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

Strongylocentrotus purpuratus
Arabidopsis thaliana
Xenopus laevis
Saccharomyces cerevisiae

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DNA Structure and Replication
In DNA, there are

only two bases known as adenine and cytosine
five bases known as adenine, guanine, thymine, tryptophan and cytosine
three bases known as adenine, guanine and cytosine
four bases known as adenine, guanine, thymine and cytosine

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