You explain to a friend what you have learned about Avogadro's number. Your friend thinks the number is so large that he doubts there is even a mole of living cells on the Earth
You have recently heard that there are about 50 trillion (5 × 1013) human cells in each adult human body and that each human contains more bacterial cells (in the digestive system) than human cells, so you bet your friend $5 that there is more than a mole of cells on Earth. The human population is approximately 7 billion (7 × 109). What calculation can you show your friend to convince him you are right?
Avogadro's number, or 6 × 1023, is the number of atoms (or units) in a mole. If you multiply the number of people on Earth by the number of cells in the human body, then double it to account for the bacteria, you will calculate: (7 × 109) × (1 × 1014) = 7 × 1023. Thus, even when only considering the human population and the associated microbial populations, you can estimate more than a mole of living cells on Earth. You win $5.
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A.) side chains of both amino acids B.) carboxyl group of one amino acid and side chain of the other C.) amino groups of both amino acids D.) carboxyl groups of both amino acids E.) amino groups of one amino acid and carboxyl group of the other F.) amino group of onw amino acid and side chain of the other
At current (2007) rates of consumption, and given current estimates of known reserves, the predicted length of time to exhaustion of world oil supplies is about ____ years.
Fill in the blank(s) with the appropriate word(s).