COFACTORS AND COENZYMES
abidaCofactors The metal ions which are loosely attached with the enzymes are called cofactors. These metal ions are Ca-2, mg-2, mn-2, 2, Cu" and Zr12. These metal ions change a…
Enzymes : Biological Catalysts
An enzyme is a biological catalyst that can accelerate a specific chemical reaction by lowering the activation energy but remain unaltered in the process. Most enzymes are proteins. Some are…
THE LAWS OF ENERGY TRANSFORMATIONS
Th re are two laws of thermodynamics: First law of thermodynamics It i also called the law of energy conservation. It states that energy can neither be created nor destroyed,…
ENERGY
WHAT IS ENERGY? The capacity to do work is called energy. Work is the transfer of energy. Energy can also be transformed. For example, a plant can transform solar energy…
OBJECTIVES
Multiple Choice Questions MCQs Four options are given at the end of each statement. You should encircle one option from them. Which of the following compound is'absent in plasma membrane?…
EVOLUTIONARY RELATIONSHIPS AND TREE DIAGRAMS
saadiaEVOLUTIONARY RELATIONSHIPS AND TREE DIAGRAMS There are following problems in the interpretations of the evolutionary tree diagrams: 1. Stowing relationship above the species: The evolutionary-tree diagrams clarify evolutionary relationships and…
MODEL SUBJECTIVE QUESTION
Describe the fluid mosaic model of cell membrane. Describe different movements across the cell membrane. Write note on ribosomes. Write note on endoplasmic reticulum. Describe structure and function of Golgi…
ORGANS AND ORGAN SYSTEM
Organ The group of different tissues performing same function is called organs. Different tissues are organized into the organs except simplest animals (sponges and cnidarians). Some organs have their tissue…
Connective Tissues
The tissue with loose arrangement of cells and the cells are scattered in an extracellular matrix are called connective tissue This non living matrix consists of a web of fibers.…
TISSUES
The group of similar cells which performs same functions is called tissue. There are four types of tissues: epithelial tissues, connective tissues, muscles tissues and nerve tissues. Epithelial tissues The…