Can you guys pretty me with my science

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

How many neutrons does a atom of cobalt have?

What type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? view available hint(s) what type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? salt bridge disulfide bridge hydrogen bond hydrophobic interaction