BSCI 124 Exam I Guide

BSCI 124 Exam I Guide - BSCI124ExamIGuide Lecture 1 What is...

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BSCI 124 Exam I Guide 01:54 Lecture 1 What is science? Knowledge about the natural world A technique, a way of seeking principles about the world. Verified through experiments. The Scientific Method: Observation o New observations are made and previous data is observed o Hypothesis o Input from various sources use to make a testable statement Tests or experiments to obtain data Hypothesis is tested by experiments and/or further observations Data Interpretation Conclusions o The results are analyzed and hypothesis is either supported or rejected. Theory: hypothesis that has survived many tests and other competing hypothesis have failed Law: proven theory without any disapproving evidence.
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What is life? [All living things share:] Highly organized Maintain stable composition Respond to stimuli Grow and develop Reproduce Variations based on heredity Evolve and adapt What is a plant? Multicellular organism Cellulose-rich cell wall Chlorophyll and are photosynthetic Adapted to life on land (descended from land plants) Plant Structure: Shoot: usually grows above o Flowers Specialized shoot where reproduction occurs: fruits and seeds develop
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o Leaves Site of photosynthesis: blade, petiole o Node Place in the stem where a leaf is attached o Stem Holds leaves, transports water & nutrients. Provides support above ground Root: usually grows below o Anchor the plant to the soil. o Absorb water and mineral nutrients. o May serve as storage in some species o Branch roots, root hairs, root cap. Variations in plant structure: o Some stems grow underground Potato o Celery: an overgrown leaf petiole o Storage roots: radish, yams o Modified leaves: spines of cactus Plant Growth Intermediate growth is totally different from animals Shoot & root apical meristems: region of embryonic tissue capable of developing new parts of the plant.
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Lecture 2- The Cell Life’s Molecules Carbon-based Formed from elements C, H, U, P, N Modular construction (like bldgs) Function depends on structure o Carbohydrates Organic molecule composed of C H O Most abundant of molecules Three Types Monosaccharides Glucose, fructose, ribose Disaccharides Composed of two monosaccharides Sucrose, maltose, lactose Polysaccharides Long chains of monosacch. Starch-energy storage
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Cellulose-plant cell walls Function: Energy storage (C-H bond) Structure in plants (cellulose for cell wall) Carbon sources to make other molecules (nucleic acids, amino acids) o Lipids Composed of C H O Fats and oils made from building blocks Fats Solid lipids (no double bonds-straight) Oils Liquid lipids (double bonds-crooked) Waxes Glycerol molecule Fatty Acids Steroids Structurally different from other lipids Composed of 4 Phospholipids
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This note was uploaded on 11/30/2010 for the course BSCI 124 taught by Professor Moctezuma during the Spring '08 term at Maryland.

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BSCI 124 Exam I Guide - BSCI124ExamIGuide Lecture 1 What is...

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