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Describe the lac operon, and it's transcriptional control when the concentration of glucose is low, and the concentration of lactose is high.

The lac operon is a section of DNA in E. Coli that consists of a promoter , operator and three genes encoding Beta-galactosidase , lactose permease and another gene. Beta galactosidase is an enzyme responsib...
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Answered by Albert T. • Biology tutor
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How does antibiotic resistance arise?

Bacteria replicate by binary fission, at a rate of up to one division every 20 minutes. This replication results in genetically identical daughter bacteria to the original, however with each round of genome ...
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Answered by Izzy T. • Biology tutor
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How is the blood sugar concentration maintained in the body?

The main organ controlling blood sugar levels is the pancreas. This is both an exocrine and endocrine gland. The endocrine part of the gland is what helps control blood glucose at a healthy level through the...
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Answered by Fatima R. • Biology tutor
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Cystic fibrosis is a genetic disorder caused by recessive alleles. Complete a Punnet square to show the inheritance of cystic fibrosis when both parents are carriers. State the probability of that a child born to these parents will have cystic fibrosis.

Punnet Square: to be shown on whiteboard. Percentage probability of inheritance: 25%
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Answered by Jake R. • Biology tutor
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Can you explain the limiting reagents of photosynthesis?

I have taught this content to my students in the past and I followed the plan detailed below:Definition of photosynthesis and limiting reagents: process by which plants create carbohydrates from raw material...
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Answered by Peace T. • Biology tutor
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