The human brain consumes up to 20% of the energy used the entire human body which is any other single organ. the brain represents inly 2%of the body wheight yet it recieves 15% of the cardiac output and 20% of the total body oxygen consumption.
Answer:
Reverse transcriptase.
Explanation:
Reverse transcriptase may be defined as the enzyme used for the generation of the complementary DNA. Most viruses convert the RNA molecule into DNA in which RNA is present as genetic material.
The enzyme reverse transcriptase uses the RNA molecule as a template to produce the complementary DNA copy. This process is known as reverse transcription.
Thus, the correct answer is option (3).
Enzymes that are always present, regardless of the amount of substrate, are <u>constitutive enzymes.</u>
We can define enzymes as a biological catalysts that are almost always proteins. It accelerates a particular chemical reaction in the cell. Each enzyme molecule found in a cell is unique and tailored to a particular chemical reaction.
Constitutive enzymes are one of the enzymes that are always present in constant amounts regardless of the physiological demand or the substrate concentration. They are continually produced because they are essential for preserving cellular functions or structure. They are also known as "housekeeping enzymes" because they are constantly formed and vital for maintaining the cell's regular metabolic processes. Production of constitutive enzymes is always unaffected by an inducer's presence or absence.
Find more on enzymes at : brainly.com/question/1596855
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