How are nucleic acids classified?
Whether viruses contain DNA
Whether the viruses contain RNA
Whether the nucleic acid is single or double stranded
Whether the nucleic acid is linear or circular
All of the above

Which of the following diseases may be transmitted through an accidental needle stick? a. syphilis b. tuberculosis c. cellulitis d. hepatitis b

Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?

Vessels draining the myocardium of the heart, open primarily ,into which chamber?