How many years ago did the plants that formed fossil fuels actually live?
A) 300,000,000,000
B) 300,000,000
C) 300,000
D) 30,000
B
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A species of trilobite was found in the fossil record. At its first appearance, it is similar to an ancestor species but differs from the ancestor in several key characteristics. It seems to change little over several million years, then is extinct. This illustrates the concept of
A. punctuated equilibrium. B. gradualism. C. developmental evolution. D. anagenesis. E. evo-devo.
Two molecules with identical molecular formulas but different structures are called
A. polymers. B. isomers. C. isotopes. D. monomers. E. dimers.
Used to carry the genetic code
(A) Proteins (B) Carbohydrates (C) Nucleic acids (D) Lipids (E) Steroids
How is air contamination prevented when an inoculating loop is used to introduce or take a bacterial sample to/from an agar plate?
What will be an ideal response?