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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?
We know that all radioactive isotopes decay over time as they emit particles and change into daughter isotopes. Briefly explain how radioactive decay and the concept of a half life enables scientists to estimate the ages of rocks.
List the tissues found in a segment of a three year old stem starting from the outside and moving to its center. Include both primary and secondary xylem/phloem, pith, cortex, vascular and cork cambiums, epidermis, periderm. Explain how "ray (pare..
From a a magazine or newspaper or internet ( HAS TO BE IN THE LAST 30 DAYS ) you must find an article about nail, hair or skin health. Make a summary of it in 300 words
q1. barbara mcclintock famous for discovering that genes might move within genomes had her meticulous work ignored for
Define the difference between these pairs of terms; gene and allele or homozygote and heterozygote
Red-green color blindness is a sex-linked trait. If a husband and wife (whose father was color blind) both have normal color vision, what proportion of their daughters would be expected to have red-green color blindness? Explain your answer.
What structures of the alveoli make them an ideal place for gas exchange?
Which of the following nuclear pre-mRNA nucleotide sequencespotentially contains an intron? After the intron has been spliced out, what will be the nucleotide sequence of mRNA molecule (without the intron)?
Describe principle behind various whole genome sequencing technologies. Describe application of one whole genome sequencing from literature for providing deeper insight into biological function.
how brain areas support cognitive function
A solution which is 3.19X10 to the -3 M in an acid (HA) and 6.78x10 to the -3 M in its conjugate base (A-) is found to have a pH of 8.65. What is the Ka of the acid?
Molecules of a liquid or a gas are constantly in motionbecause of the instrinsic kinetic energy in all atoms andmolecules. This is commonly called_____.
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