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Chapter 26: Problem 31

How many chromosomes are present in a human cell?

Short Answer

Expert verified
A human cell contains 46 chromosomes.

Step by step solution

01

Understanding the Basics

Chromosomes are structures within cells that contain DNA, which are essential for genetic information. In humans, these structures are located in the cell nucleus, and they come in pairs.
02

Human Chromosome Count

In humans, chromosomes are paired in a total of 23 pairs, which means every human cell (except for reproductive cells) contains a total of 46 chromosomes.

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Key Concepts

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

Genetic Information
Genetic information is the set of instructions that guides the development, functioning, growth, and reproduction of living organisms. It is encoded in the DNA molecules found within our chromosomes.

Each DNA molecule is composed of sequences called genes. These genes hold the key to our inherited traits. Two main functions of genetic information include:
  • Transmission: Passing traits from parents to offspring.
  • Function: Directing cells on protein synthesis to maintain the body.
An organism's entire genetic information or genome is compactly stored in chromosomes within the cell nucleus. This detailed packing ensures that during cell division, each new cell receives the right instructions.
Cell Nucleus
The cell nucleus is a vital organelle in eukaryotic cells, acting as the control center for the cell's functions. It houses the cell's genetic information in the form of DNA. This enclosure of DNA ensures its processes are protected and meticulously organized.

Key features of the cell nucleus include:
  • Surrounded by a double-membrane, called the nuclear envelope, to safeguard the genetic material.
  • Contains nuclear pores regulating material flow in and out of the nucleus.
  • Nucleolus located within, responsible for producing ribosomes.
The structure ensures that the genetic information is replicated and transcribed accurately, making it essential for life continuity.
DNA Structures
DNA structures are the building blocks of genetic material. Each DNA molecule is composed of two long strands forming a double helix, akin to a twisted ladder.

The sides of the ladder consist of sugar and phosphate molecules, while the rungs are pairs of four types of nitrogen bases: adenine (A), thymine (T), guanine (G), and cytosine (C). The specific pairing rules (A-T and G-C) ensure that genetic information is replicated with high fidelity.

Characteristics of DNA structures:
  • Double helix configuration provides stability.
  • Base pairing allows accurate replication.
  • Compact packaging within chromosomes.
These intricate structures allow DNA to efficiently store and transmit the necessary instructions for life.

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