Question

TRUE/FALSE, Write 'True' if the statement is true and 'False if the statement is false. A partially false statement 15 considered false. 1) Lipids do not dissolve in water because their molecules are polar. 2) Atoms that belong to the same element always have the same number of protons in their nuclei Natural selection causes mutations in organisms. Buffers maintain a neutral pH in solutions. Amino acids are the building blocks of DNA and RNA. Hydrocarbons are nonpolar because carbon and hydrogen have similar electronegativities. A carbon atom double-bonded to anything cannot be a chiral carbon. Saturated fats pack more efficiently than unsaturated fats, because saturated fats have double bonds in their hydrocarbon portion. 9) Shivering when it is cold is an example of a negative feedback mechanism. A chiral carbon is covalently bonded to four different elements or functional groups. 11)_ In substances with ionic bonds an electron is completely transferred from one atom to the other, so there is no sharing of electrons between them. The properties of evaporative cooling and expansion of water during freezing are caused by the same chemical bonds. 13) _Water is a macromolecule. 14) Water has a higher specific heat than methanol. You heat two identical containers, one with methanol, and the other with an equal volume of water, in such a way that both containers absorb the same amount of energy. The water will heat faster than the methanol.

Answer 1

1.Lipids do not dissolve in water because their molecules are polar. False, Lipids are nonpolar molecules

2.Atoms that belong to the same element always have the same number of protons in their nuclei. True. But they can have different number of neutrons

3.Natural selection causes mutation in organisms. False. Mutations are random situations

4.Buffer maintain a neutral pH in solutions. False, buffers maintain the pH that you choose to have. It will depends on the experiment and the required pH.

5.Amino acids are the building blocks of DNA and RNA. False. Amino acids are the building block of proteins

6.Hydrocarbons are nonpolar because carbon and hydrogen have similar electronegativities. True

7.A carbon atom double-bonded to anything cannot be chiral carbon. True

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