Which of the following can serve as an energy source and as structure support in plant cells?
A. proteins
B. carbohydrates
C. lipids
D. Nucleic acids
Answer: B. carbohydrates
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Humans differ from each other by 1 in 1000 to 1 in 5000 nucleotides, while chimpanzees differ from each other by 1 in 500 nucleotides. This suggests that _____
a. humans are a younger species b. humans are an older species c. humans descended directly from chimpanzees d. chimpanzees descended directly from humans e. chimpanzees and humans have identical proteomes
When producing a karyotype, the pairs of chromosomes ____
a. are arranged largest to smallest b. are arranged in alphabetical order c. are arranged with the X and Y first d. are aligned horizontally by their centromeres e. are arranged randomly
Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements. This led to the generalization now known as
A. valance electrons. B. the periodic table. C. the octet rule. D. an atomic model.
Which pair of species would be expected to have fewer genetic differences: orangutans and gorillas or gorillas and humans? Why? 
A. Gorillas and orangutans because their common ancestor (B) is more ancient than that of humans and gorillas (C). B. Gorillas and humans because their common ancestor (C) is more recent than that of orangutans and gorillas (B). C. Gorillas and orangutans because their common ancestor (C) is more ancient than that of humans and gorillas (D). D. Gorillas and humans because their common ancestor (D) is more recent than that of orangutans and gorillas (C).