Because oxygen is more electronegative than hydrogen, the water molecule is
A. ionic.
B. nonpolar.
C. hydrophilic.
D. hydrophobic.
E. polar.
Answer: E
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Which of the following organisms causes plague?
A. Helicobacter pylori B. Bordetella pertussis C. Campylobacter jejuni D. Yersinia pestis
Which of the following statements best compares a pseudocoelom and 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.
Because a direct count of all individuals within a population is often impossible, population density is usually estimated by one or more methods of ________
Fill in the blank(s) with correct word
What can be said about animal and vegetal poles?
A. Isolated vegetal cells develop as ectoderm. B. When animal pole cells are cultured with vegetal pole cells, some of the animal pole cells become mesoderm. C. Isolated animal cells develop as endoderm. D. When animal pole cells are cultured with vegetal pole cells, some of the vegetal pole cells become mesoderm.