The digestive system is made up of a number of different organs - Edexcel - GCSE Biology - Question 3 - 2012 - Paper 1
Question 3
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.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
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?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
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.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
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.
