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Chapter 1: Problem 17

Thin thread-like structure present inside the nucleus is called

Short Answer

Expert verified
Answer: The thread-like structure inside the nucleus is called "chromosome." It is composed of DNA and proteins and carries the genetic information in the form of genes, essential for the inheritance and expression of traits in living organisms.

Step by step solution

01

Understand the structure of a cell and its nucleus

A cell is the basic structural and functional unit of living organisms. The nucleus, as a vital component inside the cell, contains the cell's genetic material. The nucleus is protected by a double-layered membrane, called the nuclear envelope. Inside the nucleus, there are thread-like structures containing the genetic information. Let's identify these structures.
02

Identify the thread-like structures within the nucleus

The thread-like structures present inside the nucleus are called "chromosomes." These long and thin structures are made of a combination of DNA (Deoxyribonucleic acid) and proteins called histones. The DNA carries the genetic information in the form of genes, whereas proteins help in organizing and packing the DNA.
03

Definition of the thread-like structure

The thin, thread-like structure present inside the nucleus is called "chromosome." It is composed of DNA and proteins and carries the genetic information in the form of genes, which are essential for the inheritance and expression of traits in living organisms.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Cell Structure
Cells are the fundamental building blocks of all living organisms. They come in various shapes and sizes, but all cells share some common structures. One of the key parts is the cell membrane, which acts as a barrier controlling the passage of substances in and out of the cell.
Inside the cell, you'll find the cytoplasm, a jelly-like substance where other organelles function. Each organelle has a specific role, and they all work together to keep the cell alive and functioning.
  • The nucleus is like the control center of the cell.
  • Other structures include mitochondria, ribosomes, and the endoplasmic reticulum.
  • Each part of the cell has its own unique job, contributing to the cell's survival and role in the organism.
Nucleus
The nucleus is a vital component of a cell, serving as its command center. It's typically spherical and located at the center of the cell.
Surrounded by a double-layered membrane known as the nuclear envelope, the nucleus keeps most of the cell's genetic material secure. This membrane has tiny pores allowing material to move in and out as needed.
  • The nucleus houses the chromosomes, which contain our DNA.
  • It is where cell regulation and division instructions are kept and processed.
  • The nucleolus within the nucleus is where ribosomal RNA is produced, essential for protein synthesis.
Genetic Material
Genetic material is what makes up the instructions for building and maintaining an organism. In cells, this material is primarily found as DNA.
This DNA is organized into structures called chromosomes within the nucleus. Each chromosome contains many genes, which are the basic units of heredity.
  • Genes are segments of DNA that code for proteins, influencing traits and characteristics.
  • Chromosomes ensure DNA is accurately replicated and distributed during cell division.
  • Any changes in genetic material can lead to genetic variations or mutations.
DNA and Proteins
DNA and proteins are closely intertwined within the cell nucleus forming chromosomes. DNA, or Deoxyribonucleic Acid, is the molecule that carries genetic instructions essential for the growth, development, functioning, and reproduction of all living organisms and many viruses.
DNA is wound around proteins called histones to keep it compact and organized inside the nucleus. This complex of DNA and proteins is what forms a chromosome.
  • DNA is shaped like a twisted ladder, called a double helix.
  • The sequences of nucleotides in DNA determine genes, which code for specific proteins.
  • Proteins perform a vast array of functions and are crucial for virtually every process within the cell.

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Most popular questions from this chapter

Plant cell wall is made up of

Adjacent plant cells are joined together by (a) Middle lamella (b) Plasmodesmata (c) Mesosomes (d) Plasma membrane

Which of the following statement is wrong? (a) Vacuoles are either absent or small in animal cells. (b) Centrosomes are absent in animal cells. (c) Centrosomes are absent in plant cells. (d) Centrosomes help in cell division.

Which of the following cell lacks nucleus? (a) Mature RBC (b) Mature WBC (c) Neutrophils (d) Paramoecium

The longest cell is (a) Mycoplasma (b) Neuron (c) \(\mathrm{PPLO}\) (d) Ostrich egg
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