_________ are granular structures first observed under electron microscope as dense particles by _______ (1955).

Options

A. Ribosomes, George Palade
B. Ribosomes, Perner
C. Lysosomes, de Duve
D. Peroxisomes, de Duve

Explanation

**Step-by-Step Solution:**

1. **Identify the Subject of the Question**: The question is asking about a specific type of granular structure that was first observed under an electron microscope.

2. **Recall the Key Term**: The term that fits the description of granular structures observed under an electron microscope is "ribosomes."

3. **Historical Context**: The question also requires identifying the scientist who made this observation in 1955.

4. **Identify the Scientist**: The scientist associated with the discovery of ribosomes in 1955 is George Palade.

5. **Formulate the Complete Answer**: Putting the information together, the complete answer to the question is: "Ribosomes are granular structures first observed under electron microscope as dense particles by George Palade (1955)."

**Final Answer**: Ribosomes are granular structures first observed under electron microscope as dense particles by George Palade (1955).

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