Q: What can prevent the passage of molecules and ions between cells, such as in the blood-brain barrier? Choices: - fatty junctions - solid junctions - special junctions - tight junctions A:
tight junctions

Q: In what process is atp created by glycolysis, without oxygen? Choices: - sedimentation - oxidation - condensation - fermentation A:
fermentation

Q: Which structure includes sugar-phosphate "backbones", composed of alternating phosphate groups and deoxyribose sugars, and nitrogenous bases? Choices: - molecule double helix - mulecular triplex - dna triple helix - dna double helix A:
dna double helix