Bio 1P91 Midterm Exam Study Questions with Complete Solutions elements of the scientific method - Correct Answer characterization, generate hypothesis, experimentation, intemperate results an accepted hypothesis is aka - Correct Answer theory Law or principal - Correct Answer Accepted by overwhelming majority of scientists What do e- shells represent - Correct Answer Energy state of an atom In water ionic bonds - Correct Answer Dissociate Types of bonds - Correct Answer Ionic, covalent, H bonds, vander wasps forces 1 / 4
Electronegativity - Correct Answer Atom's ability to attract and hold electrons.High EN - Correct Answer Oxygen, nitrogen, sulfur Low EN - Correct Answer hydrogen and carbon Biological systems usually consist of which type of bonds - Correct Answer C-H Carbone surrounded by H is a - Correct Answer Hydrocarbon Hydrophobic - Correct Answer Non-polar and water is repulsed Hydrophilic - Correct Answer Polar and water is attracted 2 / 4
Phospholipids in a cell membrane have - Correct 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 - Correct Answer Hydrogen bonds Vanderwaals forces - Correct 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 - Correct Answer acceptors Acids are proton - Correct Answer donors Cell theory - Correct Answer All organisms composed of 1 or more cells Carry out all essential life processes 3 / 4
What do viruses lack - Correct Answer Enzymes and must infect a living thing to reproduce Transmitance e- microscopes - Correct Answer Thin or ultra thin segments bombarded by e- structures scatter and e- appear dark Scanning e- microscopes - Correct Answer Beam of e- scatter across whole cell or organism to visualise surface Plasma membrane - Correct Answer Desperate inside and outside of cell and is selectively permeable lipid balayer - Correct Answer Prevents water solvable subst from crossing Transport protein and channels - Correct Answer Allow some subst to cross membrane Cytosol - Correct Answer Aq solution containing dissolved ions and organic molecules. Highly organized w many things to hold it together
- / 4