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The major macromolecules that make up cells are

In a human pedigree that traces the inheritance of sickle cell disease, a half-filled circle represents a

Cystic fibrosis is autosomal recessive. This means that_________

Apoptosis is a form of

Which of the following acts as a quality control center for cells?

Meiosis is necessary because otherwise

What type of chemical makes up a gene? 

Gram-negative bacteria are characterized by having an external lipid layer with a thin layer of _______ followed by the plasma membrane.

The evolution of aerobic life forms was made possible as cyanobacteria released _________ into the atmosphere.

Angiosperms differ from most organisms in their method of fertilization. A zygote and endosperm are produced in an event known as _________ fertilization.