What are the advantages and disadvantages of chronic villus sampling (CVS) in comparison to amniocentesis? Why would one conduct CVS or amniocentesis following one of the non-invasive blood tests done on the mother?
What will be an ideal response?
The results of CVS can be made available within a few days, which might make it easier both legally and medically to have an abortion. Additionally, some birth defects may be prevented if they are caught early enough. However, with CVS there is a slightly greater chance of causing a miscarriage than is associated with amniocentesis. Due to the fact that the maternal blood testing has a high rate of false positives, if the blood test on the mother indicated a genetic abnormality, it would need to be confirmed by one of the other tests.
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Some species of Streptococcus, when grown on blood agar, produce a complete hemolysis with the formation of a clear zone around the colony; this is referred to as ________.
A. alpha-hemolysis B. gamma-hemolysis C. beta-hemolysis D. None of the choices are correct.
Due to reproductive isolation, a new species of weaver bird is evolving. Is it likely to use a social or solitary nesting strategy?
A. It depends on whether it lives in the forest or the open savanna. B. It depends on whether it lives in near water or near the desert. C. It depends on how many similar species it is competing with. D. It depends on how many eggs it lays.
The first cells were
a. autotrophic. b. parasitic. c. anaerobic. d. aerobic. e. all of these.
Which parts belong to the central nervous system?
A) sensory neurons B) interneurons C) motor neurons D) effectors