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Read the following statements and choose...

Read the following statements and choose the correct statements. A. Cilia and flagella are covered with plasma membrane. B. Centrioles form the basal body of only cilia and not flagella. C. Approximately 2 m long thread of DNA is distributed among 46 pairs of chromosomes in a single human cell. D. Movement of proteins and RNA into or out of nucleus occurs through nuclear pores.

A

A, B, & D

B

A, B & C

C

B, C & D

D

A, C & D

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze each statement one by one and determine whether they are correct or incorrect. ### Step-by-Step Solution: 1. **Statement A**: "Cilia and flagella are covered with plasma membrane." - **Analysis**: Cilia and flagella are indeed hair-like structures that protrude from the surface of cells. They are extensions of the plasma membrane and are covered by it. Therefore, this statement is **correct**. 2. **Statement B**: "Centrioles form the basal body of only cilia and not flagella." - **Analysis**: Centrioles are cylindrical structures that serve as the base for both cilia and flagella, forming their basal bodies. They are not exclusive to cilia; they are also essential for the formation of flagella. Thus, this statement is **incorrect**. 3. **Statement C**: "Approximately 2 m long thread of DNA is distributed among 46 pairs of chromosomes in a single human cell." - **Analysis**: Each human cell contains 46 chromosomes (23 pairs), and the total length of DNA in these chromosomes is indeed about 2 meters when fully extended. Therefore, this statement is **correct**. 4. **Statement D**: "Movement of proteins and RNA into or out of nucleus occurs through nuclear pores." - **Analysis**: The nuclear envelope contains nuclear pores that regulate the transport of proteins and RNA between the nucleus and the cytoplasm. This statement is also **correct**. ### Summary of Statements: - Statement A: Correct - Statement B: Incorrect - Statement C: Correct - Statement D: Correct ### Conclusion: The correct statements are A, C, and D. Therefore, the answer would be the option that includes A, C, and D.
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