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DNA Structure, Replication, Proteins › View

What is the role of helicase in DNA replication?

A. It forms the DNA backbone.

B. It breaks the hydrogen bonds between nitrogen bases.

C. It adds new bases to the DNA strand.

D. It splits the DNA into two cells.

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Diagnostics and Pathology Reports › View

Which is NOT an early sign of breast cancer?

A. Lumps in the breast

B. Change of shape or size of the breast

C. Feelings of repeated nausea

D. Skin changes on or around the breast

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