1. Can any cellular process be governed by positive feedback? 2. If histidine is an inducer,...

1. Can any cellular process be governed by positive feedback?

2. If histidine is an inducer, do the enzymes who synthesize it induces participate in anabolism or catabolism? Can histidine be actually be an inducer of the his operon?

Expert Solution

1.

2.

The trp operon of E. coli codes for the enzymes that the bacterium needs to make the amino acid tryptophan. Like the lac operon, the trp operon is a negative control mechanism. The lac operon responds to an inducer that causes the repressor to dissociate from the operator, derepressing the operon. The trp operon responds to a repressor protein that binds to two molecules of tryptophan. When the tryptophan is plentiful, this repressor-tryptophan complex binds to the trp operator. This binding prevents the binding of RNA polymerase, so the operon is not transcribed (Fig. 3.20). On the other hand, when tryptophan levels are reduced, the repressor will not bind the operator, so the operon is transcribed. This is an example of a system that is repressible and under negative regulation.

gladiator answered 2 years ago

Question 1 Positive feedback differs from negative feedback because ________. positive feedback is generally beneficial while...

Question 1 Positive feedback differs from negative feedback because ________. positive feedback is generally beneficial while negative feedback is typically harmful positive feedback tends to enhance the triggering stimulus while negative feedback tends to return the body to a homeostatic balance or "ideal" level positive feedback is critical to health while negative feedback serves only to alert us to potential health threats positive feedback provides moment-to-moment wellbeing while negative feedback causes a cascade effect 2 points Question 2 A substance...

1). Explain why positive feedback is more likely than negative feedback to disturb homeostasis. 2). What...

1). Explain why positive feedback is more likely than negative feedback to disturb homeostasis. 2). What is the main chemical similarity between carbohydrates and lipids? What are the main differences between them? 3). Define hypotonic, isotonic, and hypertonic, and explain why these concepts are important in clinical medical practice. 4). Summarize the structural and functional differences between DNA and RNA.

Economics Question 1. a. Will positive network effects lead to positive or negative feedback effects, and...

Economics Question 1. a. Will positive network effects lead to positive or negative feedback effects, and given these feedback effects, will this lead to a larger or smaller size of the firm? b. The article “The Nature of the Firm” by Ronald Coase introduced the idea of transaction costs. Discuss how transaction costs also affect the size of the firm?

Topic 1: Feedback loops. Define & give real-life physiological examples of a negative and positive feedback...

Topic 1: Feedback loops. Define & give real-life physiological examples of a negative and positive feedback loop, in your answer include. Definitions for the negative and positive feedback loop Physiological examples of each A general description of the four major components of the feedback loop and what those components are in each of your examples A drawing of the feedback loop including where the negative and positive feedback occurs.

1. explain the connection between ocean acidification and climate change. 2. What positive or negative feedback...

1. explain the connection between ocean acidification and climate change. 2. What positive or negative feedback loops can be found within these systems?

1. What is Cellular Respiration? 2. What are the reactants of cellular respiration?

1. What is Cellular Respiration? 2. What are the reactants of cellular respiration? 3. What are the products of cellular respiration? 4. Define: a. Calorie b. Cellular respiration e. Aerobic d. Anaerobic e. Fermentation 5. Contrast aerobic and anaerobic respiration. 6. What are the three stages of cellular respiration? Where do they occur? 7. What is fermentation? 8. Compare and Contrast alcoholic fermentation and Lactic Acid Fermentation.

1. What are the two targets of positive feedback from the common pathway in blood clotting?...

1. What are the two targets of positive feedback from the common pathway in blood clotting? _____________ and the _______________ ____________________ . 2. Which connective tissue is about 50% water? ______________

Provide positive feedback: Powerful incentives can cause undesired behaviors. Suggest ways to solve this problem, using...

Provide positive feedback: Powerful incentives can cause undesired behaviors. Suggest ways to solve this problem, using something you know a great deal about – academic performance. With incentives come the challenges of ethical, moral, and legal behavior having a diminished impact on the choices one makes to achieve the incentive. This effect was shown with outstanding in the banking sector during the 2008 economic meltdown. The large incentives offered to the people working in the financial sector drove large groups...

Waste elimination and process improvement can be applied to virtually any process. Identify a process at...

Waste elimination and process improvement can be applied to virtually any process. Identify a process at work or school or home that you feel lends itself to waste elimination. You should first characterize the process, noting the value added and non-value added activities. Can the non-value added activities be eliminated? The value added activities should be examined and analyzed for potential improvements. Describe the system as it exists and as you think it should be. Describe how you went about...

Is there any monetary policy that can increase interest rate elasticity ( positive elasticity )?

Question