Which phrase describes proteobacteria?
a. They are Gram-positive and include the purple bacteria.
b. They are Gram-negative and include the green bacteria.
c. They are Gram-negative and include the purple bacteria.
d. They are Gram-positive and include the green bacteria.
Ans: c. They are Gram-negative and include the purple bacteria.
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Indicate whether the statement is true or false
Hydrogen ions (H+) are _____
a. indicated by a pH scale c. in blood b. unbound protons d. all of these
In the process of differentiation,
a. some daughter cells usually receive varying assortments of genes. b. cells with identical assortments of genes come to have different individual genes expressed. c. cells become specialized as a result of meiosis. d. daughter cells acquire different characteristics as a result of mutations that have occurred. e. all of these occur
Different scientists have speculated about how the first living thing appeared on Earth. All of the following are supported by evidence EXCEPT
A. origin on Earth of a photosynthetic autotroph. B. origin on Earth of a chemosynthetic autotroph. C. origin on Earth of an anaerobic heterotroph. D. an organism arrived from an extraterrestrial source.