BIO1102 Lecture 3 2023 (1) PDF

BIO1102 - Lecture 3 The Web of Life - What is life? (Biological) Calvin R. Bernard NOTE: Some images used in this presentation do not belong to the author and therefore is only used here for illustration purposes und...

BIO1102 - Lecture 3 The Web of Life - What is life? (Biological) Calvin R. Bernard NOTE: Some images used in this presentation do not belong to the author and therefore is only used here for illustration purposes under ‘fair use.’ Do 13 September 2023 not share or display beyond the class. Outline The Origin of life Characteristics of living things The kingdoms of life The ‘living dead’  Objectives At the end of this lecture students will: – Be able to broadly define life – Be able to identify the various major hypotheses on the origin of life – Discuss the main characteristics of living organisms – Be able to correctly adjudge if a thing is dead or alive based on its characteristics What is life? Where and how did it start? Life is a state of being defined by a set of characteristics. Theories of how life started Most widely accepted in Science Extraterrestrial origin Spontaneous origin Less accepted in science American Committee for the Weizmann Institute of Science, 2020 Intelligent design Deemed widely unscientific Special creation  Characteristics Some dead things seem alive – Viruses, organics, crystals Some living things seem dead – Corals Defining characteristics of living things must therefore make a clear distinction between these groups – Forget some of what you learned in primary and high https://imgur.com/gallery/mvEDD school? Characteristic # 1 Organization Living matter is organized into complex structures based on organic molecules. https://sphweb.bumc.bu.edu/otlt/mph- modules/ph/ph709_basiccellbiology/ph709_basiccellbiology8.html Characteristic # 2 Homeostasis Living matter maintains some type of homeostasis (internal balance). Characteristic # 3 Growth and development Living matter increase in size and complexity. https://kscorn.com/research/ks-corn-research-funding- research-corn-growth-and-development-poster-available- image/ Characteristic # 4 Reproduction passing genetic material Living matter reproduces and passes on genetic material as a blueprint for growth and subsequent reproduction From Garvan Institute of medical Research Characteristic # 5 Transforms energy and matter Living matter acquires matter and energy from the external environment and converts it into different forms. Characteristic # 6 Response to stimuli Living matter responds to stimuli from the environment Question A complete form of living matter is referred to as an _______________. (an eight-letter word) The living dead Viruses http://programmingbulls.com/bad-good-viruses