Bio 1P91 Midterm October Verified Questions & Correct Answers | Expert- Solutions | Latests update

Bio 1P91 Midterm October Verified Questions & Correct Answers | Expert- Solutions | Latests update elements of the scientific method - ANSWER characterization, generate hypothesis, experimentation, intemperate results an accepted hypothesis is aka - ANSWER theory Law or principal - ANSWER Accepted by overwhelming majority of scientists What do e- shells represent - ANSWER Energy state of an atom In water ionic bonds - ANSWER Dissociate Types of bonds - ANSWER Ionic, covalent, H bonds, vander wasps forces Electronegativity - ANSWER Atom's ability to attract and hold electrons. High EN - ANSWER Oxygen, nitrogen, sulfur Low EN - ANSWER hydrogen and carbon Biological systems usually consist of which type of bonds - ANSWER C-H Carbone surrounded by H is a - ANSWER Hydrocarbon Hydrophobic - ANSWER Non-polar and water is repulsed Hydrophilic - ANSWER Polar and water is attracted Phospholipids in a cell membrane have - ANSWER A charged (-) head and non polar c-h tail. Hydrophobic inside membrane and hydrophilic parts outside. H in a water faces the charged heads and O2 the other way What type of bonds do water molecules make with each other - ANSWER Hydrogen bonds Vanderwaals forces - ANSWER Weaker than H bonds. Develop non polar molecules or non polar regions. Can briefly stabilize molecules. E- are shared equally but at individual times may not be Bases are proton - ANSWER acceptors Acids are proton - ANSWER donors Cell theory - ANSWER All organisms composed of 1 or more cells Carry out all essential life processes What do viruses lack - ANSWER Enzymes and must infect a living thing to reproduce Transmitance e- microscopes - ANSWER Thin or ultra thin segments bombarded by e- structures scatter and e- appear dark Scanning e- microscopes - ANSWER Beam of e- scatter across whole cell or organism to visualise surface Plasma membrane - ANSWER Desperate inside and outside of cell and is selectively permeable lipid balayer - ANSWER Prevents water solvable subst from crossing Transport protein and channels - ANSWER Allow some subst to cross membrane