BIOL 1P91 Final Exam Questions And Verified Solutions

BIOL 1P91 Final Exam Questions And Verified Solutions What are the 3 general components that make up an atom? - ANS Protons Neutrons Electrons The sum of the atomic number and the number of neutrons is: - ANS A (the atomic number) Mass Number Which of the following is/ are a polar bond? A) O-H bond in water * B) C-O in CO2 C) N-N in N2 D) all of the above E) two of the above - ANS A) O-H bond in water A substance dissolvable in oil is said to be: - ANS Hydrophobic - since oil is hydrophobic, it will dissolve hydrophobic substances - like dissolves like Amphipathic molecules have two different properties: When dissolved in water, they form: - ANS Amphipathic molecules have hydrophobic and hydrophilic properties and in water they form micelles. A pH of 2 is ________ than a pH of 6 - ANS 10,000 times more acidic -more acidic the lower you go Which of the following macromolecules is the most hydrophobic? A) Lipids B) Proteins C) Carbohydrates D) Nucleic Acids E) All of the above F) 2 of the above - ANS Lipids are the most hydrophobic - water hating What is the following reaction? R1-OH + H-R2 --> R1-R2 + H20 A) Hydrolysis B) Condensation C) Dehydration D) Decomposition E) All of the above F) 2 of the above - ANS Two of the above: Hydrolysis and Condensation - they both lose a water to combine molecules What are the 4 molecules in all living organisms - ANS Hydrogen Oxygen Nitrogen Carbon Which macromolecule contains a sulphydryl functional group? A) Fatty acids B) Carbohydrates C) Steroids D) Amino acid - ANS Amino Acids - this is a -SH group that is specifically found in cysteine What kind of bonds connect sugar monomers - ANS Glycosidic bonds How do plants store energy? - ANS Starch - starch is for plants - glycogen is for animals Which protein structure involves the formation of a 3D shape due to R-group interactions? - ANS Tertiary What are the three types of movement across a membrane? - ANS -Diffusion (passive transport down the concentration gradient) - Facilitated Transport ( movement down a concentration gradient using a protein) -Active Transport (movement against the concentration gradient without the input of energy and the aid of a protein) The protein that moves lipids from the outer leaflet to the inner leaflet of the membrane - ANS Flippase - Scramblase (Random) - Flippase (Out to in) -Floppase (In to out)