Problem 154 - Objective Biology for NEET

Question

The perinuclear space is about (a) 1-5 nm (b) \(5-10 \mathrm{~nm}\) (c) \(10-50 \mathrm{~nm}\) (d) \(>100 \mathrm{~nm}\)

Step-by-Step Solution

Answer

The width of the perinuclear space is typically between 20 to 40 nm, thus the correct answer is (c) \(10-50 \mathrm{~nm}\).

Step 1: Recall knowledge about Cellular Biology

Look for information about the perinuclear space in your biology class notes, textbook, or credible online resources. There you can find the exact width of the perinuclear space.

Step 2: Compare the Information

Compare the information you obtained from your resources with the answer choices given in the exercise. Each of the results a, b and c represent ranges, while the other one, d, represents all values greater than a specific number.

Step 3: Choose appropriate answer

Choose the correct answer based on your findings. The width of the perinuclear space is typically between 20 to 40 nm, so the closest correct answer would be (c) \(10-50 \mathrm{~nm}\).

Key Concepts

Perinuclear Space

The perinuclear space is a small gap that exists between the inner and outer membranes of the nuclear envelope. It plays a critical role in the organization and protection of the nucleus within a cell.

Here are some key points to understand about the perinuclear space:

• It is typically between 20 to 40 nanometers in width, serving as a buffer zone between the inner and outer nuclear membranes.
• The perinuclear space provides structural support to the nucleus, ensuring it maintains its shape and integrity.
• This space also acts as a medium for the transport of molecules between the cytoplasm and the nucleoplasm, facilitated by nuclear pores.

Understanding the perinuclear space aids in comprehending how cells protect their genetic material and manage intracellular transport.

Cell Structure

Cells are the basic building blocks of all living organisms, and their structure is vital in maintaining the various functions required for life. Each part of a cell has a unique role, ensuring cellular health and functionality.

Essential elements of cell structure include:

• The cell membrane, which is selectively permeable to regulate the passage of substances into and out of the cell.
• Organelles like the nucleus, mitochondria, and ribosomes, each performing specific tasks to maintain cellular processes.
• The cytoplasm, a gel-like fluid that holds the organelles in place and facilitates movement within the cell.

Understanding cell structure is crucial for grasping how cells operate, interact with their environment, and contribute to the organism's overall functions.

Nuclear Envelope

The nuclear envelope, also known as the nuclear membrane, is a double membrane structure that encases the nucleus in eukaryotic cells. Its primary function is to protect the genetic material within the nucleus from damage and assist in regulating gene expression.

Key features of the nuclear envelope include:

• It consists of two lipid bilayers – the inner and outer nuclear membranes – separated by the perinuclear space.
• Nuclear pores embedded in the envelope facilitate the transport of essential molecules like RNA and proteins in and out of the nucleus.
• It helps in maintaining the shape of the nucleus through attachment to the nuclear lamina, providing an additional layer of structural support.

The nuclear envelope is essential in ensuring the integrity and stability of a cell's genetic information, playing a central role in the life of a cell.