01:119:116 Lecture Notes - Lecture 5: Symmetry In Biology, Blastomere, Hox Gene
22 Apr 2016
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Document Summary
Different from autotrophic plants and different from heterotrophic fungi who feed by absorption. Consumers need producers for raw materials and energy. Ingest food and then digest it inside body. Multicellular eukaryotic + like plants and most fungi. Lack cell walls different from plants and most fungi. Collagen most abundant protein (not found in plant/fungi) Cells specialised to perform specific function (ex. neurons) Group of cells with a common structure and act as a functional unit (ex. epithelium) Specialised structure made up of tissues (ex. kidneys) Adapted to perform a specific function or group of functions. Ability to move and conduct nerve impulses. Usually sexual with diploid stage dominating life cycle. Meiosis produces haploid sperm and egg. Fertilisation small flagellated sperm fertilises large immobile egg zygote. Cleavage: zygote undergo a series of mitotic divisions (no cell growth) Blastula: hollow ball of cells with inner cavity called blastocoel. Gastrulation: embryo folds inward, expands, and fills blastocoel. Directly into adults some animals do.
