Consider the following statement and choose the incorrect option.
a. Large and more numerous nucleoli are present in cells actively carrying out protein synthesis.
b. Nuclear pores allow bidirectional movement of molecules.
c. Cytoskeleton is a glycolipid structure for mechanical support , motility and maintenance of the shape of the cell.
d. Steroidal hormones are synthesized by Golgi complex .

Options

A. a and b
B. b and c
C. c and d
D. a and d

Answer

To solve the question, we need to evaluate each of the given statements and identify the incorrect one. Let's analyze them step by step.

### Step 1: Analyze Statement A
**Statement A:** "Large and more numerous nucleoli are present in cells actively carrying out protein synthesis."

- **Explanation:** Nucleoli are the sites of ribosomal RNA (rRNA) synthesis and assembly of ribosomes. Cells that are actively synthesizing proteins typically have larger and more numerous nucleoli because they require more ribosomes for translation. Thus, this statement is **correct**.

### Step 2: Analyze Statement B
**Statement B:** "Nuclear pores allow bidirectional movement of molecules."

- **Explanation:** Nuclear pores are large protein complexes that span the nuclear envelope and regulate the transport of molecules between the nucleus and the cytoplasm. They indeed allow the movement of molecules in both directions (from nucleus to cytoplasm and vice versa). Therefore, this statement is also **correct**.

### Step 3: Analyze Statement C
**Statement C:** "Cytoskeleton is a glycolipid structure for mechanical support, motility, and maintenance of the shape of the cell."

- **Explanation:** The cytoskeleton is primarily composed of proteins (such as microtubules, microfilaments, and intermediate filaments) and is responsible for providing structural support, facilitating cell motility, and maintaining cell shape. It is **not** a glycolipid structure. Hence, this statement is **incorrect**.

### Step 4: Analyze Statement D
**Statement D:** "Steroidal hormones are synthesized by Golgi complex."

- **Explanation:** Steroidal hormones are synthesized in the smooth endoplasmic reticulum (SER), not the Golgi complex. The Golgi apparatus is involved in modifying, sorting, and packaging proteins and lipids, but it does not synthesize steroid hormones. Therefore, this statement is also **incorrect**.

### Conclusion
Based on the analysis:
- Statement A: Correct
- Statement B: Correct
- Statement C: Incorrect
- Statement D: Incorrect

The question asks for the **incorrect option**, and since both Statements C and D are incorrect, the answer to the question is **C**.

### Final Answer
The incorrect options are **C** and **D**.

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