The question pertains to the relationship between kinases and cyclins in the regulation of the cell cycle. Specifically, it seems to focus on cyclin-dependent kinases (CDKs).

### Explanation

1. **Kinase Enzymes**: These are enzymes that add phosphate groups to other molecules (often proteins) in a process called phosphorylation, which can activate or deactivate the target molecule.

2. **Cyclins**: These are proteins that regulate the cell cycle by activating cyclin-dependent kinases (CDKs). Cyclins must bind to CDKs for them to be active.

3. **Cyclin-Dependent Kinases (CDKs)**: These kinases are only active when they are bound to a cyclin. This binding is crucial for the regulation of the cell cycle, ensuring that events such as DNA replication and cell division occur in a controlled manner.

### Final Answer
The correct option is **Cdk**, as kinases (specifically CDKs) are active only when they are attached to a specific cyclin.

Question

The question pertains to the relationship between kinases and cyclins in the regulation of the cell cycle. Specifically, it seems to focus on cyclin-dependent kinases (CDKs).

### Explanation

1. **Kinase Enzymes**: These are enzymes that add phosphate groups to other molecules (often proteins) in a process called phosphorylation, which can activate or deactivate the target molecule.

2. **Cyclins**: These are proteins that regulate the cell cycle by activating cyclin-dependent kinases (CDKs). Cyclins must bind to CDKs for them to be active.

3. **Cyclin-Dependent Kinases (CDKs)**: These kinases are only active when they are bound to a cyclin. This binding is crucial for the regulation of the cell cycle, ensuring that events such as DNA replication and cell division occur in a controlled manner.

### Final Answer
The correct option is **Cdk**, as kinases (specifically CDKs) are active only when they are attached to a specific cyclin.

Knowee AI · Accepted Answer

The question pertains to the relationship between kinases and cyclins in the regulation of the cell cycle. Specifically, it seems to focus on cyclin-dependent kinases (CDKs).

### Explanation

1. **Kinase Enzymes**: These are enzymes that add phosphate groups to other molecules (often proteins) in a process called phosphorylation, which can activate or deactivate the target molecule.

2. **Cyclins**: These are proteins that regulate the cell cycle by activating cyclin-dependent kinases (CDKs). Cyclins must bind to CDKs for them to be active.

3. **Cyclin-Dependent Kinases (CDKs)**: These kinases are only active when they are bound to a cyclin. This binding is crucial for the regulation of the cell cycle, ensuring that events such as DNA replication and cell division occur in a controlled manner.

### Final Answer
The correct option is **Cdk**, as kinases (specifically CDKs) are active only when they are attached to a specific cyclin.

An kinase enzyme that is active only when attached to a particular cyclin.Group of answer choicesMPFCdkcyclin

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