number of chromosomes in each nucleus. Humans have 46. Somatic cells (non reproductive cells) have two sets of chromosomes in most plants and animals. (Humans have two sets of 23) Gametes (reproductive cells: sperm and eggs‚ and spores) have hals as many chromosomes as somatic cells. (All of our gametes have 23 chromosomes) Eukaryotic chromosomes consist of chromatid‚ a complex of DNA and protein that condenses during cell division. Eukaryotic cell division consists of:
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groups) Task 1 (U21:P1P2) 23/09/13 and 03/02/14 Task 2 (U21:M1) 30/09/13 and 10/02/14 Task 3 (U21:D1)07/10/13 and 24/02/14 Scenario / Vocational Context To reduce the risk of infectious disease it is important to determine the source of infection and routes of transmission‚ strategies to control infection can then be put in place. Our bodies have defence mechanisms that can destroy infection and restore health. Task 1 Submission Date – 23/09/13 and 03/02/14 This
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Unit 2 – Evolution Steps Leading Up to Charles Darwin’s Theory ü Around the world‚ there is an enormous diversity of life Each species has its own set of characteristics Arctic animals – have characteristics that help them survive in the cold‚ harsh environment Desert animals – have characteristics that help them survive in the extreme heat ü Theory is a set of statements that explains a group of facts or phenomena Tested repeatedly and supported by evidence Can be used to make predictions
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Section * Methodology * Abstract * Introduction * Pre Publication * The First Edition o Darwin’s Theory * The Second Edition * The Third Edition o Owen’s Criticism Page 5 5 6 7 12 12 15 16 16 Contents Oxbridge Essays 2 www.oxbridgeessays.com o Saltationism o The Age of the Earth o The Advancement of Organisation * The Fourth Edition o Hybrid Sterility o Perpetuation of Variation o Absence of Intermediate Types in the Fossil Record
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Lecture 2 Macromolecule components of cells I Chapter 5 Dr Ahmed Aldarmahi Assistant Professor College of Medicine – Jeddah Lecture Objectives • Distinguish between monosaccharides‚ disaccharides and polysaccharides. • Distinguish between saturated and unsaturated fats. • Describe phospholipids and steroids. Glossary • • • • • • • MonoDiPolyMacroPolymer Phospholipids Steroid Overview: The Molecules of Life • All living things are made up of four classes
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Name _____________________________ Regents Biology Period _________ Date ______________________ LAB ____. ANATOMICAL EVIDENCE OF EVOLUTION In our studies of the anatomy and development of animals we have discovered that many living creatures that look quite different on the surface have similarities underneath their skin that suggest that they are related to each other. This is evidence that living creatures have evolved‚ or gradually changed over time. In this lab‚ you will learn about homologous
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Chapter 4 Microscopes Two important factors in microscopy are: 1) Magnification: an increase in the object’s apparent size compared with its actual size. 2) Resolving Power: the ability of an optical instrument to show two objects are separate. Three types of microscopes: 1) Light Microscope (LM) M: 1000x RP 0‚2 micrometer (small bacterial cell) 2) Electron Microscope (EM) uses a beam of electrons to resolve electrons‚ better resolving powers than light microscope M:100‚000x RP 0
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Patterns of Evolution Humans alter our environment to suit our needs rather than adapt to our environment based on environmental stressors. Due to this fact‚ we are unlikely to be affected by the pressures of natural selection. We will not likely be affected by further evolution. In convergent evolution‚ unrelated species living in the similar environments become more and more alike in appearance as they adapt to the same kind of environment. Dolphins and sharks are examples of convergent
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Animal Diversity The number of animal varieties familiar to us is vast as the animal world is diverse. Each distinct variety or type of animals is recognized by scientist as a species. Animals of most species are free-living forms but of others are parasitic in bodies of other animals or even plants. According to their habitats animals are divided into the following types Aquatic animals :- They live in water . Animals living in sea water are called marine & those live in river‚ponds‚streams
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6a. Urbanization refers to much more than simple population growth; it involves changes in the economic‚ social and political structures of a region. Rapid urban growth is responsible for many environmental and social changes in the urban environment. The rapid growth of cities strains their capacity to provide services such as energy‚ education‚ health care‚ transportation‚ sanitation and physical security. *3 Urbanization transforms societal organizations‚ the role of the family‚ demographic structures
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