3% of earth's water is actually fresh, not salty ocean water
Answer:
E. All of the above
Explanation:
In cardiac contractile cells there is rapid depolarization, then a plateau phase and repolarization.
when an action potential stimulates the cell, voltage-gated channels open quickly commencing the positive-feedback mechanism of depolarization. This in turn raises the membrane potential to approximately +30 mV, and this closes the sodium channels. Next comes the plateau phase, where membrane potential declines relatively slowly due to the opening of the slow Ca2+ channels, allowing Ca2+ to enter the cell while few K+ channels are open, leading to K+ to exit. Once the membrane potential reaches approximately zero, the Ca2+ channels close and K+ channels open, allowing the exit of K+. The repolarization lasts approximately for a while and here is when the membrane potential drops until it reaches resting levels once more and repeats the cycle.
Prokaryotes do not have a nucleus, are smaller, and reproduce quickly
eukaryotespecially have a nucleus and are larger/more complex
Answer:
Cell wall synthesis
Explanation:
Antibiotics are the compounds that work against bacteria and kills bacteria or slow their growth. Every antibiotic have their own mode of action. Beta-lactam antibiotics like penicillin and cephalosporins work on cell wall synthesis.
They stop the synthesis of peptidoglycan by inhibiting the transpeptidation reaction. So when no new cell wall is added into bacteria, holes creates in the cell wall which allows the free movement of solute inside the bacteria cell that results in osmotic lysis of the bacterial cell. Therefore the right answer is cell wall synthesis.
