DIT 121 - EXAM 2 WITH 100% CORRECT
ANSWERS { GRADED A+}
What are the 3 main classes of lipids? - ✔✔triglycerides: the most common type
of lipid in food and the body
phospholipids: for example, in cell membranes
sterols: include cholesterol, vitamin D, some hormones.
what is the main form of fat in the diet and the major storage form of fat in the
body? - ✔✔triglycerides
what 2 types of molecules (and how many of each) join together to forma
triglyceride? - ✔✔glycerol + 3 fatty acids
explain what is meant by saturated, monounsaturated, and polyunsaturated when
referring to fatty acids. - ✔✔monounsaturated: fatty acids have 1 double bond
between carbons
polyunsaturated: fatty acids have 2 or more double bonds between carbons
, saturated: no double bonds
omega-3 fatty acids - ✔✔have the 1st double bond after the 3rd carbon, counting
from the methyl (CH3) group
omega-6 fatty acid - ✔✔have the 1st double bond after 6th carbon, counting from
the methyl group
which type of fatty acids (saturated or unsaturated) tend to make fats solid at room
temperature? - ✔✔saturated: saturated with hydrogens
unsaturated: not saturated with hydrogen, can hold more hydrogen
which types of fatty acids (saturated/unsaturated) tend to make fats liquid soft at
room temperature - ✔✔saturated fatty acids stack together, make fats solid at
room temperature: animal fat, bacon grease, lard, chicken fat, butter
unsaturated fatty acids: dont stack neatly, making fats soft or liquid at room
temperature: avocado, fatty fish, nuts and seeds, olives, vegetable oils.
what is hydrogenation, and why is this done to the oils in processed foods? -
✔✔hydrogenation produces trans-fatty acids; "trans-fat" are oils to which H
atoms have been added.
ANSWERS { GRADED A+}
What are the 3 main classes of lipids? - ✔✔triglycerides: the most common type
of lipid in food and the body
phospholipids: for example, in cell membranes
sterols: include cholesterol, vitamin D, some hormones.
what is the main form of fat in the diet and the major storage form of fat in the
body? - ✔✔triglycerides
what 2 types of molecules (and how many of each) join together to forma
triglyceride? - ✔✔glycerol + 3 fatty acids
explain what is meant by saturated, monounsaturated, and polyunsaturated when
referring to fatty acids. - ✔✔monounsaturated: fatty acids have 1 double bond
between carbons
polyunsaturated: fatty acids have 2 or more double bonds between carbons
, saturated: no double bonds
omega-3 fatty acids - ✔✔have the 1st double bond after the 3rd carbon, counting
from the methyl (CH3) group
omega-6 fatty acid - ✔✔have the 1st double bond after 6th carbon, counting from
the methyl group
which type of fatty acids (saturated or unsaturated) tend to make fats solid at room
temperature? - ✔✔saturated: saturated with hydrogens
unsaturated: not saturated with hydrogen, can hold more hydrogen
which types of fatty acids (saturated/unsaturated) tend to make fats liquid soft at
room temperature - ✔✔saturated fatty acids stack together, make fats solid at
room temperature: animal fat, bacon grease, lard, chicken fat, butter
unsaturated fatty acids: dont stack neatly, making fats soft or liquid at room
temperature: avocado, fatty fish, nuts and seeds, olives, vegetable oils.
what is hydrogenation, and why is this done to the oils in processed foods? -
✔✔hydrogenation produces trans-fatty acids; "trans-fat" are oils to which H
atoms have been added.
