NAS2 CHALLENGE EXAM QUESTIONS AND ANSWERS UPDATED 2024/2025 GRADED A+

NAS2 CHALLENGE EXAM QUESTIONS AND ANSWERS UPDATED 2024/2025 GRADED A+. enzymes - correct answer promote chemical reactions by bringing substrates together in an optimal orientation, thus creating an ideal chemical environment for the reaction to occur always return to original state decomposition - correct answer single compound breaks down into two or more elements or new compounds These reactions often involve heat, light, electricity synthesis - correct answer multiple reactants combine to form a single product Release energy in form of heat and light (exothermic) Hydrogen and oxygen - water NAS2 CHALLENGE EXAM QUESTIONS AND ANSWERS UPDATED 2024/2025 | VERIFIED ANSWERS | GRADED A+ exchange - correct answer any class of reactions between two substances that involves an exchange of one or more ionic components (positive and negative charges) solvent - correct answer substance solute is dissolved in polar molecule - correct answer a molecule that has electrically charged areas covalent bonds - polarity if its atoms differ in electronegativity can form hydrogen bonds nonpolar molecule - correct answer cannot mix with water dissociation - correct answer leads to acidic and basic conditions physiology - correct answer science dealing with the functions of living things or their organs level of organization - correct answer living things arranged from the simplest to most complex are: organelle cells tissues organs organ systems, organism populations communities ecosystem biosphere requirements for life - correct answer Cellular organization Reproduction Metabolism Homeostasis Heredity Response to stimuli Growth and development Adaptation through evolution survival needs - correct answer Food, oxygen, water, body temperature, atmospheric pressure (oxygen/carbon dioxide exchange) homeostasis - correct answer relatively constant internal physical and chemical conditions that organisms maintain receptor - correct answer senses environmental stimulus and sends info to control center control center - correct answer hypothalamus signals effector effector - correct answer responds to stimuli example: muscle contracting negative feedback mechanisms - correct answer net effect is that the original output of the system shuts off the original stimulus or reduces the intensity homeostasis negative feedback mechanisms - correct answer most common form of homeostasis, bringing people back to normal functioning negative feedback mechanisms - correct answer example of homeostasis: adjustments of blood pressure, metabolism, body temp positive feedback mechanisms - correct answer form of homeostasis level of variable changes in same direction as initial change enhances or accelerates output created by activated stimulus positive feedback mechanisms - correct answer example of type of homeostasis: platelet aggregation or accumulation in response to injury, child birth anatomical position - correct answer erect position, face forward, arms at side, palms face forward used to describe relation to other things coronal, sagittal, transverse - correct answer 3 major planes of dissection cranial - correct answer brain body region spinal/vertebral - correct answer spinal cord body region thoracic cavity - correct answer lungs, heart, esophagus, trachea, thymus abdominal cavity - correct answer stomach, liver, spleen, gallbladder, small/large intestines, kidneys pleural cavity - correct answer contains lungs pelvic cavity - correct answer end of large intestines, urinary bladder, reproductive organs mediastinum - correct answer seperates lungs pericardial - correct answer contains heart axial - correct answer head, neck, and trunk of body appendicular - correct answer limbs electron - correct answer negatively charged particle, outer shell proton - correct answer positive, in nucleus number of protons - correct answer number of electrons is equal to the same... number of protons - correct answer atomic number is equal to... atomic mass - correct answer sum of protons and neutrons in the nucleus the weighted average mass of isotopes of an element, found below the element symbol ionic bond - correct answer chemical bond formed between two ions that are opposite charges, atom gives up one or more electrons to another atom covalent bond - correct answer sharing electron pairs between atoms polar covalent bond - correct answer pair of electrons unequally shared between two atoms nonpolar covalent bond - correct answer two atoms share a pair of electrons with each other hydrogen bond - correct answer weak bond result of attraction between proton and electronegative atom of another enzymes - correct answer catalyze chemical reactions by lowering activation energy barriers and converting substrate molecules to products substrate - correct answer reactant acted upon by an enzyme enzymes active site binds to this active site - correct answer part of an enzyme to which substrates bind and where a reaction is catalyzed the splitting of a molecule into smaller molecules, atoms, or ions, especially by a reversible process PH - correct answer measure of acidity measure of hydrogen ion concentration basic/alkaline - correct answer if pH is above 7 it is... acidic - correct answer if pH is below 7 its...