The earliest discovered fossils are of ________ dating back to ________ years ago
A) single-celled eukaryotes; 4.5 billion
B) prokaryotes; 3.5 billion
C) algae; 1 billion
D) fish; 600 million
Answer: B
You might also like to view...
Compare the molecular formula of a carbohydrate (CH2O)n with that of carbon dioxide (CO2). What does the presence of hydrogen atoms in carbohydrates indicate?
A) Carbohydrates are more reduced than carbon dioxide. B) Carbohydrates are more oxidized than carbon dioxide. C) Every carbon atom in a carbohydrate is bonded to four different atoms. D) Carbohydrates contain a carbonyl functional group.
The gametophyte is the dominant stage in the life cycle for which of the following plant groups?
a. club mosses b. whisk ferns c. liverworts d. horsetails e. ferns
Which human tissue cells can be over 1 metre in length?
a. adipocytes b. skeletal muscle cells c. neurons d. columnar epithelial cells
Place the following in the most likely order for biosynthesis of a
(1) phage lysozyme; (2) mRNA; (3) DNA; (4) viral proteins; (5) DNA polymerase. a. 5, 4, 3, 2, 1 b. 1, 2, 3, 4, 5 c. 5, 3, 4, 2, 1 d. 3, 5, 2, 4, 1 e. 2, 5, 3, 4, 1