Biology For Engineers – Debasmita Bhattacharya (1)

Immunoglobulins (antibodies) recognize and neutralize foreign invaders like bacteria and viruses. Blood-clotting proteins like thrombin prevent blood loss during injuries. Antifreeze proteins protect Arctic fish from freezing temperatures, while bacterial toxins such as diphtheria toxin can exploit host organisms. The remarkable diversity of protein functions arises from just 20 amino acids. Receptor Proteins in Cell Signalling Cells constantly monitor and react to their surroundings by receiving and processing external signals.

They often receive multiple signals at once, integrating them to determine an appropriate response. Cells also communicate with each other through chemical messengers. Prokaryotes use chemical signals to find food, while multicellular organisms utilize a wider range, including growth factors, hormones, neurotransmitters, and components of the extracellular matrix. These signals can act locally or travel long distances.

Receptors are protein molecules inside the target cell or on its surface that receive a chemical signal. Chemical signals are released by signalling cells in the form of small, usually volatile or soluble molecules called ligands. A ligand is a molecule that binds another specific molecule, in some cases, delivering a signal in the process. Ligands can thus be thought of as signalling molecules. Ligands and receptors exist in several varieties; however, a specific ligand will have a specific receptor that typically binds only that ligand.

Cells receive these chemical signals via receptors, which are proteins located either inside the cell or on its surface. Signalling cells release ligands, small molecules (often volatile or soluble), which bind specifically to these receptors. This binding initiates a signal transduction pathway within the cell. Essentially, ligands are the signalling molecules, and each type of ligand typically binds to only one specific type of receptor. For example, neurotransmitters act locally, traveling short distances between neurons or between neurons and muscle cells.

In contrast, follicle- stimulating hormone travels from the brain to the ovary to trigger egg release. Types of Receptor Proteins Internal Receptors They are majorly found in cytoplasm and are also known as intracellular or cytoplasmic receptors. They commonly bind with hydrophobic ligand molecules and helps in travelling across the plasma membrane. Once inside the cell, many of these molecules bind to proteins that act as regulators of mRNA synthesis.

Mechanism of action includes conformational changes of internal receptors upon binding to ligand molecules exposing the DNA binding site on its surface. The ligand-receptor complex moves into the nucleus, then binds to specific regions of the DNA and promotes the production of mRNA from specific genes.

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This product is the result of one such effort. Your feedback plays a critical role in the evolution of our products and you can contact us – [email protected]. We look forward to it. 1kitap1.com/en BIOLOGY FOR ENGINEERS Debasmita Bhattacharya Department of Basic Science and Humanities Ruchira Mukherjee Department of Basic Science and Humanities Dibyajit Lahiri Department of Biotechnology Moupriya Nag Department of Biotechnology Subhamoy Banerjee Department of Basic Science and Humanities Institute of Engineering & Management University of Engineering and Management Kolkata, West Bengal, India 1kitap1.com/en CONTENTS Foreword Preface About the Authors Testimonials 1.

Introduction Introduction to Biology for Engineers Complexities Associated with Biological Systems What is the Purpose of Biology? Why Biology is Multi-scaled? Why Biology is Integrative? Fundamental Similarities Between Science and Engineering Biomimicry: Nature Inspired Designs Similarities Between Eye and Camera Similarities Between Bird Flying and Aircraft Important Discoveries in Biology (From Early Breakthroughs to Modern Discoveries) Early Biological Thought (Before 16th Century) Biology in Medieval Era (Post 16th Century) Biology in Modern Era Seminal Advances in 18th Century that Shaped Modern Biology Robert Brown and Brownian Motion Julius Mayer and the Conservation of Energy Role of Artificial Intelligence in Biology Genomics and DNA Sequencing Protein Folding and Structural Biology Drug Discovery and Development Ecology and Conservation Microbiology and Pathogen Identification Systems Biology 2.

Classification Introduction Different Types of Classification System Historical Development of Classification Systems The Five Kingdom Classification System Limitations of the 5 Kingdom Classification Other Classification Systems: The Three-Domain System Archaea Bacteria Eukarya Comparison of the Five Kingdom and Three-Domain Systems Five Kingdom System Three-Domain System Binomial Nomenclature Different Other Criteria for Classification Classification Based on Cellularity Classification Based on Ultrastructure Classification Based on Energy and Carbon Utilization Classification Based on Excretion Classification Based on Habitat Molecular Taxonomy Model Organism Importance of Model Organism 3.

Genetics Introduction Monohybrid Cross Dihybrid Cross Some Events do not Strictly Follow Mendel’s Rules Epistasis How Epistasis Differs from Other Gene Interactions?

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