A neutral atom has two, eight, eight electrons in its first, second, and third energy levels. This information ________.
A) does not tell us about the atomic number of the element
B) does not tell us about the chemical properties of the element
C) does not tell us about the atomic mass of the element
D) does not tell us about the size of the element
Ans: C) does not tell us about the atomic mass of the element
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How do scientists use a phylogenetic tree?
a. To name and group species to construct an internationally shared classification system b. To determine an organism’s taxonomic level c. To show evolutionary pathways and relationships between organisms d. To show the amount of time between evolutionary changes in related species
Which of the following is the most effective in
protecting against sexually transmitted diseases? a. condoms b. the Pill c. douching d. an IUD e. the rhythm method
ATP contains
a. alanine. b. arginine. c. ribose. d. tyrosine. e. glucose.
Choose the true statement about genome size and gene number in animals.
A. Genome size differences depend to a large extent on the amount of retrotransposon DNA present. B. The pufferfish has a larger genome than humans and more genes. C. There is a strong correlation between the number of genes and genome size. D. Much of the extra DNA in humans is in the form of exons.