0
What else can I help you with?
Do actin filaments have membranes?
No, actin filaments do not have membranes. They are composed of actin protein subunits and are involved in providing structural support and facilitating movement within the cell, but they are not enclosed within a membrane themselves.
DO actin and myosin come from muscle fiber?
Yes, actin and myosin are protein filaments found within muscle fibers. Actin is responsible for thin filaments and myosin for thick filaments in muscle contraction.
What are the filaments of a dynamic skeleton?
The filaments of a dynamic skeleton are the structures within a cell that provide support and enable movement. These filaments include actin filaments, microtubules, and intermediate filaments, which work together to maintain cell shape, transport organelles, and facilitate cell motility. They are constantly being assembled and disassembled in response to cellular signals.
What is the difference between microtubules and actin filaments?
The cytoskeleton itself is made up of microtubules, the only difference being size and function. Microtubule is solely support of the physical arrangement of the cytoskeleton, and the cytoskeleton protects the site from outside invaders or forces.
What are several ways proteins are used?
Proteins are used for making structures in cells including actin filaments, spectrin tetramers, and intermediate filaments. Proteins are packaged into vesicles (protein-carrying sacks) at the Golgi aparatus and are then shipped off. Things called motor proteins attach to the vesicles and transport them across the network of microtubules (highway-like structures) towards the centrosome (the center of the microtubule network). The vesicles will at some point turn inside out, spilling all the proteins they contained. These proteins will float away and be used for construction the structures. In simpler text, proteins are used to make the structures inside of a cell such as actin filaments, spectrin tetramers, and intermediate filaments. For info on these structures, just Google them.
What is Sliding microtubule hypothesis?
The sliding microtubule hypothesis explains how cargo (such as amino acids and other small molecules) travel down the minus end of the microtubules (towards the nucleus) by a pair of dynein arms. These dynein arms periodically project out from the peripheral microtubule doublet.
What separates one sarcomere from the next?
Z-lines separate one sarcomere from the next within a myofibril. These are structures composed of actin filaments where thin filaments from adjacent sarcomeres are anchored.
How do you explain the presence of actin in two distinct subcellular pools of protein?
The presence of actin in two distinct subcellular pools can be explained by its dynamic nature and functional versatility. One pool may consist of monomeric actin (G-actin) that is readily available for polymerization, while the other pool comprises filamentous actin (F-actin) that forms stable structures like microfilaments in the cytoskeleton. This dual distribution allows for rapid remodeling and adaptation to cellular needs, such as motility, shape changes, and signaling. Additionally, regulatory proteins and signaling pathways can influence the balance between these pools, enabling precise control over actin dynamics.
Which cytoskeletal element is NOT correctly associated with its characteristics?
C. Centrioles are found in the microtubule organizing centers of plants.
What structure helps anaphase?
Centriole or microtubule organizing center .
What is a part of cytoskelton?
cytoskeleten provide the skeletol function in the cell, and it composes from intermediat filament, actin filament and microtubule. It provides the structural backbone and movement of the cell
What structures do the cross bridges attach during muscle action?
actin
Do actin filaments have membranes?
No, actin filaments do not have membranes. They are composed of actin protein subunits and are involved in providing structural support and facilitating movement within the cell, but they are not enclosed within a membrane themselves.
What are the structures within the muscle fiber that shorten to cause skeletal muscle fiber contraction?
The structures within the muscle fiber that shorten to cause skeletal muscle contraction are called myofibrils. Myofibrils are composed of repeating units called sarcomeres, which contain thick and thin filaments made of proteins (actin and myosin). When the muscle fiber is stimulated by a nerve impulse, the myosin heads interact with the actin filaments to generate the force required for muscle contraction.
DO actin and myosin come from muscle fiber?
Yes, actin and myosin are protein filaments found within muscle fibers. Actin is responsible for thin filaments and myosin for thick filaments in muscle contraction.
What cell structures cause cyclosis?
Cyclosis, also known as cytoplasmic streaming, is mainly driven by the contractile proteins actin and myosin. These proteins interact to create a sliding motion that moves organelles and cytoplasm within the cell. In plant cells, cyclosis is often facilitated by the presence of actin filaments and myosin motor proteins.
Do Sarcomeres produce actin and myosin?
Sarcomeres do not produce actin and myosin. Actin and myosin are protein filaments that are found within sarcomeres and are responsible for muscle contraction. Sarcomeres contain organized arrangements of actin and myosin filaments that slide past each other during muscle contraction.
