Ultrasound and maternal serum marker tests are less informative than amniocentesis or
chorionic villus sampling (CVS) in diagnosing trisomy 21 because
A) ultrasound and maternal serum markers check chromosomes, and CVS and
amniocentesis do not.
B) ultrasound and CVS check chromosomes, and maternal serum markers and
amniocentesis do not.
C) ultrasound and maternal serum markers do not check chromosomes, and CVS and
amniocentesis do.
D) maternal serum markers and amniocentesis check chromosomes, and ultrasound and
CVS do not.
C
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The functional unit of the kidney is the
A) calyx. B) nephron. C) collecting duct. D) kidney lobe. E) renal sinus.
A major characteristic of fibrocartilage is its unique amount of flexibility and elasticity
Indicate whether the statement is true or false
________ are photoreceptors that convey our ability to see color
A) Rods B) Cones
Which of the following is involved in the coloring of the skin?
A) lamellated corpuscles B) Merkel cells C) Ruffini corpuscles D) tactile corpuscles E) melanocytes