You are a climate scientist who wants to investigate climate change. Which measurement would be the least useful?
A) rainfall in the southeastern United States from 20 years ago to the present day
B) a long-term (30-year) study of coral biodiversity in the Australian reef ecosystem
C) changes in carbon dioxide (CO2 ) emission levels in China from 25 years ago to the present day
D) methane (CH4 ) levels from dairy farms in Iowa during the years 2011 and 2012
Answer: D
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Which of the following is not a constituent of the nucleus?
A. pores B. envelope or membrane C. chromosomes D. chromatin E. protein modifying enzymes
Which of the following is a unique feature of viruses that separates them from bacteria?
A. They are generally smaller. B. They are often highly toxic. C. They lack proteins. D. They have different nucleotides in their hereditary material. E. They cannot exist outside of a host cell.
In humans during meiosis, a diploid germ cell reduces its chromosome number by half to generate haploid cells.
A. 46 B. 4 C. 2 D. 3 E. 23
Birds use specific songs, coloring, and mating dances to attract mates of their species. This is an example of _____ reproductive isolation.
A. postzygotic B. allopatric C. prezygotic D. sympatric E. outgroup