Four of the five structures listed below are common
in mollusks. Select the exception.
a. gills
b. head and foot
c. mantle
d. carapace
e. radula
Answer: d
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Which statement is true about the structure of DNA?
A) It is a polymer made up of a string of amino acids. B) Each different sequence folds into a different three-dimensional shape. C) The two strands of a DNA molecule are held together by base pairing. D) It contains nitrogenous bases known as A, C, G, and U.
The element in the body with the greatest number of atoms is
a. phosphorus. b. oxygen. c. hydrogen. d. calcium. e. carbon.
Which of the following is a nematode worm that has been used as a model organism in genetics?
A) Drosophila melanogaster B) Mus musculus C) Arabidopsis thaliana D) Caenorhabditis elegans E) Homo sapiens
Suppose a population splits into two descendant populations prior to any evolution of dark coloration, then splits again after the evolution of dark coloration. Which of the following is true?
a. Changes in coat color tell us something about evolutionary history. b. Using these analogous traits in building an evolutionary tree might cause us to incorrectly infer a closer phylogenetic relationship between these species than actually exists. c. In this case, dark coloration is not only a derived trait but it is also shared by two populations because it is a homologous trait. d. All but B are true.