1) The percentage of elements found in the human body (Oxygen 65.0%, Carbon 18.5
ID: 81240 • Letter: 1
Question
1) The percentage of elements found in the human body (Oxygen 65.0%, Carbon 18.5%, etc.) is similar to the percentages found in other organisms. Explain why this is so
2) When an overnight freeze is predicted, farmers may spray water on their crops to protect them.Using the properties of water, explain how spraying water on crops would protect them fromfreezing conditions.
3) Explain what an enantiomer is, and give an example of why they are important to drugmanufacturers and pharmacists.
4) How do the cell and its organelles provide evidence that plants and animals have a commonorigin?
5) Why would adding salt to soil be harmful for crops?
6) Sprinkling particles of ascorbic acid on a cut apple prevents it from browning. Explain why this is so.
7) In the 1930s, dinitrophenol (DNP) was prescribed to induce weight loss. This was discontinuedwhen some patients died. DNP makes the inner mitochondrial membrane leaky to H+ ions.Explain how DNP caused weight loss, and in some cases, death.
8) A gray rooster and a gray hen produce 15 gray, 6 black, and 8 white hens. What is the mostlikely pattern of inheritance for this character? How do these results support the theory thatinheritance is particulate (i.e. Mendelian) as opposed to blending (i.e. pre-Mendelianinheritance theory)?
9) When comparing mitochondrial DNA from related species, every third nucleotide is more likelyto differ than the other two, e.g. AATGCG and AACGCA. Why is it that the third nucleotide ismore frequently mutated than the first two?
Explanation / Answer
1 Ans. The percentage of elements found in the human body is similar to the percentages found in other organisms. This could be accounted for because we evolved in the same environment, from the same elements and similar biochemistry i.e., they all have proteins, DNA, RNA, lipids, and most have very similar energy carriers (such as ATP, GTP) and metabolites (glucose, citric acid, etc).
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