abida Archive

MODEL SUBJECTIVE QUESTION

What are elements? Give major and trace element. What is atom? Give its structure. Write note on isotopes. What are energy levels or shell? How many shells are present in the atoms? Give examples. Write note on hydrogen bonding. Write note on acid, base

DEFINITIONS AND KEY POINTS

TERMS DEFINITIONS Matter Anything that occupies space and               has mass is called Mass The amount of matter in an object is called Mass Element The     chemical      substances     that     in   ordinary     chemical reactions cannot break down into simpler units are called element.      

IPIDS ENERGY, INTERFACES, AND SIGNALS

L•ds are nonpolar organic molecules that are insolubfr- in polar water but s luble in nonpolar organic solvents like ether, alcoh( , and chloroform. P ospholipids and cholesterol are lipids. They are important constituents of cell m mbranes. The most common lipids in animals

CARBOHYDRATES

STORED ENERGY AND STRUCTURAL SUPPORT Polyhydroxy aldehyde or ketones are called carbohydrate. Carbohydrates are major source of energy for animals. Most animal cells have chemical machinery. It breaks down the energy rich carbon hydrogen (C-H) bonds. Simple carbohydrates (e.g. monosaccharide) are composed of atoms

HE MOLECULES OF ANIMALS

The molecules present in the animals are called organic molecules. The portant groups of organic molecules in animals include carbohydrates, lipids, oteins, nucleotides, and nucleic acids. There are two types of molecules. Organic molecules: They contain carbon atoms. Inorganic molecules: They lack carbon atoms

ACID,BASES AND BUFFERS

Electrolytes A substance that conducts electricity in solution form is called electrolyte. Its example is sodium chloride (NaCI). Many fluids contain strong electrolytes hat break down (ionize) into ions. Most acids and bases are electrolytes. cid n acid is a substance that releases hydrogen

ENERGY LEVEL SHELLS

The electrons of an atom are distributed around its nucleus in orbital called energy-level shells or clouds of electrons. Location of these electrons greatly influences reactions. Seven energy level shells are possible. Each shell can hold only a certain number of electrons. The shell

THE CHEMICAL BASIS OF ANIMAL LIFE

Atoms and Elements: Bui’Jing block of all matter, compounds molecules: Aggregate of atoms, Acids, Bases and Buffers, The molecules of Animals, Fractional account of Carbohydrates, Lipids, Proteins , Nucleotides, and nucleic acids based on the structural aspects. Matter Anything that occupies space and has

DEFINITIONS AND KEY POINTS

Write note on genetic unity. Discuss cell as a unit of life. Discuss evolutionary oneness and diversity of life. Write note on different energy sources. Discuss chlids as an example of study in biology. Describe scientific method. Multiple Choice Questions MCQs Four options are