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Read the following statements regardingr...

Read the following statements regardingribosomes:-
(i) 0.001 M concentration of calcium ion is required for the binding of subunits
(ii) Also known as organelle within organelle.
(iii)5 S r-RNA is common to both 70 S and 80 S ribosomes.
(iv)All the components of ribosome are synthesised in nucleolus. Which of the above statements are incorrect?

A

(i) & (iv)

B

(i) & (ii)

C

(ii) & (iii)

D

(ii) & (iv)

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements regarding ribosomes are incorrect, let's analyze each statement step by step. ### Step 1: Analyze Statement (i) **Statement:** 0.001 M concentration of calcium ion is required for the binding of subunits. **Analysis:** This statement is incorrect. Ribosomes require magnesium ions (Mg²⁺) for the binding of their subunits, not calcium ions (Ca²⁺). Therefore, this statement is false. ### Step 2: Analyze Statement (ii) **Statement:** Also known as organelle within organelle. **Analysis:** This statement is correct. Ribosomes are often referred to as "organelle within an organelle" because they can be found within other organelles, such as mitochondria and chloroplasts, which themselves are considered organelles. Thus, this statement is true. ### Step 3: Analyze Statement (iii) **Statement:** 5 S r-RNA is common to both 70 S and 80 S ribosomes. **Analysis:** This statement is correct. The 5S rRNA is indeed a component of both 70S ribosomes (found in prokaryotes) and 80S ribosomes (found in eukaryotes). Therefore, this statement is true. ### Step 4: Analyze Statement (iv) **Statement:** All the components of ribosome are synthesized in nucleolus. **Analysis:** This statement is incorrect. While ribosomal RNA (rRNA) is synthesized in the nucleolus, ribosomal proteins are synthesized in the cytoplasm and then imported into the nucleolus for assembly with rRNA. Therefore, this statement is false. ### Conclusion Based on the analysis: - Incorrect statements: (i) and (iv) - Correct statements: (ii) and (iii) ### Final Answer The incorrect statements are (i) and (iv). ---
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