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1. Since lactate is a "dead end" product of metabolism in the sense that its sole fate is to be converted into pyruvate, what is the purpose of its formation?
2. The molecule 2, 4 -dinitrophenol (DNP) is an uncoupler of oxidative phosphorylation. For a short period of time, it was prescribed clinically as a pill for weight reduction (against the advice of ssientists). Explain the basis for its ability to cause weight loss.
3. Consider the following reactions, which are two consecutive steps in the cyclic, multistep metabolic pathway referred to as the Kreb's cycle. The first reaction, which is not thermodynamically spontaneous, immediately precedes the second reaction, which occurs spontaneously. The two reactions are catalyzed by two independent enzymes.
L-malate + NAD plus<----> oxaloacetate + NADH + H plus +7(delta G knot --KJ/mol)Acetyl - CoA + oxaloacetate <----------> citrate +CoA -8( " " " " " )
How can the initial reaction occur in this pathway with such a high positive standard free energy?
After contact with a patient's spinal fluid, a lab technician developed fever, nausea, and purple lesions on her neck and extremities. A throat culture grew gram-negative diplococci. What is the genus of bacteria.
Recognizes true statements of cholesterol and its fluidity. Cholesterol increases membrane fluidity that otherwise contains mainly long chain saturated fatty acids.
The following Punnett square shows the inheritance of the sickle cell and SRY genes, with X representing the X chromosome with no SRY gene and Y representative the Y chromosome which does have an SRY gene. Complete the Punnett square.
Evaluate the sizes of the different digestive organs of the earthworm. Which organ is largest in the earthworm? How does its size make it well suited for its function.
While walking throughout a forest you notice that someone has carved his or her initials into the bark of a tree. The initials are exactly 1.5 meters from the ground. How far from grounds will the initials be next year and the year after that? Why? E..
When cloning a gene into an expression vector, people frequently use two different restriction enzymes so that passenger DNA can be inserted in the correct orientation with respect to promoter sequence present in the plasmid. But orientation is almos..
There they discover his mitochondria can use only fatty acids and amino acids for respiration, and his cells produce more lactate than normal. Of the following, which is the best description of his condition.
A porcupine eats 3,000 J of plant material. 1,600 J is indigestible and is eliminated as feces. 1,300 J are used in cellular respiration. What is the estimated production efficiency of this animal.
A farmer planted a field of BT 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 35 ears in 1/1000 of an acre. He determines that each ear has about 500 kernels on average. He also knows that a bushel contains about 97,..
What effect might this have on cell lineages during development. Describe the physical changes that would occur in SIM medium if you inoculated an organism that was negative for hydrogen sulfide but positive for indole production and motility.
The term "hominid" has traditionally been used to refer to species in the line the leads to modern humans after the divergence between that line and the line that leads to modern chimpanzees.
Nucleus, Mitochondria, How do receptors interact with hormones? How do the hormones interact with each Other? How do the secondary messengers work Again? Hormone binds to G protein what is the Hypothalamus.
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