Test: Biological Molecules - Year 11 MCQ

A triglyceride consists of one glycerol molecule bonded to three fatty acid chains. Therefore, the basic unit of a triglyceride is glycerol.

The iodine test is used to detect starch. A positive result shows a color change from orange-brown to blue-black.

In DNA structure, Adenine pairs with Thymine (A-T), and Cytosine pairs with Guanine (C-G). The phosphate and sugar form the backbone, not the rungs, and DNA has a double helix structure.

The presence of glucose is tested using Benedict's solution, which requires heating. A positive result changes the color from blue to orange or brick red.

A positive test for proteins with Biuret solution is indicated by a color change from blue to violet or purple.

Nucleotides are the building blocks of DNA, each consisting of a sugar, phosphate group, and a nitrogenous base.

The ethanol test for lipids will show a cloudy emulsion if lipids are present, indicating a positive result.

In DNA, Adenine always pairs with Thymine (A-T).

In the DCPIP test, a positive result is shown by the disappearance of the blue color, indicating the presence of vitamin C.

Carbohydrates are classified based on their structure as simple sugars (monosaccharides) and complex carbohydrates (polysaccharides), depending on the number of glucose units and their arrangement.