At the milestone that defines telophase, the chromosomes
a. separate.
b. come together.
c. are at opposite poles.
d. line up.
e. cross over.
Ans: c. are at opposite poles.
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Cells with a short life span that circulate in blood and tissues and are usually the first cells on the scene of a bacterial invasion are called:
a. monocytes. b. polymorphonuclear neutrophils. c. lymphocytes. d. macrophages.
Compare a pseudocoelom to a coelom.
A. A coelom is completely enclosed by mesoderm whereas a pseudocoelom has an outer covering of mesoderm and an inner one of endoderm. B. A pseudocoelom is completely enclosed by mesoderm whereas a coelom has an outer covering of mesoderm and an inner one of endoderm. C. The coelom is enclosed by ectoderm and the pseudocoelom is enclosed by endoderm. D. The pseudocoelom is enclosed by ectoderm and the coelom is enclosed by endoderm. E. The coelom is enclosed by ectoderm and the pseudocoelom is enclosed by mesoderm.
Which of the following defines genetic diversity?
a. the variety of alleles in a species or ecosystem b. the number of living species currently identified c. the variety of metabolic compounds in an ecosystem d. the number of prokaryotic species in a genus
Which of the following wavelengths of light would you expect to be reflected or transmitted by chlorophyll a?
A) blue B) green C) yellow D) red