Asked by Andy Blackwell Uncategorized
Is Troponin made of multiple globular moecules to form lom long chains or filaments?
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Which star would be the brightest star in an ancient globular cluster?
Asked in Health, Biology, Muscular System
What is the structure of actin?
Actin is essentially a ball ('globular') with two key features: 1. a particular region binds and hydrolyzes adenosine triphosphate (ATP); 2. Other regions allow actin molecules to bind to one another head-to-tail. I won't discuss the ATP hydrolysis here. When actin molecules bind each other, they form a spiral-staircase-like ('alpha-helical') string called a 'filament.' Multiple actin filaments come together to form bundles or fibers. These higher-order structures are so big and so prevalent that they can be seen in living cells through a microscope. The atomic structure of globular actin is available for free here: http://www.ncbi.nlm.nih.gov/Structure/mmdb/mmdbsrv.cgi?uid=47984
What defines a sarcomere?
A sarcomere is the basic unit of a striated muscle. In humans, each muscle is composed of multiple bundles of muscle fibers or cells. Each fiber is comprised of myofibrils. In between sarcomeres lies the z line or the z disc. When strained, the z line appears dark with a distinct border. In the z lines, thin filaments reach toward the center, and overlap. These filaments all represent the structures of the sarcomeres.
How do you change tail light 97 Chevrolet suburban?
Two screws inside the tail gate jam. Then the fun part. Pry with fingers or something that won't scratch the paint the tail light out (Forward). try not to break anything :). Good thing is the bulbs are interchangeable an they have multiple filaments in them. I was able to swap mine around for some bulbs with unused filaments. Check all lights after replacement of course. Don't want to make your brake lights work and then your turn signal not work.
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