Select your answer:
Topics:
Microbio (Viruses) Cell and Muscle Histology Excretion in Humans Heart and Circulatory System Renal Replacement Therapies Medication Administration Body System Interactions The Energy Nutrients Bacteria, Viruses, and Fungi Circulatory and Respiratory System Nervous / Sensory System First Aid Check up Micro Immunology The Cardiovascular System OCR A-level Pharmacology VitaminsOther quiz:
Cell Structure and Functions › ViewWhich of the following molecules is least likely to cross a cellular membrane by simple diffusion?
A. carbon dioxide
B. nitrogen
C. potassium ion
D. water
Vitamins and Minerals › View
Mineral helps to maintain immune system healthy bones and teeth
A. Sodium
B. Iodine
C. Calcium
D. Iron