Triglycerides Vary With Respect To The Number Of
Triglycerides vary with respect to the number of……
(a) hydrocarbon tails.
(b) C atoms in the tails.
(c) double bonds in the tails.
Both (b) and (c).
All of the above.
Answer: Both (b) and (c).
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Bio Exam 2 | 2023 | Biology-Lipids Test Answers
1) Which lipid is most amphipathic?
A phospholipid consists of a highly polar (charged) head and two nonpolar tails.
2) Why is it important for your body to process HDL cholesterol more effectively than LDL cholesterol for good health?
Answer: LDL cholesterol is known for being stored in the body, while HDL cholesterol is typically broken down and removed. When the level of LDL cholesterol exceeds that of HDL, it suggests that the body is holding onto excess cholesterol. This excess can lead to the clogging of arteries, thereby increasing the risk of heart disease.
3) The molecule shown here probably ———- Phospholipids.
A phospholipid, which shares structural similarities with fats, is notably amphipathic and partially composed of fatty acids. While closely related to fats, this difference renders them amphipathic, enabling them to serve as fundamental components of membranes.
4) What does cholesterol have in common with sex hormones?
4 linked rings.
5) Which of the following is least likely to be important in holding the components of a biological membrane together?
Answer: It consists of a combination of a carbohydrate and a protein.
6) Things important in holding the components of a biological membrane together?
Answer: Polar interactions among the phospholipid head groups on the same surface of the membrane
7) Which of the following is least likely to be important in holding the components of a biological membrane together?
Answer: The membrane features covalent bonds between its phospholipid and protein elements. However, this interaction is not considered significant as covalent bonds between phospholipids and integral membrane proteins are uncommon.
8) Which of the following is a reasonable explanation for why unsaturated fatty acids help keep a membrane more fluid at lower temperatures?
Answer: Double bonds create bends in the fatty acid tails, hindering the close packing of neighboring lipids.
9) In what way do the membranes of a eukaryotic cell vary?
Answer: Specific proteins are exclusive to individual membranes.
10) In the reaction that builds a fat,________ groups react with ________ groups.
-phosphate; glycerol
-glucose; phosphate
-glycerol; water
-esters; phosphate
-esters; water
Answer: glycerol; water.
11) A function of cholesterol that does not harm health is its role —————-.
- “Functions as a vital part of the membranes in animal cells.”
- “Plays a role in the metabolism of calcium and phosphate.”
- “Every impact of cholesterol is detrimental to the body.”
- “Represents the most prevalent hormone in males associated with sexuality.”
- “Acts as the principal hormone associated with female sexuality.”
Anwer: Functions as a vital part of the membranes in animal cells.”
12) In the reaction that builds a fat,________ groups react with ________ groups.
-sulfhydryl; carboxyl
-hydroxyl; carboxyl
-hydroxyl; phosphate
-phosphate; amino
-carboxyl; amino
Answer: hydroxyl; carboxyl.
13) A food company hydrogenated a barrel of fat. The treatment
(a) reduced the fluidity of the fat.
(b) decreased the saturation of the fat.
(c) extended the length of the fat tails.
(d) increased the number of bends (kinks) in the fat tails.
(e) both (a) and (d).
Answer: (a) made the fat less fluid.
14) The most unsaturated fats have
the longest hydrocarbon chains.
the least number of double bonds.
the greatest number of double bonds.
the highest hydrogen-to-carbon ratio.
the shortest hydrocarbon chains.
Answer: the most double bonds.
15) What do DNA, proteins, and fats have in common
“They exist as polymer structures.”
“They possess polar characteristics.”
“They incorporate carbonyl groups in their structure.”
“They include nitrogen in their composition.”
“They feature phosphorus in their makeup.”
Answer: They incorporate carbonyl groups in their structure
16) Which of these is rich in unsaturated fats?
-butter
-beef fat
-olive oil
-lard
-a fat that is solid at room temperature
Answer: Olive Oil.
17) How do phospholipids interact with water molecules?
Answer: The polar heads engage with water, while the nonpolar tails do not.
18) Steroids are considered to be lipids because they ———–.
Answer: are NOT soluble in water.
19) What is the function of Structure E? (Cholesterol)?
Answer: Stabilizing the phospholipids.