Test Bank for Essential Cell Biology 3rd Edition Alberts

CHAPTER 2 CHEMICAL COMPONENTS OF CELLS 2009 Garland Science Publishing 3 rd Edition Chemical Bonds 2-1 If the isotope 32S has 16 protons and 16 neutrons, how many protons and how many neutrons will the isotope 35 S has? 2-2 A. If 0.5 mole of glucose weighs 90 g, what is the molecular weight of glucose? B. What is the concentration, in grams per liter (g/l), of a 0.25 M solution of glucose? C. How many molecules are there in 1 mole of glucose? 2-3 Which of the following elements is LEAST abundant in living organisms? (a) Sulfur (b) Carbon (c) Oxygen (d) Nitrogen (e) Hydrogen 2-4 Your friend learns about Avogadro’s number and thinks it is so huge that there may not even be a mole of living cells on Earth. You have recently heard that there are about 50 trillion (50 × 10 12) human cells in each adult human body, so you bet your friend $5 that there is more than a mole of cells on Earth. Once you learn that each human contains more bacterial cells (in the digestive system) than human cells, you are sure that you have won the bet. The human population is now more than 6 billion (6 × 10 6 ). What calculation can you show your friend to convince him you are right? 2-5 Atoms form covalent bonds with each other by