Humans with the condition of familial Down syndrome exhibit which type of chromosomal aberration?
A) chromosome 21 duplication
B) chromosome 21 inversion
C) chromosome 14/21 Robertsonian translocation
D) chromosome 21 deletion
E) trisomy of chromosome 21
C
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Phosphatases are enzymes that
A) add phosphate groups. B) are always inhibitory. C) do not alter target activity. D) remove phosphate groups. E) all of the above
List the most abundant ions in seawater, from most to least abundant
What will be an ideal response?
Refer to Figure 50-2. The function of the structure labeled 3 is:
a. to secrete an alkaline fluid that neutralizes the acids of the vagina. b. to produce a nutritive fluid for the sperm. c. to provide a place for maturation and storage of sperm. d. to secrete mucus that lubricates the penis. e. None of these.
Which of the following features enable organisms like planarian to respire and exchange nutrients?
A. a trilobed gastrovascular cavity B. coelomic fluid C. an open circulatory system D. closed circulatory system