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Q1. Two intracellular molecules X and Y are both normally synthesized at a constant rate of 1000 molecules per second per cell. Molecules X is broken down slowly: each molecule of X survives on average for 100 seconds, Molecule Y is broken down 10 times faster, each molecule of Y services on average for 10 seconds.
Compute how many molecule of X and Y the cell contains at any time.
Q2. The breakdown of sucrose into the simple sugars fructose and glucose is an exergonic reaction. Sucrose is quite stable, and left on its own at room or even human body temperature, breakdown occurs very slowly. The enzyme sucrase catalyzes conversion of sucrose to glucose and fructose, increasing the reaction rate as a minimum one-million-fold. How does the net amount of energy released during the breakdown of sucrose compare between spontaneous reactions and catalyzed by sucrase?
A 19 year old woman presents with multiple deep scratches on her face that she sustaine while "playing with her cat". Which of the follwing protein familes mediates the transendothelial migration of leukocytes at the site of acute.
Describe the steps of the nitrogen cycle. How is nitrogen lost from ecosystems? How is it replaced? Why does it need to be "fixed?"
Among various factors that influence enzyme activity, phosphorylation is one of the most common mode of regulation.
Which minerals make up the majority of bone tissue, and what is their general structural purpose?
A wild cherry tree has 5 pairs of chromosomes in its nucleus found in a cell in the vascular cambium. What is the number of chromosomes and the number of linear DNA strands during the G2 stage cell cycle?
Which structure do antigen presenting cells utilize to directly help them present bacterial antigens?
What makes red light optimal for photosynthesis over blue light? What role do accessory pigments play in this?
All rod photoreceptors use glutamate as their neurotransmitter. All respond to light by decreasing the amount of neurotransmitter released. In some cases this causes hyperpolarization of bipolar cell membranes and in other cases it results in depo..
q1. a test tube contains starch pancreatic amylase and water. the buriet is negative. after 30 minutes benedicts test
A 2 kbp (1 kilo base pairs =1,000 bp) DNA fragment is to be amplified by PCR from the genome of nematode C.elegans, what fraction of the total DNA does the target sequence constitute
for what type od disease is the prevalence of the disease greater than the incidence?
Suppose that a duplex DNA molecule undergoes two double-stranded breaks that tightly flank the promoter of a gene and that the promoter region is inverted prior to enzymatic repair of the breaks.
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