Answer:
The sliding filament theory is the illustration that how the contraction of muscles takes place in order to generate force. At the start of the process, the motor neuron instigates an action potential or impulse to pass down a nerve cell to the neuromuscular junction. This activates the sarcoplasmic reticulum, which discharges calcium into the cells of the muscles.
When calcium comes within the muscle cells, it combines with troponin, thus, permitting the binding of actin with myosin. The actin and myosin bind with each other and form cross-bridges, which further contracts by utilizing ATP as the source of energy.
ATP is manufactured again, thus, permitting actin and myosin to sustain their strong binding condition. Relaxation takes place when stimulation of the nerve ceases. Calcium is then moved back within the sarcoplasmic reticulum dissociating the association between the actin and myosin.
The actin and myosin go back to their unbound condition making the muscle to relax.
Hello! Your answer is B, the chromosomes must replicate.
Meiosis is a process which takes one diploid cell (46 chromosomes) and makes 4 haploid cells (23 chromosomes). In order to do this, the DNA must divide. This is because it takes 46 chromosomes, to make 4*23 chromosomes, or 92.
We see here that the amount of chromosomes must double before meiosis. This therefore means A is incorrect, as the DNA only needs to duplicate 2 times. This also proves B correct, as the replication of chromosomes is what we're looking for.
C and D are incorrect, as they are actual processes in meiosis, meaning they do not happen before.
Hope this helps!
A nucleus. Prokaryotic cells don't contain this nor other specialized organelles.
Its estimated that during sprint events approximately 95% of energy production comes via the anaerobic system (85% phosphate, 10% anaerobic glycolysis), and only 5% from aerobic oxygen. Thus, the 100m sprint is an anaerobic event relying heavily on energy supply from the ATP-PC system!
Answer:
All of the following processes require the cell to use ATP energy, except passive transport. The correct option among all the options that are given in the question is the third option or option "passive transport". I hope that this is the answer that you were looking for and it has actually come to help you.
Explanation:
