Answer:
The correct option is B.
Explanation:
Muscle tissues of the heart refers to a group of cells that are carrying out similar functions in the heart. There are three different types of muscles, these are skeletal, cardiac and smooth muscles. The cardiac muscles are found in the heart, they form the contractile wall of the heart. These muscle contract involuntarily ( that is, without any external stimulation) and they are single nucleus, striated and short.
Answer: where's the graph?
I think the correct answer from the choices listed above is option C. The lac operon is most active when glucose levels are low and lactose is present. A lac operon is an operon required for transport and metabolism of lactose. Hope this answers the question.