What is NOT a reason for why lipids don't dissolve well in water?
a. Lipids are rich in carbon atoms.
b. Lipids are low in oxygen atoms.
c. Lipids are essentially non-polar molecules.
d. Most all the atoms that make up lipid molecules have about the same electronegativity.
e. Lipids are hydrophobic.
In DNA, the type of bonds found in the nucleotides that join the sugar to the phosphates are?
a. ionic bonds
b. covalent bonds
d. peptide bonds
The correct answer is option c - Lipids are essentially non polar molecules
Explanation: Lipids are non polar molecules and whereas water is a polar molecule. Polar molecules dissolves in polar solvents and non polar molecules dissolve in non polar solvents. So, being non polar, lipids does not dissolve in water molecule which is a polar compound.
The correct answer is option b - Covalent bond
Explanation: Sugars and phosphate together form the backbone of DNA and they remain attached to ech other by phosphodiester bond. This is a covalent bond that is formed between carbon 4 of sugar and a CH2 group attached to the phosphate group.
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