The number of g-molecule of oxygen in 6.02 x 1024CO molecules is A. 1 gram of molecule B. 0.5 gram of molecule C. 5 gram of molecule D. 10 gram of molecule
Answer: Option D Whatever the formula of a certain substance, a mole of it will always contain 6.022x10^23 molecules. Thus, 6.02x10^24 molecules of any substance contains 10 moles of it, whether it is CO2, CO, or even DNA.
How different are intracellular and extracellular digestion? What is the evolutionary advantage of extracellular digestion?
During intracellular digestion, the breaking down of macromolecules takes place within the cell. During extracellular digestion, macromolecules are broken down in places outside the cell (in the extracellular space, in the surrounding area, in the lumen of digestive tracts, etc.) The evolutionary development of extracellular digestion allowed organisms to benefit from a greater variety of foods. The breaking down of larger molecules into smaller ones outside the cell permitted the use of other foods that, due the size of their molecules, could not be interiorized by diffusion, phagocytosis or pinocytosis.
Which sentence is correct? a. I didn't get some apples. b. I haven't got any time. c. There's any milk in the fridge.
The correct answer is option b. I havent got any time.