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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Earth is tilted about how many degrees on its axis?

A. 8 B. 15 C. 23 D. 30 E. 38

Biology & Microbiology

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.

Biology & Microbiology