopectin

Question 3

What are the 3 types of polysacchardies that alpha glucose can form?

Answer 3

Amylose
Amylopectin
Glycogen

Question 4

Based on the arrangement of cellulose molecules, explain why cell walls provide strength and support to plant cells.

Answer 4

-Cellulose molecules form hydrogen bonds with eachother to make microfibrils
-Microfibrils join to make macrofibrils
-Fibres are insoluble and tough

Question 5

How can we test for starch?

Answer 5

Iodine Solution

Question 6

How can we use a colourimeter to do a quantitative Benedict’s test?

Answer 6

-Measures the absorbance or transmission of light by a coloured solution
-More concentrated means more light absorbed so less light transmitted
-Compare data table

Question 7

What are the two parts that make up carboxylic acid?

Answer 7

Carboxyl group
Hydrocarbon Chain

Question 8

Name the prosthetic group in Haemoglobin?

Answer 8

Iron ion in Haem group