Biomolecules and their Basic Units
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Questions and Answers

What is the basic unit of carbohydrates?

  • Amino acids
  • Monosaccharides (correct)
  • Fatty acids
  • Acyl glycerols

Which biomolecule is built from amino acids?

  • Carbohydrates
  • Nucleotides
  • Proteins (correct)
  • Fats/Lipids

What combination makes up the basic unit of fats/lipids?

  • Glycerol and amino acids
  • Fatty acids and nucleotides
  • Monosaccharides and acyl glycerols
  • Glycerol and fatty acids (correct)

In the context of biomolecules, which of the following is NOT a basic unit?

<p>Nucleic acids (A)</p> Signup and view all the answers

What type of biomolecule do glycerol and fatty acids contribute to?

<p>Fats/Lipids (C)</p> Signup and view all the answers

What is the expected observation in the Test for Thiocyanates when a positive result occurs?

<p>Pale yellow with red precipitate (D)</p> Signup and view all the answers

Which test would indicate the presence of protein in saliva?

<p>Biuret Test (C)</p> Signup and view all the answers

What color change would be observed in Fehling's Test indicating a positive result?

<p>From blue to brick red precipitate (D)</p> Signup and view all the answers

In the context of saliva, what is the pH range considered to be normal?

<p>6.5 - 7.5 (C)</p> Signup and view all the answers

What result indicates complete digestion during the Starch Digestion Test?

<p>No color change (A)</p> Signup and view all the answers

What color indicates the presence of starch before enzymatic activity in the Iodine Test?

<p>Violet (C)</p> Signup and view all the answers

Which product is formed during the breakdown of starch by amylase and appears purple?

<p>Amylodextrin (C)</p> Signup and view all the answers

What does the Fehling's Test indicate when a brick red precipitate is formed?

<p>Presence of reducing sugars (D)</p> Signup and view all the answers

What is the significance of colorlessness in the Achrodextrin test?

<p>Indicates advanced digestion of starch (D)</p> Signup and view all the answers

Which test result indicates the presence of reducing sugars after digestion but does not specify concentration?

<p>Fehling's Test - Blue solution → Brick red precipitate (D)</p> Signup and view all the answers

What color indicates a positive result in the Biuret Test?

<p>Violet (D)</p> Signup and view all the answers

Which test specifically aims to detect pentose sugars?

<p>Orcinol Test (B)</p> Signup and view all the answers

What does a green to blue color change in the Orcinol Test signify?

<p>Presence of pentose sugars (A)</p> Signup and view all the answers

Which of the following tests can detect both proteins and glycoproteins?

<p>Biuret Test (B), Phosphotungstic Acid Test (D)</p> Signup and view all the answers

In which test would you expect to see a green, yellow, or red precipitate?

<p>Benedict's Test (A)</p> Signup and view all the answers

Flashcards

Protein basic unit

Amino acids are the building blocks of proteins.

Carbohydrate basic unit

Monosaccharides, like glucose, are the basic units of carbohydrates.

Fat basic unit

Acyl glycerols, a combination of glycerol and fatty acids, compose fats.

Amino acid

A molecule containing an amino group and a carboxyl group.

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Monosaccharide example

Glucose is a common monosaccharide.

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Biuret Test detects

Proteins containing peptide bonds, like mucin.

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Benedict's Test identifies

Reducing sugars in a sample, possibly in glycoproteins.

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Orcinol Test targets

Pentose sugars, a type of sugar.

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Phosphotungstic Acid Test finds

Protein components, including mucin.

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Mucin contains

Proteins and sugars, detected by multiple biochemical tests.

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Saliva Mucin Test

A chemical test using Biuret reagent to detect the presence of mucin in saliva.

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Saliva Calcium Test

A chemical test using Mugnwala's reagent to detect calcium in saliva.

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Saliva Thiocyanate Test

A chemical test using ferric chloride to detect thiocyanates in saliva.

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Starch Digestion Test in Saliva

A test to determine if saliva has broken down starch using the iodine test.

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Saliva pH

The acidity/alkalinity of saliva measured using pH paper.

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Iodine Test

Used to identify the presence of starch by turning a violet color in the presence of starch.

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Amylodextrin

A partial digestion product of starch, resulting in a purple color when tested with iodine.

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Erythrodextrin

A further breakdown product of starch, resulting in a red color when tested with iodine.

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Achrodextrin

An advanced digestion product of starch, appearing colorless when tested with iodine.

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Fehling's Test

Tests for the presence of reducing sugars, producing a brick red precipitate from a blue solution in the presence of reducing sugars.

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Study Notes

Biomolecules and their Basic Units

  • Proteins are composed of amino acids.
  • Carbohydrates are made up of monosaccharides, such as glucose.
  • Fats/Lipids are formed from acyl glycerols (glycerol + fatty acids).

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Description

This quiz explores the fundamental building blocks of biomolecules including proteins, carbohydrates, and fats. Understand the composition and structure of these essential biological molecules, and test your knowledge on their basic units. Perfect for students diving into molecular biology.

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