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WorksheetsLipids QB Set 1
Total questions: 30
Worksheet time: 10mins
The double bonds in the fatty acids are usually in the ____ form. Its presence increases its fluidity.
Cis
Trans
Regarding bile salts:
1. sterol ring with glycine
2. interacts with the lipid particles and aqueous duodenal contents
3. helps in the digestion of lipids
4. a fatty acid derivative
1 and 3
2 and 4
1, 2, 3
1, 2, 3, 4
Lecithin, cephalin, and sphingomyelins are classified as:
Triglycerides
Phospholipids
Cerebrosides
Neutral fats
Sterols
Regarding fatty acids (FA):
Saturated FA contains at least one double bond
Linoleic acid is said to be “essential” because mammals cannot make it and it is essential for growth
Most fatty acids exist in the body in the free form
Dietary FA are not important because mammals make enough
The class of lipids that does not contain fatty acids is
Triglycerides
Phospholipids
cholesterol
A monosaturated fatty acid contains
two double bonds
three double bonds
one double bond
all single bonds
The lipid precursor for the biosynthesis of bile salts and steroid hormones is:
Triglyceride
Phospholipids
Nonesterified fatty acids
Cholesterol
Storage form of lipids:
triglyceride
cholesterol
fatty acid
phospholipid
The lipid that serves as lung surfactant material is:
triglyceride
cholesterol
fatty acid
phospholipid
The following are true with lipids, except:
of animal or vegetable in origin
dissolve freely in non-polar solvents
insoluble in water
dissolve freely in polar solvents
Enzyme responsible for the hydrolysis of triglyceride is:
amylase
lipase
bile salts
alkaline phosphatase
The following hormones promote triglyceride catabolism, except:
lipoprotein lipase
cortisol
insulin
hormone-sensitive lipase
The following are good sources of energy, except:
cholesterol
fatty acids
triglyceride
This form of double bonds (C=C) in fatty acids are artificially produced by chemical hydrogenation:
cis
trans
Regarding trans fats:
1. produced to protect baked goods from spoilage
2. produced to harden vegetable oils into shortening and margarine
3. are found in dairy products and beef fat
1 and 2
2 and 3
1 and 3
1, 2, 3
The following are needed in the digestion of lipids, except:
bile salts
colipase
pancreozymin
salivary lipase
Triglycerides are composed of fatty acids hooked in what type of linkage to glycerol?
Acid
Ester
Aldehyde
Ketone
Alcohol
What is the function of bile in digestion?
Enzymatically hydrolyzes fats
Aids in absorption of triglycerides
Emulsifies fat droplets, increasing surface area
Provides alkaline pH for auto-hydrolysis
Stimulates pancreatic enzymes
What percent of total cholesterol is usually esterified?
none
18%
50%
70%
98%
Most of the cholesterol in the human body:
comes from dietary sources
is synthesized by the liver
circulates as free cholesterol
is converted metabolically from triglyceride
all options
In plasma, lipids are made soluble due to their combination with:
Organic solvents
Bile
Protein
Salts
The phospholipid found in highest concentration in the serum is:
Cephalin
Lecithin
Sphingomyelin
Beta-glycerophosphate
Palmitophosphate
Cell membranes are primarily composed of
Lipids, cholesterol, and carbohydrates
Lipids, cholesterol, and proteins
Lipids, nucleic acids, and proteins
Proteins, nucleic acids and carbohydrates
Proteins, cholesterol and carbohydrates
In an aqueous environment, phospholipids form ____ that have a _____ core and ____ surfaces.
Bilayers; hydrophilic; hydrophobic
Monolayers; hydrophilic; hydrophobic
Monolayers; hydrophobic; hydrophilic
Bilayers; hydrophobic; hydrophilic
Bilayers; hydrophilic; hydrophilic
A steroid has four basic...
Carbon rings
Hydroxide groups
Triple bonds
All of the above
None of the above
Phospholipids have what element in the compound?
phosphorus
phosphatine
proline
phenylalanine
Why do saturated fats pack more tightly and have a more solid consistency than unsaturated fats?
They contain more nitrogen.
They are heavier.
They are more water soluble than unsaturated fats.
They have no double or triple bonds to put kinks in the fatty acids.
This serves as the building block for triglyceride and phospholipids synthesis:
fatty acids
amino acids
cholesterol
acetate
Major site of lipid digestion and absorption:
stomach
liver
kidney
small intestine
Which of the following statements is not true:
All lipids in plasma circulate in combination with proteins
Lipids are composed of long hydrocarbon chains plus hydroxyl or ester group
Combination of lipids with proteins promotes solubility in aqueous medium
Saturated fatty acids contain double bonds between two adjacent carbon atoms
