Codes on mRNAs for proteins are

Options

A. zig-zag
B. coplaner
C. colinear
D. none of these

Answer

To answer the question "Codes on mRNAs for proteins are," we need to analyze the options provided and understand the characteristics of mRNA and its relationship with proteins.

### Step-by-Step Solution:

1. **Understand the Nature of mRNA**:
- mRNA (messenger RNA) is a type of RNA that carries genetic information from DNA to the ribosome, where proteins are synthesized.

2. **Identify the Options**:
- The options given are:
- Zigzag
- Coplanar
- Collinear
- None of these

3. **Analyze Each Option**:
- **Zigzag**: This term suggests a non-linear arrangement. However, mRNA codes are not arranged in a zigzag pattern.
- **Coplanar**: This term refers to components that lie in the same plane. While mRNA can be visualized in a plane, this does not accurately describe the linear sequence of codons.
- **Collinear**: This term means that the sequence of nucleotides in mRNA corresponds directly to the sequence of amino acids in the protein. This is a key characteristic of mRNA; the arrangement is linear and directly correlates with the protein sequence.
- **None of these**: This option would imply that none of the previous options are correct, which is not the case here.

4. **Conclusion**:
- The correct answer is **Collinear**. The codes on mRNAs for proteins are collinear, meaning that the sequence of nucleotides in mRNA directly corresponds to the sequence of amino acids in the resulting protein.

### Final Answer:
The codes on mRNAs for proteins are **Collinear**.

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