The existence of a separate set of enzymes and DNA molecules in mitochondria and chloroplasts
provide support for serial endosymbiosis.
__________________Indicate whether the statement is true or false.
F, ribosomes
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The minimum age of the LUCA (last unique common ancestor) is the age of the oldest fossils that can be identified with certainty as close relatives of present-day prokaryotes and eukaryotes. Such fossils are about ________
A) 3.8 billion years old B) 2 billion years old C) 542 million years old D) 3.28 billion years old E) 65 million years old
A __________ is the physical expression of the genes present, and can change depending upon what genes are turned "on".
A) plasmid B) chromosome C) phenotype D) genotype
Earth is tilted about how many degrees on its axis?
A. 8 B. 15 C. 23 D. 30 E. 38
Which of the following characteristics do all viruses have in common?
A. They all have a broad host range. B. They all infect eukaryotes. C. They all have DNA genomes. D. They all contain a capsid surrounded by a fatty envelope. E. They are all nonliving.