An oxygen atom in water has two covalent bonds with hydrogen atoms and two unpaired electrons. How many hydrogen bonds can a water molecule form?
A. 4
B. 5
C. 1
D. 3
E. 2
Answer: A
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A zygote is formed ____
a. after a fertilized egg undergoes mitotic divisions to mature b. by the fusion of male and female somatic cells c. by the fusion of egg and sperm nuclei d. directly by meiosis in fungi e. by the mitotic divisions of spores in plants
Which benefit, derived from biodiversity, would be categorized as an ecosystem service?
a. the anticancer drug Taxol, derived from the yew tree b. plants and fruits that are edible by humans c. cotton and other useful plant-derived fibers d. decomposition of wastes e. wild organisms as a source of genes for genetic engineering
A test carried out under controlled conditions that may be manipulated by a researcher is a(n)
a. experiment. b. hypothesis. c. problem. d. procedure. e. variable.
Which of the following are prokaryotic organisms?
A. Animals B. Bacteria C. Fungi D. Plants