The endosymbiotic theory suggests that both _____ were once free-living organisms that lived as parasites within ancient prokaryotes.

A) centrioles and nucleosomes
B) mitochondria and ribosomes
C) Golgi bodies and lysosomes
D) chloroplasts and mitochondria


Answer: D) chloroplasts and mitochondria

Biology & Microbiology

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How does the structure of the cardiac chambers reflect their different functions?

What will be an ideal response?

Biology & Microbiology

DNA and RNA are alike in

a. the pentose sugar. b. all the nitrogenous bases used to assemble the genetic code. c. the number of strands. d. their function in genetics. e. none of these.

Biology & Microbiology

The exact path that led to the evolution of modern cells and the organic molecules contained in these cells to support life is not known

The best guess is that some sort of self-replicating organic molecule formed along mudflats and most likely resembled A) single-stranded DNA. B) single-stranded RNA. C) small amino acids such as lysine and glycine. D) double-stranded DNA. E) ATP.

Biology & Microbiology

Each NADH that enters the electron transport system gives rise to ________ ATP.

A. 2 B. 38 C. 36 D. 3 E. 24

Biology & Microbiology