Answer:
ribosomes
Explanation:
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The answer is binary fission.
This happens when during the replication of chromosomes of prokaryotes. Similar to mitosis, it divides itself and reproduces asexually. Many bacteria use this kind of process to produce more of this kind of organism in equal sizes.
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This is referred to as allopatric speciation where species are separated geographically and evolve into two different species over time
Answer:
by the sarcoplasmic reticulum's calcium ion pumps
Explanation:
Rigor mortis or postmortem rigidity, is a state caused by chemical changes in the muscles that occur post mortem and cause the limbs of the corpse to stiffen.
This occurs because after death, there is no cellular respiration and consequently, no oxygen nor ATP (ATP is required for the muscle relaxation).
Calcium enters the cytosol after death because it is released due to the deterioration of the sarcoplasmic reticulum and due to the breakdown of the sarcolemma. Ca2+ ions activate the formation of actin-myosin cross-bridging necessary for the contraction. Muscles are unable to relax, because myosin heads continue to bind with the active sites of actin and there is no ATP to destabilize the myosin-actin bond.
