To determine which of the options are organic bases, we first need to understand what constitutes an organic base in the context of biochemistry. Organic bases are typically substances that can accept protons (H⁺ ions) and often contain nitrogen atoms. In biological systems, they are significant because they can participate in hydrogen bonding and play crucial roles in the structure of nucleic acids.

Now, let's examine the options:

1. **Valine**: Valine is an amino acid and does not fit the criteria of an organic base as it primarily acts as a building block for proteins.

2. **Guanine**: Guanine is a nitrogenous base found in nucleotides; it is indeed an organic base found in DNA and RNA.

3. **Thymine**: Thymine is also a nitrogenous base present in DNA, classifying it as an organic base.

4. **Serine**: Similar to valine, serine is an amino acid and does not act as an organic base in the context of nucleic acids or proton acceptors.

Based on this analysis, the organic bases among the options are:

### Final Answer
**(b) Guanine** and **(c) Thymine** are organic bases.

Question

To determine which of the options are organic bases, we first need to understand what constitutes an organic base in the context of biochemistry. Organic bases are typically substances that can accept protons (H⁺ ions) and often contain nitrogen atoms. In biological systems, they are significant because they can participate in hydrogen bonding and play crucial roles in the structure of nucleic acids.

Now, let's examine the options:

1. **Valine**: Valine is an amino acid and does not fit the criteria of an organic base as it primarily acts as a building block for proteins.

2. **Guanine**: Guanine is a nitrogenous base found in nucleotides; it is indeed an organic base found in DNA and RNA.

3. **Thymine**: Thymine is also a nitrogenous base present in DNA, classifying it as an organic base.

4. **Serine**: Similar to valine, serine is an amino acid and does not act as an organic base in the context of nucleic acids or proton acceptors.

Based on this analysis, the organic bases among the options are:

### Final Answer
**(b) Guanine** and **(c) Thymine** are organic bases.

Knowee AI · Accepted Answer

To determine which of the options are organic bases, we first need to understand what constitutes an organic base in the context of biochemistry. Organic bases are typically substances that can accept protons (H⁺ ions) and often contain nitrogen atoms. In biological systems, they are significant because they can participate in hydrogen bonding and play crucial roles in the structure of nucleic acids.

Now, let's examine the options:

1. **Valine**: Valine is an amino acid and does not fit the criteria of an organic base as it primarily acts as a building block for proteins.

2. **Guanine**: Guanine is a nitrogenous base found in nucleotides; it is indeed an organic base found in DNA and RNA.

3. **Thymine**: Thymine is also a nitrogenous base present in DNA, classifying it as an organic base.

4. **Serine**: Similar to valine, serine is an amino acid and does not act as an organic base in the context of nucleic acids or proton acceptors.

Based on this analysis, the organic bases among the options are:

### Final Answer
**(b) Guanine** and **(c) Thymine** are organic bases.

Which of the following are organic bases?(a) Valine(b) Guanine(c) Thymine(d) Serine

Question

Which of the following are organic bases?

Solution

Final Answer

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