All of the following are signs of infectious diseases, except
A. fever.
B. antibodies in serum.
C. swollen lymph nodes.
D. leucopenia.
E. nausea.
Answer: E
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The human body contains approximately 200 major cell types. They look and function differently from one another because:
A. each has a slightly different genome. B. each expresses a different set of genes. C. each expresses the same set of genes, but in different orders at different times. D. each has a slightly different genome and each expresses a different set of genes.
A friend tells you a story about his grandmother, who moved to your city from her home across the ocean when she was very young, bringing with her a pair of mice that were commonly kept as pets where she was born. Shortly after arriving, however, the mice escaped. After listening to this story, you do some research and discover that the wild mice that live in your city have only been documented within the past half century and, although they share distinctive traits with domesticated mice that only exist near your friend’s grandmother’s birthplace, they are unable to interbreed. Which statement could be true?
a. The mice in your city have acquired a mutation that renders them incapable of reproduction. b. The two populations of mice are unable to reproduce due to reinforcement. c. Your friend’s grandmother inadvertently caused allopatric speciation via dispersal. d. The similarity between these two species of mice can be explained by vicariance.
TRAIT SPECIESABCDE111011211010311100410000511100611011The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, while "1" indicates the derived condition. Which trait is least informative of phylogenetic relationships within the group?
A. A B. B C. C D. D E. E
Early seed plants were pollinated by ________, as are present-day conifers.
A. bees B. beetles C. water D. trilobites E. wind