Answer:
Negative inducible.
Explanation:
Operon may be defined as the cluster pf genes that are expressed by the single RNA polymerase. The operon includes in the example of the the polycistronic genes.
Negative inducible operon includes the binding of regulatory protein with the DNA and inhibits transcription. The regulatory protein binds with the operator that prevents RNA polymerase transcription. The mutation in the negative inducible operon prevents the binding of repressor to the small molecule.
Thus, the correct answer is option (a).
B. Antibiotics attack only bacteria.
Digestion begins in the mouth. Saliva contains enzymes which begin to break down food. The mouth also uses the teeth and jaw to mechanically break down food.
First, deoxygenated blood flows into the right atrium of the heart from the inferior and superior vena cava.
Blood then flows through the bicuspid valve and into the right ventricle.
The blood then flows through the pulmonary valve and into the pulmonary artery. Arteries carry blood away from the heart while veins return blood to the heart. The pulmonary artery is on of the only arteries that carries deoxygenated blood.
Blood will then pass through the lungs and will be oxygenated.
After being oxygenated, the blood enters the pulmonary veins. The pulmonary veins are some of the only veins that carry oxygenated blood.
Blood enters back into the heart through the left atrium.
Then, blood flows into the left ventricle through the mitral valve.
Finally, blood is pumped through the aortic valve, into the aorta, and is distributed throughout the body.
