Nucleus : Structure and Function

What are the main components of the nuclear envelope?केन्द्रक आवरण के मुख्य घटक क्या हैं?

• Nuclear envelope, nucleoplasm, and nuclear laminaन्यूक्लियस आवरण, न्यूक्लियोप्लाज्म और न्यूक्लियर लैमिना

• Nuclear ribosomes, nuclear cytoplasm, and chromatinराइबोसोम, साइटोप्लाज्म और क्रोमैटिन

• Inner membrane, outer membrane, and nuclear matrixआंतरिक झिल्ली, बाहरी झिल्ली और केन्द्रक मैट्रिक्स

• The main components of the nuclear envelope are the inner nuclear membrane, outer nuclear membrane, and nuclear pores.केन्द्रक आवरण के मुख्य घटक आंतरिक केन्द्रक झिल्ली, बाहरी केन्द्रक झिल्ली और केन्द्रक छिद्र हैं।

Describe the structure of the nuclear pore complex.

• The nuclear pore complex is a rigid barrier that prevents any transport between the nucleus and cytoplasm.

• The nuclear pore complex is a linear chain of nucleotides that facilitates DNA replication.

• The nuclear pore complex is a small, spherical structure found only in prokaryotic cells.

• The nuclear pore complex is a large, octagonal protein structure that spans the nuclear envelope, regulating transport between the nucleus and cytoplasm.

What is the primary function of the nuclear envelope?केन्द्रक आवरण का प्राथमिक कार्य क्या है?

• To protect the nucleus and regulate the exchange of materials between the nucleus and the cytoplasm.केन्द्रक की रक्षा करना और केन्द्रक तथा साइटोप्लाज्म के बीच पदार्थों के आदान-प्रदान को नियंत्रित करना।

• To generate energy for the cell.कोशिका के लिए ऊर्जा उत्पन्न करना।

• To store genetic information.आनुवंशिक जानकारी संग्रहीत करने के लिए.

• To synthesize proteins.प्रोटीन को संश्लेषित करने के लिए.

How does the nuclear membrane contribute to cellular organization?केन्द्रक झिल्ली कोशिकीय संगठन में किस प्रकार योगदान करती है?

• The nuclear membrane allows free movement of substances between the nucleus and cytoplasm.केन्द्रक झिल्ली केन्द्रक और साइटोप्लाज्म के बीच पदार्थों के मुक्त आवागमन की अनुमति देती है।

• The nuclear membrane helps in the synthesis of proteins in the cytoplasm.केन्द्रक झिल्ली कोशिका द्रव्य में प्रोटीन के संश्लेषण में मदद करती है।

• The nuclear membrane is responsible for energy production within the cell.
  केन्द्रक झिल्ली कोशिका के भीतर ऊर्जा उत्पादन के लिए जिम्मेदार है।

• The nuclear membrane contributes to cellular organization by separating the nucleus from the cytoplasm, maintaining distinct environments for genetic material and regulating substance exchange. केन्द्रक झिल्ली कोशिका द्रव्य से केन्द्रक को अलग करके, आनुवंशिक सामग्री के लिए अलग वातावरण बनाए रखने और पदार्थ विनिमय को विनियमित करके सेलुलर संगठन में योगदान देती है।

Explain the role of nuclear pores in transport processes.

• Nuclear pores regulate the transport of molecules between the nucleus and cytoplasm, allowing selective exchange of proteins and RNA.

• Nuclear pores are involved in energy production within the nucleus.

• Nuclear pores only allow the passage of small ions.

• Nuclear pores are responsible for DNA replication.

What is the significance of the double membrane structure of the nuclear envelope?

• The double membrane structure is primarily for DNA replication.

• It serves as a barrier to prevent all types of molecules from entering the nucleus.

• The double membrane structure of the nuclear envelope protects the nucleus and regulates material exchange.

• It allows the nucleus to communicate directly with the cytoplasm.

How do proteins and RNA pass through the nuclear pore complex?

• Proteins and RNA diffuse freely through the nuclear pore complex without any assistance.

• Only RNA can pass through the nuclear pore complex, while proteins are excluded.

• Proteins and RNA are transported through the nuclear pore complex by passive diffusion only.

• Proteins and RNA pass through the nuclear pore complex via specific transport mechanisms involving importins and exportins.

What are the differences between the inner and outer membranes of the nuclear envelope?

• The outer membrane is involved in DNA replication, while the inner membrane is not.

• Both membranes are identical in structure and function.

• The inner membrane contains ribosomes, while the outer membrane is associated with chromatin.

• The inner membrane is associated with chromatin and nuclear lamina, while the outer membrane is continuous with the endoplasmic reticulum and has ribosomes.

Discuss the role of the nuclear membrane in gene expression regulation.

• The nuclear membrane regulates gene expression by controlling RNA transport and organizing chromatin structure.

• The nuclear membrane has no impact on RNA transport.

• The nuclear membrane prevents all gene expression from occurring.

• The nuclear membrane is solely responsible for DNA replication.