Down syndrome (trisomy-21) results from ________.
A. a teratogen
B. an autosomal recessive allele
C. nondisjunction
D. a sex-linked mutation
E. a mutagen
Answer: C
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Fill in the blank(s) with correct word
The barrier between the plasma and interstitial fluid
a. is the blood vessel walls b. is the plasma membrane c. transports materials between these two fluid compartments by both passive and active means d. is both a and b e. is all of the above
Human chorionic gonadotropin (HCG)
A. is used to detect pregnancy. B. maintains the corpus luteum until the placenta is secreting hormones. C. keeps a new follicle from developing. D. All apply.
In a normal ECG, the deflection that is generated by ventricular repolarization is called the ________
A) QRS wave B) P wave C) T wave D) R wave E) S wave