In a laboratory experiment, when an unknown compound was added to a test tube containing iodine, the color of the tube became intense blue. What could be the unknown compound?
Correct answer: D. Starch
- A. Cellulose
- B. Raffinose
- C. Ribose
- D. Starch
Explanation
The intense blue color formed when an unknown compound is added to iodine indicates the formation of a starch-iodine complex. Starch is known to give this characteristic blue color with iodine due to the formation of a helical inclusion complex.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Macromolecules
Proteins are classified by shape, composition and structure, from primary amino acid sequence to secondary, tertiary and quaternary organisation, and their biological roles are linked to this structure. Enzymes are examined as protein biocatalysts, including active sites, substrate specificity, activation energy, cofactors and factors affecting activity.
Practise Macromolecules
299 free Macromolecules MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Macromolecules questions
The percentage of cellulose in woody parts of trees is
Which one of the following nitrogen bases is not present in DNA?
Which one of the following is the exact composition of carbohydrates?
Ozone layer in upper atmosphere is being destroyed by:
Enzyme show optimum activity between 37°C and 50°C It, however loses activity permanently above
Enzyme is a natural substance that