★ Biochemistry Quiz
Which elements do organic compounds always contain?
A. Carbon and nitrogen
B. Hydrogen and oxygen
C. Carbon and hydrogen
D. Nitrogen and oxygen
Select your answer:
Topics:
Histology Body System Blood Pathology Pulse Carbohydrates / Fat-soluble Vitamins Living Organisms & Animal Behaviors Fainting and Nosebleed Mouth - Stomach The Cell Cycle & Cancer Bone Marrow Histology Kidney - Loop of Henlé Physical Therapy and Rehabilitation Macromolecules & Nutrients Bacteriology Non-Communicable DiseaseOther quiz:
Nervous System › ViewThese carry messages to and from parts of your brain.
A. blood
B. veins
C. nerves
D. arteries
Human Body › View
Which organ pumps blood?
A. Kidney
B. lungs
C. Heart
D. Veins