Will s Pre-Test This is a representative of Exam I that you will take Tuesday September 18, 2007. The actual exam will be 50 multiple choice questions. (1) The basic structural and functional unit of the human body is: a) protein. b) the cell. c) tissue. d) the organ. e) the organ system (2) The maintenance of a relatively constant internal environment in is termed: a) Positive Feedback b) Homeostasis c) Negative Feedback d) Homeopathy e) Osmosis (3) Which of the following is an organ? a) Mitochondria b) Blood c) Fat d) Skin e) Cardiac Muscle (4) A collection of cells that work together to perform a function is termed a(n): a) Organelle b) Organ c) Cell d) Tissue e) Prison (5) An atom tries to fulfill its outmost shell; this is called: a) the atom rule b) VESPR theory c) octet rule d) Atomic Law e) valence (6) Water has a dipole moment between its Hydrogen and Oxygen; this results in a: a) polar covalent bond b) non-polar covalent bond c) hydrogen bond d) ionic bond e) octet bond
(7) Which is not one of the four main elements in the human body: a) Carbon b) Sodium c) Nitrogen d) Hydrogen e) Oxygen (8) The most important metabolic fuel molecule in the human body is: a) sucrose b) lactose c) galactose d) glucose e) maltose (9) Fructose and Glucose are examples of: a) polymers b) monomers c) unomers d) singles e) dimers (10) Which of the following has a negative charge? a) an atom. b) a molecule. c) a proton. d) neutrons. e) electrons. (11) Which of the following is NOT a true bond, but is only a weak electrical attraction between adjacent molecules? a) ionic bond b) covalent bond c) hydrogen bond d) metallic bond e) James Bond (12) The elements C:H:O in a carbohydrate usually occurs in a ratio of: a) 2:1:2 b) 1:2:1 c) 3:1:1 d) 2:1:1 e) 1:1:2
(13) A dipeptide bond is formed between: a) 2 peptides b) 2 amino acids c) three polypeptides d) carboxyl groups e) 2 glucose molecules (14) An α-helix is part of a proteins a) primary structure b) secondary structure c) tertiary structure d) quaternary structure e) Β-Pleated Sheet (15) Two amino acids are joined together by the process of: a) dehydration synthesis/ condensation b) hydrolysis c) ionization d) exchange reaction e) transfer reaction (16) An unsaturated fatty acid differs from a saturated fatty acid in that it contains: a) a string of carbons b) a hydrogenated carbon chain c) at least one carbon-carbon double bond d) an amino group (17) Cholesterol is an example of: a) a carbohydrate b) a protein c) nucleic acid d) lipid e) both B and C (18) Proteins contain a which differentiates them from the other 20 amino acids a) amino group b) R-group c) carboxyl group d) chiral carbon
(19) The speed of an enzymatic reaction is influenced by all of the following EXCEPT for: a) temperature b) ph c) substrate concentration d) enzyme concentration e) all of the above (20) Once an enzyme-substrate solution passes a certain temperature limit, the enzymatic reaction will begin to slow down because of: a) enzyme denaturation b) competitive inhibition c) loss of substrate compatibility d) enzyme reactions never slow down e) non-competitive inhibition (21) Nearly all of the work performed in a cell requires the catabolism of to provide energy a) vitamins b) fats c) enzymes d) ATP e) starch (22) Which of the following is NOT a function of membrane proteins? a) They bind to specific extracellular molecules to trigger a cellular change. b) The regulate the passage of ions. c) They are carrier molecules for various solutes. d) The serve as anchors or stabilizers for the cell membrane. e) They are used as a source of energy. (23) Cell membranes are said to be a) impermeable. b) freely permeable. c) selectively permeable. d) actively permeable. e) none of the above. (24) The movement of water across a membrane from an area of low solute concentration to an area of higher solute concentration is known as a) osmosis. b) active transportation. c) diffusion d) facilitated diffusion. e) filtration.
(25) A phospholipid contains a polar and non-polar region which makes it a) hydrophobic b) hydrophilic c) ionic d) amphiphilic e) hydrosystic (26) Side to side movements of phospholipids are more common than flip-flopping because: a) flip-flopping requires moving a greater distance. b) flip-flopping requires the fatty acid tails to separate from the phosphate head. c) flip-flopping involves coordinated movements of two phospholipids d) phospholipids are hydrophilic. e) phospholipids have both hydrophilic and hydrophobic parts. (27) A competitive inhibitor prevents an enzyme from working properly by a) permanently changing enzyme b) changing active site c) temporarily changing enzyme d) temporarily blocking active site (28) Water molecules and small ions enter a cell through a) channels in some cell membrane proteins b) receptor proteins c) lipid channels d) anchor proteins (29) Major source of energy for a cell comes from a) ATP b) ADP c) Pi d) Water (30) The sum of all chemical reactions in the human body is referred to as a) catabolism b) satabolism c) anabolism d) metabolism