Which substance is NOT synthesized from cholesterol? A) Estradiol B) Thromboxane

Question

Which substance is NOT synthesized from cholesterol? A) Estradiol B) Thromboxane C) Bile salts D) Aldosterone E) Cortisol Which of the following amino acids belongs to basic R group type? Which of the following compounds is not an example of a steroid? A) Amylopectin B) Cortisol C) Bile salt D) Aldosterone E) Estradiol Which of the following lipids is a nonhydrolyzable lipid? A) Glycerophospholipid B) Sphingoglycolipid C) Prostaglandine D) Triolein E) Wax The defining feature (s) of fibrous proteins is (are): A) Water-insoluble B) Elongated shapes C) Aggregate tightly together into fibers or sheets D) Make up structural and contractile proteins. E) All of the above The molecule below is an example of _____

Explanation / Answer

Ans:

1. B

because Thromboxane is a member of the family of lipids and not a Steroid to which Cholesterol belongs.

2. A

All amino acids in proteins are S except Cystein (A) and a non chiral amino acid glyceine

3. A

Amylopectin is a water soluble polysaccharide and highly branched polymer of glucose found in plants. It is one of the two components of starch.

4. C

Lipids that contain a functional group ester are hydrolysable in water like neutral fats, waxes, phospholipids, and glycolipids. Nonhydrolyzable lipids lack such functional groups and include steroids and fat-soluble vitamins (e.g. A, D, E, and K)

Types of lipids:
Hydrolyzable: triacylglycerides, glycerophospholipids, sphingophospholipids, sphingoglycolipid.
Non hydrolyzable:
• Steroids: cholesterol, cortisol, estrogen, testosterone, progesterone, cholic acid (bile acid)
• Eicosanoids: Prostaglandins, Leukotrienes

5. E

6. Glycerophospholipids

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