The cautions that can be given to the friend include the following:
Eating foods from different sources is very advantageous because it ensures that one gets all the necessary food nutrients that are needed for proper growth and development. Getting the necessary food nutrients on the other hand will boost one's immunity and enable one to develop resistance to diseases. Restricting one's food to a limited type of food is very bad and can have fatal consequences.
It should be 1000x which is the total magnification of the whole thing... I believe. Would you happen to be doing a microscope quiz
it allows for nutrients to come into the cell using passive tranport aka moving anything on a gradient without the use of energy (ATP).
The unique - tertiary structure of the enzyme is what makes it unique - this in combination with the receptors at the active site confer specificity.
