IGCSE Biology Paper-4: Specimen Questions with Answers 205 - 208 of 279
Passage
A gene is involved in the production of the enzyme alcohol dehydrogenase.
Question 205 (1 of 2 Based on Passage)
Write in Short
Short Answer▾Describe the role of ribosomes in the synthesis of proteins such as enzymes.
Explanation
Ribosomes provide framework on which protein synthesis takes place. The mRNA binds to the subunit of ribosome to form initiation complex. The main role of ribosome is its ability to catalyze the formation of peptide bonds between amino acids, so that the amino acids are incorporated into proteins. Ribosomes are dense granules without covering membranes.
Question 206 (2 of 2 Based on Passage)
Explanation
Genes or mendelian factor: Units of inheritance. They contain information required to express a particular trait.
OR
Segment of DNA responsible for a specific trait.
Passage
Penicillin is an antibiotic.
Question 207 (1 of 2 Based on Passage)
Write in Brief
One Liner▾Explain why it is important to complete a full treatment of antibiotics.
Explanation
Patients have always been advised to finish their course of antibiotics even if they՚re feeling better. The reasons given are that this will stop the infection from returning, as well as reduce the risk of the bacteria becoming resistant to the antibiotics.
Question 208 (2 of 2 Based on Passage)
Explanation
Antibiotics are strong medicines that treat bacterial infections. Antibiotics won՚t treat viral infections because they can՚t kill viruses. Common illnesses caused by bacteria are urinary tract infections, strep throat, and some pneumonia.