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?
Currently, CVS and amniocentesis are the methods of choice for acquiring fetal cells for genetic
testing. A blood sample from mom would be a much less invasive way to get fetal cells for testing.
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Testosterone is an example of a chemical signal that affects the very cells that synthesize it, the neighboring cells in the testis, along with distant cells outside the gonads. Thus, testosterone is an example of _____
I) an autocrine signal II) a paracrine signal III) an endocrine signal A) only I and II B) only II and III C) only I and III D) I, II, and III
Which of the following nitrogenous bases is usually found in RNA but not in DNA?
A. Adenine B. Uracil C. Thymine D. Guanine
An opening in leaves that functions in the exchange
of gases is called a a. cuticle. b. stoma. c. guard cell. d. pit. e. pore.
Which of the following is true?
A. All the cells of an individual have the same genetic sequence despite having different shapes and functions. B. All the cells of an individual have the same genetic sequence and present the same shapes and functions. C. All the cells of an individual have different gene sequences and present the same shapes and functions. D. All the cells of an individual have different genetic sequence and so present the same shapes and functions.