The DNA double helix is composed of two strands of DNA;

each strand is a polymer of DNA nucleotides.
Each nucleotide consists of a sugar, a phosphate group, and one of four nitrogenous bases.
The structure and orientation of the two strands are important to understanding DNA replication.

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen

What does the positioning of transcription factors determine?

Which could be a pathway of food through an ecosystem