Nucleic acids. They contain a phosphate base and a nitrogen group.
<span>There are numerous proteins in muscle. The main two are thin actin filaments and thick myosin filaments. Thin filaments form a scaffold that thick filaments crawl up. There are many regulatory proteins such as troponin I, troponin C, and tropomyosin. There are also proteins that stabilize the cells and anchor the filaments to other cellular structures. A prime example of this is dystrophin. This protein is thought to stabilize the cell membrane during contraction and prevent it from breaking. Those who lack completely lack dystrophin have a disorder known as Duchene muscular dystrophy. This disease is characterized by muscle wasting begininng in at a young age and usually results in death by the mid 20s. The sarcomere is the repeating unit of skeletal muscle.
Muscle cells contract by interactions of myosin heads on thick filament with actin monomers on thin filament. The myosin heads bind tightly to actin monomers until ATP binds to the myosin. This causes the release of the myosin head, which subsequently swings foward and associates with an actin monomer further up the thin filament. Hydrolysis and of ATP and the release of ADP and a phosphate allows the mysosin head to pull the thick filament up the thin filament. There are roughly 500 myosin heads on each thick filament and when they repeatedly move up the thin filament, the muscle contracts. There are many regulatory proteins of this contraction. For example, troponin I, troponin C, and tropomyosin form a regulatory switch that blocks myosin heads from binding to actin monomers until a nerve impulse stimulates an influx of calcium. This causes the switch to allow the myosin to bind to the actin and allows the muscle to contract. </span><span>
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<span>The correct answer is c. In terms of energy storage, glycogen is to animals what starch is to plants.</span> Glycogen is a form of energy storage in animals and it is the main storage of glucose in the body. <span>Starch also have a large number of glucose units and it is produced by plants.</span>
Answer:
Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later used to fuel cellular activities. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide.
Plants, algae, and a group of bacteria called cyanobacteria are the only organisms capable of performing photosynthesis
Explanation:
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In autotrophic bacteria, chlorophyll is located in the infolded regions of the plasma membrane.
Autotrophic bacteria are those that can synthesize their own food. The energy can be derived either from sunlight or from chemical reactions. Only a few amount of bacteria are autotrophic. The examples of such bacteria are: green sulfur bacteria, purple sulfur bacteria, heliobacteria, etc.
Chlorophyll is the green colored pigment involved in the process of photosynthesis. The chlorophyll acts as a reaction center that absorbs the energy from sunlight to initiate the process of photosynthesis. The energy absorbed by other pigments is also transferred to the reaction center.
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