Do you find that all living beings need the same kind of food?

Why do organisms need to take food ?

Where do you find haversian system ?

Do you think that the alternate splicing of exons may enable a structural gene to code for several isoproteins from one and the same gene? If yes, how? If not, why so?

a) What property do all elements in the same column of the periodic table as boron share? b) What property do all elements in the same column of the periodic table as fluorine share?

Rewrite each of the following statements in the form ''p if and only if q'' q: For you to get an A grade, it is necessary and sufficient that you do all the homework regularly.

What property do all elements in the same column of the Periodic Table as boron have in common?

What property do all elements in the same column of the Periodic Table as fluorine have in common?

The atomic numbers of two elements are 8 and 16 respectively. Write the electronic configuration of these two elements. Do you keep these two elements in the same group of the modern periodic table? Justify your answer. Find out which of these two elements is more electronegative. Give reason for your answer.