Leukocyte esterase, an enzyme found in an active urinary system infection, is produced by
a) T lymphocytes.
b) B lymphocytes.
c) neutrophils.
d) monocytes.
Ans: c) neutrophils.
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Protists are a diverse group of organisms. Which of the following is not characteristic of protists?
1.May be multicellular or unicellular. 2.May have DNA in a plasmid or in a nucleus. 3.May reproduce sexually or asexually. 4.May be autotrophs and/or heterotrophs.
The capacity to do work is
a. matter. b. energy. c. metabolism. d. aerobic respiration. e. life.
The allele frequency of allele b for the collection of fish in box 1 of the figure is
A. 25%.
B. 50%.
C. 75%.
D. 1:2:1.
The Abuja family had 10 children by 1950, but because of ill health, there is now only one surviving grandchild. The Bacchus family had three children in 1950 and now has six grandchildren. Which statement about these families is correct?
A) The Abuja family had more gene drift. B) The Abuja family had greater gene flow. C) The Bacchus family exhibits the bottleneck effect. D) The Bacchus family has greater fitness.