Answer:
cell membrane controls the transfer of materials inside and outside the cell.
Answer:
External factors include physical and chemical signals. Growth factors are proteins that stimulate cell division. – Most mammal cells form a single layer in a culture dish and stop dividing once they touch other cells. Two of the most important internal factors are kinases and cyclins.
Potable water or improves drinking water, is water that is safe to drink or to use for food preperation, without risk of health problems
Characteristics of potable water are:
Cleaned of harmful 1.contaminants
2.it is transparent
3.its ordorless and colorless
4.its harmless and free of disease causing bacteria
Answer:
Scientists at the Scripps Institution of Oceanography at UC San Diego, who study the phenomenon, say the glow shows are most lively at least two hours after sunset.
Explanation:
Two main factors that affect enzyme activities are temperature and pH value.
Every type of enzymes has their own optimum temperature and pH, where they work the fastest at.
for temperature, if the temperature is too low for the enzyme, they may become inactive, they work slow. Give them their suitable temperature they'll work fast again.
However, if the temperature is too high, the enzyme would be denatured. You cannot use them again.
Denatured enzymes means the enzymes already changes shape of the active site and can no longer bind into substrates and therefore no longer works, no matter if you provide the suitable environment again.
For pH, the concept is same, unless if the pH value is too extreme than the optimum pH, the enzyme will be denatured instead of being inactive.
