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Which of the foll. is true about biogeochemical cycles? a. phosphorus cycle involves recycling of atmospheric phosphorus b. phosphorus cycle is a cycle that involves weathering of rocks c. carbon cycle is a localized cycle that primarily involves burning of fossil fuels d. carbon cycle has maintained a constant atmospheric concentration of CO2 for the past several million years. e. nitrogen cycle involves movement of diatomic N between the different abiotic components of the ecosystem.
Which of the following is not true about introns?
Two true breeding plants are crossed; one is true breeding for purple kernels and dwarf stems, and the other is true breeding for white kernels and tall stems. The F1 offspring all have purple kernels and tall stems. Two of these F1 plants are the..
Barbiturates cause hypoventilation that is the slower-thannormal rate of breathing, since they suppress the respiratory centers in the brain. What happens to the red blood count of a habitual user of barbiturates? Explain in details.
In what two different ways do bacteria "sense" the amount of trp in the environment? Describe both mechanisms in detail. What are two hypotheses for the role of RNA silencing.
In surgery, a surgeon pulls a loop of bowel through a 4.2 inch incision in linea alba and inspected the surface. There were smally fatty appendages hanging around length of piece of bowel.
Think about a cross between a male who has vitamin D resistant rickets and a female who has fully functional PHEX protein and does not express vitamin D resistant rickets.
An inversion heterozygote possesses a normal chromosome and one with an inversion. The gene orders in these 2 chromosomes are shown below- Normal 1 2 3 4 5 6 7 8 9 10 o.
Explain why would temperature affect respiration rates and what is going on at the cellular level that could be impacted by either an increase or a decrease in the temperature in which an organism is found?
List two possible mutations that might cause this phenotype. Be as specific as possible about the location of mutation. What led physician to make this diagnosis, and what might have caused the sudden attack.
A series of enzymes catalyze the reaction X Y Z A. Product A binds to the enzyme that converts X to Y at the position remote from its active site. This binding decreases the activity of the enzyme.
Bacteriophage M13 infects E. coli differently from the way bacteriophage T2 does. The M13 coat is removed in the inner membrane of the bacterial cell, where it is sequestered during phage replication.
DNA sequences are used quite often to evolutionary relationships between species. Explain why is the DNA sequence of one gene a less accurate indicator of the evolutionary.
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