The digestive system is made up of a number of different organs. (a) Define the term organ. (b) (i) How many of the statements are correct? - The low pH of the stomach kills bacteria. - The low pH of the stomach provides optimum conditions for pepsin activity. - The pH of the stomach is low so that acid digests protein. Put a cross (X) in the box next to your answer. - A none - B 1 - C 2 - D 3 (ii) Complete the sentence by putting a cross (X) in the box next to your answer. Protein is broken down to form - A amino acids - B fatty acids - C glucose - D glycerol

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The digestive system is made up of a number of different organs - Edexcel - GCSE Biology - Question 3 - 2012 - Paper 1

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The digestive system is made up of a number of different organs. (a) Define the term organ. (b) (i) How many of the statements are correct? - The low pH of the st... show full transcript

Worked Solution & Example Answer:The digestive system is made up of a number of different organs - Edexcel - GCSE Biology - Question 3 - 2012 - Paper 1

Step 1

Define the term organ.

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Answer

An organ is defined as a group of different tissues that work together to perform specific functions within an organism.

Step 2

How many of the statements are correct?

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To assess the correctness of the statements:

The low pH of the stomach kills bacteria. This statement is true; the acidic environment helps to eliminate harmful bacteria.
The low pH of the stomach provides optimum conditions for pepsin activity. This statement is also true; pepsin, an enzyme in the stomach, works best in acidic conditions.
The pH of the stomach is low so that acid digests protein. This statement is accurate as well; the acid helps to denature proteins, making them easier to digest.

Since all three statements are correct, the answer is: D 3.

Step 3

Complete the sentence by putting a cross (X) in the box next to your answer.

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Answer

Protein is broken down to form A amino acids. This is because during digestion, proteins are hydrolyzed into their constituent amino acids, which are then absorbed by the body.

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The digestive system is made up of a number of different organs - Edexcel - GCSE Biology - Question 3 - 2012 - Paper 1

Worked Solution & Example Answer:The digestive system is made up of a number of different organs - Edexcel - GCSE Biology - Question 3 - 2012 - Paper 1

Define the term organ.

How many of the statements are correct?

Complete the sentence by putting a cross (X) in the box next to your answer.

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