During electron transport phosphorylation,
which ions accumulate in the outer
compartment of the mitochondria?
a. calcium
b. hydrogen
c. oxygen
d. phosphorus
e. sodium
B
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How does the simple primary and secondary structure of DNA hold the information needed to code for the many features of multicellular organisms?
A) The hydrogen bonding among backbone constituents carries coded information. B) The base sequence of DNA carries the information needed to code for proteins. C) The width of the double helix changes at each gene due to differences in hydrogen bonds. D) The amino acids that make up the DNA molecule contain the information needed to make cellular proteins.
Which of the following statements best describes the difference between mitosomes and mitochondria?
A. Mitosomes are not involved in ATP production. B. Mitosomes are much larger than mitochondria. C. Mitosomes contain hydrolytic enzymes that help the protozoan digest food particles. D. Mitosomes have one membrane whereas mitochondria have a double membrane.
A gene has been discovered in a eukaryote that is identical to a gene of a bacterium that the eukaryote normally engulfs and digests. This is probably due to
A. vertical evolution. B. horizontal evolution. C. horizontal gene transfer. D. convergent evolution.
Which statement is true?
a. The ability to taste salty allows animals to find high-caloric food. b. Umami was the first taste to be identified by scientists. c. Both the senses of taste and smell create flavor perception. d. Animals are unable to accurately identify odors without taste receptors.