Mains Paper II · 3 Science & Technology · APPSC Group 2
3.1 Living world, cell and genetics notes
5 notes, in reading order.
- 3.1.1Classification of living organisms and the world of microbes
Living things are named with a two-part Latin name and grouped into kingdoms and domains by cell type and nutrition, and microbes (viruses, bacteria, fungi, protozoa, algae) are the smallest and most numerous groups, both useful and harmful.
Advanced · 6 min · Free in the app - 3.1.2Cell: structure, organelles and cell division
The cell is the basic unit of life; each organelle has a job, and cells multiply by mitosis (for growth) or meiosis (for gametes).
Advanced · 6 min · Free in the app - 3.1.3Biomolecules and enzymes: carbohydrates to nucleic acids
Carbohydrates, lipids, proteins and nucleic acids are the four classes of large biomolecules; enzymes are protein catalysts that speed up the reactions of life.
Advanced · 6 min · Free in the app - 3.1.4Mendel's laws and patterns of inheritance
Mendel showed that traits are passed on by discrete factors (genes) that separate and recombine in predictable ratios, and later work added exceptions such as incomplete dominance, multiple alleles and linkage.
Advanced · 6 min · Free in the app - 3.1.5DNA, chromosomes, sex determination and genetic disorders
DNA is a double helix that carries the code for proteins through RNA, and changes in genes or in chromosome number cause inherited disorders such as haemophilia, sickle-cell anaemia and Down syndrome.
Advanced · 6 min · Free in the app
Practise Living world, cell and genetics. Questions with answers explained, from the same topics.
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