A set of genes or cDNA is immobilized on a glass slide and used in transcription studies is called

Options

A. Proteome
B. Microarray
C. DNA chip
D. Genome

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a term that describes a set of genes or complementary DNA (cDNA) that is immobilized on a glass slide and used in transcription studies.

2. **Analyzing the Options**:
- **Option 1: Proteome**: This refers to the entire set of proteins expressed by a genome, cell, or tissue at a specific time. It does not relate to the immobilization of genes or cDNA on a slide, making it an incorrect choice.
- **Option 2: Microarray**: This is a laboratory tool used to detect thousands of genes simultaneously. It involves the immobilization of DNA sequences on a glass slide, making it a strong candidate for the correct answer.
- **Option 3: DNA Chips**: While similar to microarrays, DNA chips are often used interchangeably with microarrays. However, the term "microarray" is more commonly used in the context of transcription studies.
- **Option 4: Genome**: This term refers to the complete set of genetic material in an organism, including both coding and non-coding regions. It does not pertain to the immobilization of genes on a slide, so it is also incorrect.

3. **Identifying the Correct Answer**: Based on the analysis, the correct answer is **Microarray**. This term specifically refers to the technology that allows for the study of gene expression by immobilizing cDNA or genes on a glass slide.

4. **Final Answer**: A set of genes or complementary DNA is immobilized on a glass slide and used in transcription studies is called a **Microarray**.