The nucleus is the 'brain' of a eukaryotic cell and controls all the activities of the cell. It contains most of the genetic information of the cell, in the form of DNA molecules, and is enclosed within a membrane, the nuclear membrane.
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-Payshence
Answer:
The condensed chromatin indicates that A is prophase
Explanation:
Answer:
cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin
Explanation:
The signal for the beginning of muscle contraction is acetylcholine (Ach) released from the presynaptic cell which then binds to its receptor on the muscle cell. This event causes depolarization and consequently the release of Ca ions from the sarcoplasmic reticulum. Ca helps the formation of actin-myosin cross bridge. The movement of myosin heads causes the move of actin and this process is called power stroke. In the absence of ATP, the myosin head will not detach from actin(ATP binding causes the myosin head to detach from the actin and causes cross bridge dissociation). Energy released form the ATP hydrolysis changes the myosin head into a cocked position.
Cells are part of of all living things.If we didn’t have cells we wouldn’t be able to define whether something is alive or not. Cells make tissue in the body too and tissue makes organs like your brain, heart, liver, spleen & stomach so therefore without them we wouldn’t exist.
There might be no food or places to live!