Explain how the number of valence electrons is related to the chemical properties of an atom. Use two specific
examples in your explanation. What will be an ideal response?
Atoms having filled valence shells (e.g., helium and neon) are stable and unreactive; atoms
having unfilled valence shells (e.g., chlorine and sodium) are unstable and reactive.
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Gibbons and orangutans are from Asia. Gorillas and chimpanzees are from Africa. How was Charles Darwin able to predict that humans evolved in Africa?
A. He understood that humans and Great Apes were closely related. B. He understood that humans and gorillas are more closely related than humans and orangutans based on anatomical criteria. C. He understood that humans and orangutans are more closely related than humans and gorillas based on anatomical criteria.
Hybridization methods are based on:
a. the ability of two nucleic acid strands that have complementary base sequences to bond specifically with each other and form a double-stranded molecule. b. detecting phenotypic traits not detectable by conventional strategies. c. the principles of complementary nucleic acid hybridization with those of nucleic acid replication that are repeatedly applied through numerous cycles. d. determining the exact nucleotide sequence of a gene or gene fragment obtained from an organism.
Down syndrome is associated with
a. mental retardation. b. abnormal skeletal development. c. weak muscle reflexes. d. slowly developing motor functions. e. all of these.
Which of the following is true of nitrogen?
A. N2 is scarce in the atmosphere, therefore, plants must obtain other sources of nitrogen. B. Animals require nitrogen from the food they eat for the synthesis of carbohydrates and lipids. C. Nitrogen-fixing bacteria convert N2 into compounds plants can utilize. D. Nitrogen is plant food and, therefore, provides plants with energy.