Migration signaling Study guides, Revision notes & Summaries

1. What is the neural crest? Where does it arise? What is the role of EMT in neural crest cell (NCC) formation? ANSWER: The neural crest is where our neural tube forms from the neural crest arises from the ectoderm and gives rise to peripheral nervous system 2. Briefly explain the relationship of BMP and Shh signaling to NCC specification; what critical TFs do NCCs express? Why do those TFs matter? ANSWER: Neural Crest is specified at a moderate level of bmp signaling at low end (=ne...

True / False 1. There are many more neurons than glia in the nervous system. ANSWER: DIFFICULTY: KEYWORDS: False Easy Factual ANSWER: DIFFICULTY: KEYWORDS: False Easy Factual a. b. True False 2. Microtubules are the largest type of fibers found in the neural cytoskeleton. ANSWER: DIFFICULTY: KEYWORDS: True Moderate Factual a. b. True False 3. Mitochondria are responsible for the production of proteins in the neural cell body. a. b. True False 4. Bipolar neurons have two branches ...

NBME 26 Questions Answered 100% correct 2023 How can the jejunum be distinguished from the ileum? (5) 1. inner mucosal folds (plicae circulares) are more prominent, more numerous, and taller --> (this leads to increased mucosal SA and associated feathered appearance after the administration of oral contrast material) 2. larger caliber, thicker muscular walls 3. longer vasa rectae 4. fewer arcades 5. the ileum is notable for the presence of Peyer patches and mucosal lymphoid fo...

AP Biology Unit 8 Ecology Exam Review Questions already solved 2023Identify two behavioral changes in an organism due to an internal cue. Sensation of hunger results in seeking out food, Identify two behavioral changes in an organism due to an external cue. MIgration-circannual rhythm using the sun to track their position, fiddler crab mating in response to full and new moon Identify two physiological changes in an organism due to an internal cue. Release of histamine triggers...

MCMP 442 Final Exam Questions and Answers 100% Pass Which of the following statements is FALSE regarding the adaptive immune system or the innate immune response? a. The adaptive system responds before the innate response during an infection b. Somatic recombination only occurs in the adaptive response and NOT in the innate response c. The adaptive response will produce proteins that bind more specifically to a pathogen compared to the innate response d. The innate response involves the...

MCAT Biology -Exam 2023 Abductor - Answer-a muscle that moves a limb away from the center of the body Absorption - Answer-the process by which substances are taken up intro or across tissues Acetylcholine - Answer-a neurotransmitter found thought the nervous system (somatic motor neurons, preganglionic parasympathetic, and sympathetic neurons); metabolized by acetylcholinesterase Acrosome - Answer-the large vesicle at the head of a sperm cell containing enzymes that degrade the ovum ...

Coevolution Event The process by which two or more species evolve in tandem by exerting selection pressures on each other Speciation Event A lineage-splitting event that produces two or more separate species. Phylogenetic Event The evolutionary development and history of a species or higher taxonomic grouping of organisms. Also called phylogenesis. The evolutionary development of an organ or other part of an organism Homology Event Shared trait among species Mutat...

MMSC490 Practice Exam 1|123 Questions with Verified Answers cytoplasmic organelles are: a. absent in prokaryotic cells and present in eukaryotic cells. b. present in both prokaryotic and eukaryotic cells. c. present in prokaryotic cells and absent in eukaryotic cells. d. absent in both prokaryotic and eukaryotic cells. - CORRECT ANSWER a. absent in prokaryotic cells and present in eukaryotic cells E. coli is a useful model system for molecular biology studies because: a. it has a smal...

Both audible and visual alarm indication shall be supervised - ANSWERTrue Speakers are permitted for voice communication only - ANSWERFalse Private Mode audible signal appliance minimum sound level of - ANSWER45 dBA at 10' -- 10 dBA above average, 5 dBA above maximum sound level; whatever is greater measured at 5' above floor. A signal indicating an emergency requiring immediate action is an - ANSWERalarm signal Where Public Mode audible appliances are installed they shall be _____...

NBME 30 Questions Answered 100% correct 2023 56 y/o F comes to physician 3 wk hx increasing weakness of arms and legs. - Smoking - Weakness of hip girdle muscles, lesser weakness of shoulder girdle muscles. - Weakness improves with repetitive testing. - Hilar lung mass What's impaired: - Acetylocholinesterase - Binding of ACh on postsynaptic membrane - Direct depolarization of muscle by Ca - Postsynaptic membrane potential - Presynaptic release of ACh Presynaptic release of ACh ...