QCM : Fundamentals of Biological and Physical Sciences — 10 questions

Explication

DNA is the molecule that contains genetic information in the nucleus of cells, structured as a double helix, which is fundamental to genetics.

Explication

DNA's double helix structure is essential for its ability to store genetic information securely and to allow copying during cell division. The double helix also protects the genetic code from damage.

Explication

The brain is a major component of the nervous system, responsible for processing information and coordinating responses. The heart, lungs, and liver are vital organs but are not components of the nervous system.

Explication

Humans have 23 pairs of chromosomes, totaling 46 chromosomes. This pairing is crucial for genetic inheritance and stability.

Explication

The main function of immunity is to protect the body from infections by recognizing and destroying pathogens like bacteria and viruses.

Explication

A gene is a specific segment of DNA that encodes information to produce a particular trait, such as eye color. It is not a chromosome or a protein itself.

Explication

Mutations are changes in DNA that can introduce genetic diversity, which is vital for evolution, but they can also lead to genetic disorders, depending on the context.

Explication

PCR (Polymerase Chain Reaction) and CRISPR gene editing are revolutionary techniques used to amplify and modify DNA, respectively, enabling advances in research, medicine, and agriculture.

Explication

Neurons are specialized nerve cells that transmit electrical signals (nerve impulses) to communicate and coordinate responses within the nervous system.

Explication

The synapse is the site where neurons communicate through chemical signals, facilitating the transmission of nerve impulses from one neuron to another.