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Two genome-wide association studies sought genes that contribute to intelligence. The first considered 1000 Mexican-American participants in the San Antonio Family Heart study, and found evidence pointing to genes on chromosomes 3,6 and 18. The second study looked at 1,094 children with attention deficit hyperctivity disorder and their siblings, and found gene candates for intelligence on chromosomes 7, 9 and 14. Suggest two possible reasons why the two studies had different results.
Cells can change the composistion of their membranes to adapt to different environmental situations. What component of the membrane coud be changed to help an organism tolerate cold?
Assume if there is no color change after the addition of the reagents noted in #4, zinc is added to the culture. What purpose does thezinc powder serve and What is the oxygen requirement of organisms that are able to reduce nitrates?
Distinguish between the terms configuration, margin, and elevation. Describe the best way to view each of these characterisitcs?
Discover the signs and symptoms associated with acute appendicitis. Why is this condition potentially dangerous to the patient. Occurs when the segment of chromosomes breaks off and becomes reattached to another chromosome.
He speculated that geologic columns would have the most height of 72,000 feet. Using his approach and numbers, compute the approximate age of the earth he came to.
Provide summary the structural organization of DNA. In your answer, be certain that you identify the chemical components of the molecule, and the arrangement of the molecule
The human appendix, a vestigial extension off the large intestine, is homologous to a structure called a caecum in other mammals.
A mammal uses only 1 to 2 percent of its energy in ventilation while a fish must spend about 15 percent of its energy to move water over its gills. Describe this huge difference in their efforts to collect oxygen.
Suppose that the length of ten base pairs of DNA found in one turn of the helix is 34 A, what is the average length of a human chromosome in centimeters?
Most physiological processes in the body can be regulated at three different levels autoregulation within the organ itself, nervous regulation, and hormonal regulation.
Suppose that you start with a lysogenic strain of E. coli. In this strain, a mutation arises that results in the intracellular repressor level becoming twice as high as it normally would be.
Smilin is a protein that causes people to be happy. It is inactive in many chronically unhappy people. The mRNA isolated from a number of different unhappy persons in the same family was found to lack an internal stretch.
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