Question

17) All of the following are characteristics of saturated fats EXCEPT:

 A) they are usually solid at room temperature.

 B) they contain at least one double bond.

 C) they are found in animals.

 D) their fatty acids pack tightly together.

 E) they are used to store energy. 

18) All of the following are characteristics of phospholipids EXCEPT:

 A) they are found in cellular membranes.

 B) they can form micelles and bilayers.

 C) they contain fatty acids which associate with water.

 D) they contain a hydrophilic phosphate "head." 

 E) they contain two fatty acids and a phosphate functional group. 

19) All of the following are uses of carbohydrates in organisms EXCEPT:

 A) as a component of cell walls.

 B) as a long-term energy source.

 C) as a short-term energy source.

 D) to keep membranes flexible at low temperatures.

 E) as a building block of DNA and RNA molecules. 

20) Which of the following types of lipids can be used to keep some microorganisms from drying out?

 A) steroids

 B) saturated fats

 C) unsaturated fats

 D) polyunsaturated fats

 E) waxes

Answer 1

QUESTION: 17

ANSWER: (B)

The characteristics of saturated fats such as

• Saturated fats are normally solid at room temperature. Some saturated fats are solid at the refrigerator and become flabby solid at the room temperature and become liquid while cooking.
• Saturated fats are profoundly found in animals and plants.
• Saturated fatty acids are stored tightly together and because of this some saturated fats hard in nature.
• Saturated fatty acids are used to store energy and help later to convert it into an energy form. It stores in the form of glycogen and converts into glucose during the need for energy.

Saturated fatty acids only hold a single covalent bond within the carbon atoms and every carbon atom adheres to two hydrogen atoms.

QUESTION: 18

ANSWER: (B)

Phospholipids are the significant elements of the cellular membranes. Phospholipids comprise two alcohol and one or two fatty acids. Phospholipids include two hydrophobic fatty acid tail and one hydrophilic phosphate head. Phospholipids receive fatty acid which is correlated with water. These are the properties of phospholipids. Phospholipids designs bilayers which have two hydrophobic chains which support to persist in the property. Phospholipid does not produce micelles. Micelles are produced by a fatty acid. So it is not the characteristic of fatty acid.

QUESTION: 19

ANSWER: (B)

Carbohydrates in organisms are used as short term energy but not as long term energy. Fatty acids are used for long term energy. Carbohydrates are used as a component of the cell wall. Nucleic acids and carbohydrates act as a building block of DNA and RNA molecules. Also, carbohydrates keep the membranes flexible at room temperature.

QUESTION: 20

ANSWER: (D)

Polyunsaturated fatty acids are compared to continuing some microorganisms from drying out. The other lipids such as steroids, saturated and unsaturated fatty acids are not relating to this. Saturated and unsaturated fatty acids are used for the regulation of good and bad cholesterol. Steroids are essential in the organisation of hormones.