Question 1:

Starch is a polysaccharide, which is a type of carbohydrate made up of many glucose units linked together.

So the correct answer is:

C. Carbohydrate

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2:

Sugars (carbohydrates) are composed of carbon, hydrogen, and oxygen — typically with the general formula Cₙ(H₂O)ₙ.
Nitrogen is not a component of basic sugars, though it can be present in modified carbohydrates like amino sugars.

Therefore, the element not found in standard sugars is:

C. Nitrogen

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3:

The correct test for reducing sugars (such as glucose, fructose, maltose, and lactose) is Benedict’s solution.

• A. Iodine solution – Tests for starch (turns blue-black).

• B. Benedict’s solution – Turns from blue to green, yellow, orange, or red-brown when heated with a reducing sugar.

• C. Biuret A and B – Tests for protein (turns violet).

• D. Lime water – Tests for carbon dioxide (turns milky).

✅ Answer: B. Benedict’s solution

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 4:

The biuret test for protein turns purple in the presence of peptide bonds (protein). The color change is independent of heating for the biuret test – it occurs after adding biuret reagent at room temperature.

From the table:

• Solution A – Turns purple → indicates protein is present.

• Solutions B, C, D show other colors (blue, blue/black, yellow/orange), which are not positive results for protein in the biuret test.

✅ Answer: A

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 5:

Lipids (such as fats and oils) are composed mainly of fatty acids and glycerol — not sugars, amino acids, or nucleic acids.

✅ Answer: C. Fatty Acids and Glycerol

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 6:

Glycogen is a polysaccharide used for energy storage in animals and fungi. It is stored in the cytoplasm (specifically as granules in the cytosol) of cells, particularly in liver and muscle cells.

• A. Cell wall – Found in plants, bacteria, and fungi, but glycogen is not stored there.

• B. Cytoplasm – Correct; glycogen granules are suspended in the cytoplasm.

• C. Nucleus – Contains genetic material, not glycogen.

• D. Vacuole – Stores water, ions, and sometimes pigments or waste, not glycogen.

✅ Answer: B. Cytoplasm

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 7:

Amino acids contain an amino group (−NH2 −NH 2​ ) and a carboxyl group (−COOH −COOH), which means they always contain nitrogen in addition to carbon, hydrogen, and oxygen.

Fatty acids and glycerol are composed only of carbon, hydrogen, and oxygen — they do not contain nitrogen.

✅ Answer: A. Nitrogen

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 8:

Iodine solution turns blue-black in the presence of starch.

In the described banana cell, the oval structures (X) that turned black after adding iodine are most likely starch granules — because bananas contain starch, especially when unripe.

• A. Ink – Not naturally present in banana cells.

• B. Starch – ✅ Correct; iodine confirms its presence.

• C. Sugar – Does not react with iodine in this way.

• D. Glycogen – Animal/fungal storage polysaccharide; turns reddish-brown with iodine, not blue-black, and not typical in bananas.

✅ Answer: B. Starch

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

In plant cells, such as those from a banana, the cell wall (Y) is primarily composed of cellulose — a polysaccharide that provides structural support.

• A. Starch – Energy storage, not a structural cell wall component.

• B. Protein – Not the main structural material of plant cell walls.

• C. Lipids – Found in membranes, not the cell wall.

• D. Cellulose – ✅ Correct; main component of plant cell walls.

Answer: D. Cellulose

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

Let’s check each molecule and its listed role:

• A. Protein – Energy Storage – While proteins can be broken down for energy in extreme conditions, their primary roles are structural, enzymatic, transport, and signaling, not energy storage (that’s primarily starch/glycogen in organisms, and lipids in long-term storage). This is questionable as a main role.

• B. Sugar – Used in respiration – Correct, glucose is the main respiratory substrate.

• C. Lipid – Part of cell membrane – Correct, phospholipids form the bilayer.

• D. Starch – Energy storage – Correct in plants.

The incorrect role is A, because energy storage is not the primary role of proteins.

✅ Answer: A

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.