It has been known for some time that fetal cells can be found in a pregnant woman’s bloodstream, sometimes years
after a pregnancy. A new technique has been developed that allows scientists to isolate these fetal cells from a pregnant
woman’s blood. Why would this be a useful new tool for parents interested in genetic testing of their fetus?
What will be an ideal response?
ANSWER: Currently, chorionic villus sampling and amniocentesis are the methods of choice for
acquiring fetal cells for genetic testing. A blood sample from the mother would be a much
less invasive way to obtain fetal cells for testing.
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In general, sympatric speciation requires the action of _____ selection acting against hybrids
A. disruptive B. stabilizing C. directional D. artificial E. ecological
According to the fluid mosaic model of cell membranes, which of the following is true regarding
membrane phospholipids?
a. They are anchored in place by intermediate filaments. b. They can move laterally along the plane of the membrane. c. They have hydrophilic tails in the interior of the membrane. d. They occur in an uninterrupted bilayer, with membrane proteins bound only to the surface of the membrane. e. They are free to leave the membrane and dissolve in the interstitial fluid.
What do the peaks in the prey population graph signify?
a. At the top of the peak, the prey population is decreasing. b. At the top of the peak, the prey population is increasing. c. At the top of the peak, the prey population is neither increasing nor decreasing(dNprey/dt =0).
Thrombin acts on which protein?
a. fibrin b. plasmin c. fibrinogen d. plasminogen e. factor X