Discuss the reasons why ART leads to more multiple and premature births than the general population
What will be an ideal response?
Each year, about 1.5% of babies born in the United States are conceived through IVF. In about 40% of all cases, three or more embryos are transferred, and about 20% of all pregnancies from IVF involve multiple births. These births generate health costs of $1 billion because twins and higher multiples are at a threefold higher risk of premature birth. About 42% of IVF births are premature, compared to about 13% of births in the general population. To avoid problems associated with multiple births, recent guidelines recommend that only one embryo should be transferred after IVF.
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Why do fungi produce fruiting bodies?
A. to enhance spore dispersal B. to provide food for animals C. to enhance photosynthesis D. to defend against predators E. to indicate territorial boundaries
All of the following are true statements about life zones EXCEPT:
a. Life zones are very broad geographical regions with similar physical characteristics. b. Terrestrial life zones are typically described by the dominant type of vegetation. c. Animals typically moved readily between different life zones in a geographical area. d. Each continent is made up of many different life zones
List the stages of mitosis and explain the key events during each of the stages.
What will be an ideal response?
Based on figure 16.14, which of the following is the most likely explanation for the observed pattern of MRSA strains?
a. The methicillin resistance mutation has evolved many times through processes like conjugation b. The methicillin resistance mutation arose once and was passed through processes like binary fission c. Methicillin resistance is a recessive mutation, and only appears when two carrier bacteria mate d. The distribution of methicillin resistance is random, and is not likely caused by a single mutation e. Toxic shock syndrome is caused by methicillin resistance