Energy Transformations Part A Which of these is exhibiting kinetic energy? an archer with a flexed bow a space station orbiting Earth a rock on a mountain ledge a person sitting on a couch while watching TV the high-energy phosphate bonds of a molecule of ATP Correct Kinetic energy is energy of motion. Part B “Conservation of energy”… Read More »
Cellular Responses Part A The cleavage of glycogen by glycogen phosphorylase releases _____. glucose-1-phosphate galactose-1-phosphate nothing: glycogen phosphorylase cannot cleave glycogen fructose-1-phosphate cellulose Correct Glycogen is a polysaccharide composed of glucose monomers. Part B Epinephrine acts as a signal molecule that attaches to _____ proteins. G-protein-linked receptor nuclear receptor receptor tyrosine kinase intracellular receptor ion-channel receptor Correct Epinephrine… Read More »
Build a Signaling Pathway Part A Which of these is a logical signal transduction pathway? An ion-channel receptor opens, allowing a steroid hormone to enter the cell; the steroid hormone then activates protein kinases that convert GTP to GDP, which binds to an intracellular enzyme that carries out a response. A receptor tyrosine kinase activates adenylyl cyclase, which… Read More »
Signal Transduction Pathways Part A Which of these acts as a second messenger? B C E D A Correct This is a second messenger. Part B Which of these is responsible for initiating a signal transduction pathway? A B C D E Correct This is a signal molecule. The attachment of a signal molecule to a… Read More »
Reception Part A Which of these receptors is NOT a membrane receptor? D A B C E Correct This receptor is not associated with the plasma membrane. Part B Which of these is a G-protein-linked receptor? C A B D E Correct This is a G-protein-linked receptor. Part C Which of these is a receptor tyrosine kinase?… Read More »
Overview of Cell Signaling Part A Which of these is a receptor molecule? D E A C B Correct This is a receptor molecule. Part B A signal transduction pathway is initiated when a _____ binds to a receptor. G protein calmodulin tyrosine kinase cyclic AMP signal molecule Correct The binding of a signal molecule to a… Read More »
Part A Pancreatic cells, which secrete a large amount of digestive enzymes, are labeled with radioactive leucine and then chased for several hours with nonradioactive leucine. Photographic emulsions are prepared at different times during the chase. Where would the black spots appear on an emulsion prepared 3 hours after the pulse? Secretory vesicles Rough ER Exterior of the… Read More »
Metric System Review Part A 1 meter = _____ centimeters. 1,000,000 1,000 1,000,000,000,000 100 1,000,000,000 Correct A centimeter is 1 hundredth of a meter.
http://www.nytimes.com/2012/09/16/health/research/scientists-make-progress-in-tailor-made-organs.html?_r=0 Part A Where do scientists obtain adult stem cells? skin saliva bone marrow pancreas SubmitMy AnswersGive Up Correct Part B Ideally, the best scaffold for growing a replacement tissue or organ would be made of what? extracellular matrix cotton plastic silicon SubmitMy AnswersGive Up Correct Part C In order to best eliminate the chance for rejection, a tissue or organ should… Read More »
Part A Pancreatic cells, which secrete a large amount of digestive enzymes, are labeled with radioactive leucine and then chased for several hours with nonradioactive leucine. Photographic emulsions are prepared at different times during the chase. Where would the black spots appear on an emulsion prepared 3 hours after the pulse? Secretory vesicles Rough ER Exterior of… Read More »
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