Scientific Discoveries 4. Watson and Crick made a successful model of DNA based on
Rosalind Franklin's X-ray studies. This indicated that DNA was
A. a 'triple helix with intertwined bases.
B. a double helix with bases outside the helix.
C. a double helix with bases inside the helix.
D. a single linear molecule of bases held together by
sugar-phosphate bonds.
Check Answer

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