The accumulation of free oxygen in Earth's atmosphere began with the origin of _____
A) life and respiratory metabolism
B) cyanobacteria using photosystem II
C) chloroplasts in photosynthetic eukaryotic algae
D) land plants
B
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Choose the observations supporting the hypothesis that the initiation of eye development in animals occurred only once.
_____ In some organisms, Pax6-related genes are associated with development of the forehead. _____ A large number of different organisms use Pax6-related genes in eye development. _____ The DNA sequence of Pax6-related genes in animals is uniformly similar. _____ The common ancestor of animals had a complex eye.
How many nucleotides are in a codon?
A. 1 B. 2 C. 3 D. 4 E. 5
The first life on Earth was probably most similar to modern-day
A. bacteria. B. protists. C. Archaeans. D. plants. E. fungi.
Bacteria divide through a process called binary fission
Indicate whether the statement is true or false