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Question: The drug methotrexate has been reported to cause fetal death and/or congenital anomalies, therefore, it is not recommended for women of childbearing potential unless there is clear medical evidence that the benefits can be expected to outweigh the considered risks. Why do you suspect that methotrexate is so dangerous to a growing fetus?
A lack of PRPP would prevent both the de novo and salvage pathways of purine biosynthesis.
Inactive RNA polymerase is incompatible with life.
Orotic aciduria in the mother is deadly to the fetus.
Rapidly dividing cells need a lot of dTMP.
Without base excision repair, even a growing fetus will age too rapidly
Describe how vestigial structures provide clues about a species' evolutionary past. Illustrate the argument with vestigial structures found in humans or other real species.
Discuss and define shock. Shock may occur by several pathways, but all types end up with the same basic problem - the cardiovascular system cannot supply enough O2 to cells.
For a given reaction, G = -4 kcal/mole and the energy of activation for the uncatalyzed reaction = 5 kcal/mole. You add an enzyme, after which the activation energy decreased to 3 kcal/mole.
How various of each possible phenotype. A locus in Australian Bearded Dragons is involved in the production of pigment. When heterozygous parents mate, 75% of the progeny are colored and the rest are albino.
The characteristic (trait) could be something like coloration pattern, length of the limbs, size of the teeth or beak, or any measurable trait that is inherited.
Twenty g soil sample was added to 80 ml of water to make the final volume of 100 ml (tube A). Then, ten ml of the ‘tube A' solution was taken and added to 90 ml of water.
As a pea plant grows, its root cells divide by mitosis. If the diploid chromosome number of the plant is fourteen, how various chromosomes will each newly formed root cell have.
What is the biochemical pathway that corresponds to duplicate dominant epistasis in genetics? There is a 15:1 ratio of phenotypes, there are two genes involved: A and B. but what is biochemical pathway that causes this ratio to form.
A Drosophila experiment analyzing linkage of X-linked genes studied a recessive eye mutation, a recessive wing-vein mutation, and a recessive bristle mutation
The matrix used in experiment has a fractionation range 20000 to 5x10^6 Daltons. Would you see this matrix purify a plasmid that had a molecular weight.
Explaining the cellular respiration and therocess of photosynthesis of plants.
Roges Staubauch has severe arthritis and has been taking prednisone for two months. He isn't feeling well, complains of repeated colds, and has become really puff in his appearance. What is the reason for this symptoms.
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