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प्रश्न
Sketch and label ‘ultrastructure of mitochondrion’.
उत्तर
Ultrastructure OF MITOCHONDRIA
APPEARS IN
संबंधित प्रश्न
Give one significant contribution to the following scientists:
G. Gamow
Long Answer Question:
Describe the ‘Lac-operon’.
Explain the role of Lactose as an inducer in Lac-operon.
In which of the following conditions the lac operon in E. coli becomes "switched on"?
The wild type E. coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes takes place?
Which of the following cannot act as inducer?
In lac operon, lactose is the substrate for enzyme beta-galactocidase and its regulates ______.
Assertion (A): Regulation of lac operon by a repressor is referred to as negative regulation.
Reason (R): Lac operon is under the control of positive regulation as well.
Study the schematic representation of the genes involved in the lac operon given below and answer the questions that follow:
| p | i | p | o | z | y | a |
(a) The active site of enzyme permease present in the cell membrane of a bacterium has been blocked by an inhibitor, how will it affect the lac operon?
(b) The protein produced by the i gene has become abnormal due to unknown reasons. Explain its impact on lactose metabolism stating the reason.
(c) If the nutrient medium for the bacteria contains only galactose; will operon be expressed? Justify your answer.
Which molecule does act as inducer molecule in lac operon?
