In negative control, Repressor molecule is expected to be bound to the operator is there is no transcription.
Repressor molecule is a small protein which binds with the operator gene and prevents it from starting the synthesis of proteins called operon. The repressor molecule controls the amount of enzyme synthesis by reducing its rate of formation. The lac repressor is a protein that represses (inhibits) transcription of the lac operon. In negative control, repressor molecule binds with the DNA molecule and blocks transcription process. A negative control is an experimental control that does not give a response to the test. The system of regulation in lactose and tryptophan operons outlined above is essentially a negative control.
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Answer:
Chloroplast
Explanation:
The organelle responsible for producing green pigment in a cell is the chloroplast.
- The chloroplasts are a type of plastids that produces chlorophyll in plants.
- Chlorophyll are very important in the light reaction process of photosynthesis.
- They are produced by the chloroplasts.
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Answer:
B lymphocytes produce antibodies - proteins (gamma globulins) that recognize foreign substances (antigen) and attach themselves to them. B lymphocytes (or B cells) are each programmed to make one specific antibody.