Which of the following is not correct concerning triglycerides (triacylglycerols

Question

Which of the following is not correct concerning triglycerides (triacylglycerols)? a. They serve a major function as metabolic energy storage molecules. b. They are amphipathic substances and are important membrane components. c. Triacylglycerols are transported from the liver in the blood to skeletal muscle and fat cells by Very Low Density Lipoprotein (VLDL). d. In animals, triglycerides are stored in the fat (adipose) tissue with very little water of hydration. e. The primary difference between liquid and solid triglycerides is that the liquids contain more unsaturation in the fatty acid residues. Which of the following is correct concerning Vitamin A? a. It is required for proper blood clotting. b. It is water soluble. c. It is added to milk products in order to decrease the incidence of the disease, Rickets. d. It is produced from an orange colored provitamin precursor commonly found in colored vegetables. e. It is a natural emulsifying agent in the digestive tract. Which of the following is correct concerning the Na^+ K^+-ATPase transport system? a. It is an example of passive transport. b. 3 Na^+ ions are transported out and 2 K^+ are transported into the cell for each ATP converted to ADP and Pi. c. The Na^+ ions are transported down a concentration gradient whereas the K ions are transported against a concentration gradient. d. The transporter consists of single protein which acts as a gated channel. e, 3 K+ ions are transported out and 2 Na^+ are transported into the cell for each ATP converted to ADP and Pi.

Explanation / Answer

6) Look at the statements which are true.

i) The body converts unused calories into triglycerides which are stored in fat cells. Hormones can decompose triglycerides to release energy in between meals. Hence point (a) is correct.

ii) Triglycerides and cholesterol are insoluble in blood. Lipoproteins are lipid carriers in blood which transport triglycerides to cells or tissues were triglycerides are broken down to release energy. Hence point (c) is correct.

iii) Specialized fat cells called adipocytes (actually adipose tissue) store triglycerides in human body; hence point (d) is true.

iv) Liquid triglycerides usually come from plants and solid triglycerides come from animals. Plant triglycerides contain more unsaturated fatty acid residues; thus point (e) is correct.

Therefore, the only point not true about triglycerides is (b).

7) Here we need to evaluate the only correct statement about Vitamin A.

i) Vitamin A is essential for proper vision and gene transcription; hence point (a) is false.

ii) Vitamin A is fat soluble; hence point (b) is false.

iii) Vegetables (mostly colored vegetables like carrots, squash, leafy vegetables), apricots are the biggest sources of Vitamin A. Hence point (c) is false.

iv) Point (d) is correct. Vitamin A is produced from an orange to red colored pigment called carotenoid.

v) Point (e) is false.

Hence the only correct statement is (d).

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