Biology 30 Exam 3 Questions And Answers Rated 100%!!!

Which type of amino acid side chains can form ionic bonds? - ANS Acidic and basic Which type of proteins have quaternary structures - ANS Proteins that associate with other proteins/subunits Alpha helices are part of which protein structure? - ANS Secondary Which amino acids can be phosphorylated? - ANS Only amino acids with a terminal -OH group If a kinase enzyme phosphorylates a protein, what effect on function do you expect? - ANS Either an increase or a decrease in the protein's activity Unlike humans, sheep can digest cellulose. Which of the following statements must be true. A. Sheep can't digest starch B. Sheep must be more evolved than humans C. Sheep must have an enzyme that can break the β 1-4 covalent bond D. All statements are false - ANS C Which cytoskeleton component(s) can be assembled and disassembled quickly? - ANS Actin Filaments and Microtubules Which organelle(s) participate in protein folding? - ANS Golgi Complex and Rough E.R. Which shape will have the lowest surface area to volume ratio? - ANS Sphere Cells that specialize in nutrient absorption have a low ________ ratio - ANS surface area to volume Which type of lipid composition would requre the greatest amount of energy to pull into microvilli? - ANS Membrane with a high concentration of cholesterol To make microvilli, what is not necessary? - ANS Intermediate filaments The cell membbrane and the Endoplasmic Reticulum have the same lipid composition A. True B. False - ANS B If you wanted the smallest diameter tube which types of lipids should you use? - ANS Rigid Increased epinephrine in the blood stream will lead to increased ___________ production and decreased _________________ production - ANS glucose - 1 - phosphate; glycogen The release of 1 epinephrine molecule in the bloodstream will lead to the release of how many glucose molecules from the liver on average? - ANS 1,000,000 Epinephrine modifies its receptor covalently A. True B. False - ANS B Epinephrine can cross the cell membrane A. True B. False - ANS B After Protein Kinase A (PKA) phosphorylates the enzyme phosphorylase kinase how does phosphorylase kinase become inactive again? - ANS A phosphatase enzyme removes the phosphate group The relationship between squid and V. fischeri is an example of what two types of relationships? - ANS Mutualistic and Symbiotic Which of the following conditions is the negative control for the bioluminescence of baby Hawaiian bobtail squid exposed to seawater samples experiment? - ANS Sterile seawater only When do expect V. fischeri to exhibit maximum luminescence? - ANS Living in the squid at ~10% maximum density or greater Why might bacteria that grow on a chronic catheter in the hospital be especially hard to kill? - ANS They produce a protective biofilm Which type of organisms are most likely to form a biofilm? Bacteria, Archaea, and Fungi growing in ___________ density - ANS High When do slime mold cells aggregate into a multicellular organism? - ANS When food is scarce What signaling molecule is used to direct slime mold cells to aggregate? - ANS cAMP Does cell size perfectly predict genome size? - ANS No Increasing the number of _______________ can help large cells overcome diffusion limitations - ANS copies per gene Pseudogenes - ANS Used to be functional genes, but they have mutated and no longer encode functional proteins Prokaryotes are usually bigger than eukaryotes A. True B. False - ANS B If you expose cells to an electrical field, the membrane proteins will move towards the ____________ pole - ANS Positive You are studying a spherical cell. Given that sphere volume = 4/3 π r3 and sphere surface area = 4 π r2, will cell volume increase faster or surface area? - ANS Cell volume