Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements:
(1) In active transport, a substance crosses a cell membrane against a concentration gradient.
(2) Fatty acid melting point decreases with increasing degree of unsaturation.
(3) Complete hydrolysis of a TAG produces four product molecules, all of which must be different from each other.

Question

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: 
(1) In active transport, a substance crosses a cell membrane against a concentration gradient.
(2) Fatty acid melting point decreases with increasing degree of unsaturation.
(3) Complete hydrolysis of a TAG produces four product molecules, all of which must be different from each other.

Quizplus · Accepted Answer

Statement 1 is true because active transport involves moving substances across the cell membrane against their concentration gradient, often requiring energy in the form of ATP. Statement 2 is also true because unsaturated fatty acids, with their double bonds, have kinks that prevent tight packing, thus lowering their melting points compared to saturated fatty acids. Statement 3 is false because complete hydrolysis of a triacylglycerol (TAG) yields three fatty acid molecules and one glycerol molecule; the fatty acid molecules can be the same or different, but the total product count is four, not all distinct.

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