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A biosynthetic pathway proceeds from compound a to compound e in four steps and then branches.
one branch is a two-step pathway to g and the other is a three-step pathway to j. substrate a is a feed-forward activator of the enzyme and catalyses the synthesis of e. products g and j are feedback inhibitors of the initial enzyme in the common pathway, and they also inhibit the first enzyme after the branch point in their own pathways.
a. draw a diagram showing regulation of this metabolic pathway.
b. why is it advantageous for each of the two products to inhibit two enzymes in the pathway?
Explain the prevalence of the cervical cancer in 1999 and 2004? Specify how many women were at the risk of developing the cervical cancer before being screened in: 1999, and 2004.
q1. a technician in your lab has fractionated the parts of a cell and done chemical analyses of each fraction other
Examine of the bases of a sample of nucleic acid yielded these percentages: A= 20%, G= 30%, C= 20%, T= 30 percent. Explain why is the sample single stranded DNA.
Assume that decomposers were removed from the forest ecosystem; predict what would happen to the rate of nitrogen cycling. Explain the logic behind your prediction.
Wild tobacco plants with a single, dominant mutation are resistant to herbivory by hornworms (sphynx moth larvae). As a result, they grow larger and set many more seed. In areas where hornworms are present, what type of selection do they impose on..
Low-grade temperature, thrush in the oral cavity, fatigue, weakness, rash on trunk and legs - What tests would you recommend? Choose one of the tests and describe the causative agent of the potential diagnosis.
What chemicals do Nitrosococcus oceani and Nitrosopumilus maritimus consume from their ocean environment? How does the abundance of these chemicals influence their success and abundance? What is the relationship between nutrient availability and n..
Write an article on Overview of Thalassemia.
Mutations in the rII region of a bacteriophage T4 prevent its growth on E. coli strain K. You obtain numerous mutations in this region and want to determine how many genes are located there. You perform double infections of E. coli K with the diff..
Reduction often is referred to as the addition of hydrogens to a compound. It is more chemically correct to refer to reduction as the addition of electrons.
A two year old boy is treated for recurrent fractures of his long bones. Physical examination reveals blue sclera, loose joints, abnormal teeth, and poor hearing.
Briefly describe what is meant by "life", in the context of discussing what aspects of life currently seem to you most understandable in terms of atoms and molecules, what aspects seem least understandable, and why
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