QCM : Fundamentals of Biological Testing and Cell Structure — 10 questions

Question 1

1. What does the iodine test with iodine solution primarily detect in a biological sample?

Presence of starch in the sample

Presence of fats in the sample

Presence of proteins in the sample

Presence of sugars in the sample

Explication

The iodine test is specifically used to detect the presence of starch in a sample. When iodine solution is applied to a sample containing starch, it turns black or blue-black, indicating a positive result. The other options refer to fats, proteins, and sugars, which are not detected by this test.

Answer

Presence of starch in the sample

Question 2

2. What color change indicates a positive iodine test for starch?

Yellow or brown

Black or blue-black

Red or pink

Green or yellow-green

Explication

A positive iodine test for starch results in a color change to black or blue-black, which indicates the presence of starch. Other colors like yellow or red are not associated with starch detection.

Answer

Black or blue-black

Question 3

3. What indicates a positive result in the Fat Test with Ethanol?

The solution turns clear and colorless

No change occurs in the solution

The solution turns bright yellow

The mixture becomes cloudy or milky

Explication

A positive result in the Fat Test with Ethanol is indicated by the mixture turning cloudy or milky, which shows that fats are present and have formed an emulsion.

Answer

The mixture becomes cloudy or milky

Question 4

4. Which reagent is used in the starch test?

Biuret solution

Ethanol

Iodine solution

Benedict’s solution

Explication

Iodine solution is used in the starch test, where it reacts with starch to produce a color change to black or blue-black. Biuret tests for proteins, ethanol for fats, and Benedict’s for sugars.

Answer

Iodine solution

Question 5

5. What is the primary function of the Biuret test in biological samples?

To measure the amount of fats

To identify the presence of starch

To detect the presence of proteins

To determine the sugar content

Explication

The Biuret test is specifically used to detect the presence of proteins in a sample, indicated by a purple color change. It does not test for starch, fats, or sugars, which are identified by other specific tests.

Answer

To detect the presence of proteins

Question 6

6. What does a cloudy or milky appearance in the ethanol test suggest?

Presence of protein

Presence of sugar

Presence of fats (lipids)

Absence of nutrients

Explication

A cloudy or milky appearance in the ethanol test indicates emulsion formation, which suggests fats or lipids are present in the sample. The test is not related to proteins or sugars.

Answer

Presence of fats (lipids)

Question 7

7. Which type of biological molecule is specifically detected using the Benedict’s test?

Proteins

Sugars (reducing sugars)

Starch

Lipids

Explication

Benedict’s test is used to detect reducing sugars, such as glucose. A positive result shows a color change from blue to green, yellow, or brick-red, depending on the sugar concentration.

Answer

Sugars (reducing sugars)

Question 8

8. What is a key feature of starch as stored in plants?

A monosaccharide that is a quick energy source

A polysaccharide composed of glucose units

A lipid used for long-term energy storage

An amino acid stored in plant tissues

Explication

Starch is a polysaccharide made up of glucose units and serves as an energy reserve in plants. It is not a monosaccharide, lipid, or amino acid.

Answer

A polysaccharide composed of glucose units

Question 9

9. Which cell components are primarily involved in cell structure and function?

Nucleus and mitochondria

Cell wall, membrane, cytoplasm, and organelles

Ribosomes and enzymes only

DNA and RNA only

Explication

Cell structure and function are mainly determined by components like the cell wall, membrane, cytoplasm, and organelles, which carry out various essential roles within the cell.

Answer

Cell wall, membrane, cytoplasm, and organelles

Question 10

10. Who is credited with the development of the modern cell theory in 1838 and 1839?

Robert Hooke

Matthias Schleiden and Theodor Schwann

Louis Pasteur

Anton van Leeuwenhoek

Explication

Matthias Schleiden and Theodor Schwann developed the modern cell theory in 1838-1839, stating that all living organisms are composed of cells. Hooke described cells earlier, but the theory was formalized by Schleiden and Schwann.

Answer

Matthias Schleiden and Theodor Schwann

QCM : Fundamentals of Biological Testing and Cell Structure — 10 questions

Questions et réponses du QCM

1. What does the iodine test with iodine solution primarily detect in a biological sample?

2. What color change indicates a positive iodine test for starch?

3. What indicates a positive result in the Fat Test with Ethanol?

4. Which reagent is used in the starch test?

5. What is the primary function of the Biuret test in biological samples?

6. What does a cloudy or milky appearance in the ethanol test suggest?

7. Which type of biological molecule is specifically detected using the Benedict’s test?

8. What is a key feature of starch as stored in plants?

9. Which cell components are primarily involved in cell structure and function?

10. Who is credited with the development of the modern cell theory in 1838 and 1839?

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