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TOSSUP 1) BIOLOGY Multiple Choice Which of the following statements about cellular signaling is true? W) Paracrine signaling involves electrical signals triggering neurotransmitter secretion. X) In humans, pheromones affect selection of potential mates. Y) Paracrine signaling use hormones for long-distance signaling. Z) Growth factors are one class of local regulators used in paracrine signaling. Answer: Z) Growth factors are one class of local regulators used in paracrine signaling. TOSSUP 2) BIOLOGY Multiple Choice What kind of membrane receptor, used primarily in the nervous system, is used to generate an action potential? W) G-protein linked receptors X) Receptor tyrosine kinases Y) Voltage-gated ion channels Z) Ligand-gated ion channels Answer: Y) Voltage-gated ion channels TOSSUP 3) BIOLOGY Multiple Choice Which of the following statements about chemical signaling false? W) Calcium ions are more widely used than cAMP as a second messenger X) G proteins usually directly affect cellular functions Y) The conversion of ATP to cAMP is catalyzed by adenylyl cyclase Z) Drugs such as sidenafil citrate inhibit the hydrolysis of cGMP to GMP Answer: X) G proteins usually directly affect cellular functions TOSSUP 4) BIOLOGY Short Answer What blood cells produce the immune response against foreign antigens and have receptors consisting of Y-shaped molecules made up of 4 polypeptide chains? Answer: B cells (prompt on lymphocytes) TOSSUP 5) BIOLOGY Short Answer What hormone, produced by the pineal gland and involved in biological rhythms is regulated by light and dark cycles? Answer: Melatonin TOSSUP 6) BIOLOGY Short Answer They provide structural support for neutrons and regulate the extracellular concentrations of ions and neurotransmitters. They also induce the formation of tight junctions between cells that line the capillaries in the brain and spinal cord, creating the blood-brain barrier. Name these types of glial cells, named for their star-like shape. Answer: Astrocytes TOSSUP 9) CHEMISTRY Multiple Choice Which of the following statements about quantum numbers is not true? W) As the principal quantum number of an electron increases, so does its energy. X) The azimuthal quantum number of an electron determines the shape of its orbital Y) The spin projection quantum number of an electron can be 1 Z) The magnetic quantum number describes subshells Answer: Y) The spin projection quantum number of an electron can be 1 TOSSUP 10) GEOLOGY Multiple Choice In earthquakes, what type of surface wave is characterized by a rolling motion along the ground surface? W) Rayleigh waves X) Love waves Y) P-waves Z) S-waves Answer: W) Rayleigh waves TOSSUP 11) COMPUTER SCIENCE Multiple Choice Which programming language was designed by IBM in the 1950s for scientific and engineering uses? W) ALGOL X) Fortran Y) C++ Z) C# Answer: X) Fortran TOSSUP 12) PHYSICS Short Answer What laboratory method is used for separation of mixtures? Answer: Chromatography TOSSUP 13) PHYSICS Short Answer What law states that any two electrons cannot possess the same 4 quantum numbers? Answer: Pauli exclusion principle TOSSUP 14) PHYSICS Short Answer The phenomenon when a superconductor lowered below its critical temperature exhibits no magnetic field is called what? Answer: Meissner effect TOSSUP 15) PHYSICS Short Answer What type of magnetism is the property of an object which causes it to create a magnetic field in the presence of an externally applied magnetic field? Answer: Diamagnetism
