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Gametogenesis produces gametes containing only a single complement of genetic material. Fertilization restores the full diploid genetic complement. Human embryogenesis is that period of human development between fertilization/implantation and the fetal stage of growth which starts in the 9th week of gestation.
What are the processes and stages of human embryogenesis? How does a fetus develop from a one-cell fertilized egg? What factors in the immediate environment of the embryo are required to be present for normal embryo growth? What factors will disrupt this normal growth and cause problems?
How are carbohydrates important in RNA and DNA. What is their function in body organs and nerve cells? Do you know of any other functions?
In Staphylococcus epidermidis, bacillus subtilis and escherichia coli, which one has gram- positive, which one has gram-negative? Also, which organism is the biggest? Which one is the least.
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.
find out in which step each auxotroph has a mutaion. ("+" represents growth of the auxotroph on minimal meduim supplemented with the compund. ("-" represents no growth of the auxotroph on minimal meduim supplemented with the compound)
What are the underlying mechanisms that help assist a species to originate using sympatric speciation although they are not reproductively isolated like in allopatric speciation.Diversity within species that is using sympatric speciation.
The Neurospora cross was made between a strains that carried mating type A and mutant allele arg-1(arg) and another strain the carried mating-type a and the wild type arg-1 (+) gene. Four hundred linear octads were isolated and they fell into the 7 c..
The seeds of orchids are among the smallest known, with virtually no endosperm and with miniscule seed leaves. As a result, what must one expect to be true of such seeds.
Will victim die, or would the scientist have to go back to the laboratory to invent a more effective death-ray. The DNA is consequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s).
what happen if any did the UMP have on the activity. An investigation was set up to observe the effect of varying concentrations of the substrate galactose(S) on the rate of reaction of the kinase,v, with and without an added artificial nucleoside ..
Tina is consuming 12 mg of iron per day. Her RDA is 15 mg. She has no condition warranting a greater-than-normal need for iron. Which of the statements is true about her consumption of this nutrient.
The supernatant from normal cells corrects the defects in B and C, but not defect in A. Hurler's disease is as a result of the failure to make one particular lysosomal enzyme. The supernatant from A corrects the defect in Hurler's cells, but supernat..
In what ways are species more "fluid" than even 20th century biologists might have believed? To what extent was Darwin's explanation of species as "convenient constructions" accurate? Are species real.
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