Nitrogen-fixing bacteria, such as cyanobacteria, can use atmospheric nitrogen (N2 ) for their nitrogen source
Indicate whether the statement is true or false
TRUE
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The first vertebrates are seen in the fossil record of the:
A. Ediacaran. B. Cambrian. C. Ordovician. D. Devonian. E. Jurrasic.
Seed plants are _____
a. flowering plants d. spermatophytes b. conifers e. tracheophytes c. gymnosperms
Which of the following conclusions can be made if two identical insertion sequences are identified in separate locations on a chromosome?
A. The insertion sequence was a "cut-and-paste" transposon. B. The insertion sequence was transferred via replicative transposition. C. The insertion sequence was transferred via simple transposition. D. A mutation occurred during transposition of the insertion sequence.
The smallest units that still remain the characteristics of an element are called
A) atoms B) molecules C) tissues D) organic molecules E) cells