DNA Structure and Replication
Which of the following species lack a 'classical' histone H1?

Saccharomyces cerevisiae
Xenopus laevis
Strongylocentrotus purpuratus
Arabidopsis thaliana

ANSWER DOWNLOAD EXAMIANS APP

DNA Structure and Replication
The higher order structure of DNA shows symmetry, whereas the higher order structures of most proteins do not. Why isn't protein shape more regular like DNA?

Some S amino acids cause proteins to bend; others cause protein to flatten.
DNA has one main function in cells whereas proteins have many.
All of these
The many different amino acid R groups on proteins confer many different shapes.

ANSWER DOWNLOAD EXAMIANS APP