Biology Proctored Exam Penn Foster Questions And Answers 100% Verified

Biology Proctored Exam Penn Foster Questions And Answers 100% Verified Characteristics of living things - answer-All are composed of cells -All obtain energy and use it to develop -Can sense changes in the environment and adjust in response to change -Exhibit modifications that represent adaptations to their environment Levels of Biological Organization - answeratom, molecule, organelle, cell, tissue, organ, organ system, organism How are organisms classified? - answeron the basis of their evolutionary/genetic relatedness What is the scientific method? What is it's importance in biological sciences? - answerProcess used to validate observations while minimizing observer bias It's goal is for research to be conduced in a fair, unbiased and repeatable manner. The best way to discover how and why the world works What is matter? - answerAnything that has mass and takes up space What is an atom? - answersmallest unit of matter that retains all the chemical properties of an element. They combine to form molecules which then form into a solid, gas or liquid What is the structure of an atom? - answerNucleus in the center that contains protons (positively charged) and neutrons (no charge). The outermost region is called an electron shell that contain the electrons (negatively charged) What is an ionic bond? - answerA chemical bond that's formed when an atom transfers and electron to another Atom What is a covalent bond? - answerResults when 2 atoms share electrons in order to have a completed outer shell What is a double covalent bond? - answerOccurs when 2 atoms share 2 pairs of electroms In order to be an organic molecule it must contain what? - answerCarbon and hydrogen What are the main groups of organic molecules that build cells and their parts? - answerCarbohydrates, proteins, lipids, nucleic acid What are the properties of water? - answerIts attraction to polar molecules. High-specific heat. High heat of vaporization. The lower density of ice. High polarity. Carbohydrates - answerBroken down to glucose to provide energy. What are the different kinds of carbs? - answerGlucose= monosaccharide that serves as blood sugar Sucrose= disaccharide which is table sugar Polysaccharides= include starch, which stores energy in plants Glycogen= stores energy in animals Cellulose= makes up the structure of plant cell walls Protein - answermacromolecule that contains carbon, hydrogen, oxygen, and nitrogen; needed by the body for growth and repair Lipid - answerEnergy-rich organic compounds, such as fats, oils, and waxes, that are made of carbon, hydrogen, and oxygen. Serve as a long term energy source Nucleic acid - answermacromolecule containing hydrogen, oxygen, nitrogen, carbon, and phosphorus Form DNA which acts to store genetic information What is the cell theory? - answerAll living organisms are made up of cells The cell is the smallest structural and functional unit of all living organisms All cells arise from pre-existing cells Ribosome - answerMakes proteins Endoplasmic Reticulum - answerA cell structure that forms a maze of passageways in which proteins and other materials are carried from one part of the cell to another. Smooth ER - answerMakes lipids