Question

MULTIPLE CHOICE: provide an explanation too please Lipids that are liquid at room temperature likely: (a) have only single covalent bonds between the carbon atoms (b) have a mix of single and double covalent bonds between the carbon atoms (c) are less hydrophobic than ring-lipids like cholesterol (d) are modified with sugars (e) have multiple carboxyl groups

Answer 1

The answer should be (b) have a mix of single and double covalent bond .

Explanation:-

The concept can be understood by giving an example that fats are solid while oil is liquid at room temperature.

- Fats which are mostly from animal source, have all single bonds between the carbons in their fatty acid tails, thus all the carbons are also bonded to the maximum number of hydrogen possible.

- since the fatty acids in these triglycerides contains maximum possible amount of hydrogen , thay are called saturated fats.

- the hydrocarbon chains in these fatty acids are thus straight and can be packed closely together, making these fats solid at room temperature.

- oils:-

- oils have some sources , have some double bonds between some of the carbons in the hydrocarbon tail, causing bends in the shape of the molecules.

- because some of the carbon share double bonds , they are not bonded to as many hydrogen as they could if they were not double bonded to each other. So they are called unsaturated fats.

- Because of the bends in the hydrocarbon tails, unsaturated fats can't be packed closely enough , making them liquid.

Hopefully it helps, thanks.