Which best explains how Australia has distinctive organisms, such as marsupials, that cannot be found anywhere else
on Earth?
a. Australia has an unusual climate that has triggered natural selection.
b. There are fewer species of organisms in Australia than most continents.
c. Australia experienced a significantly slower rate of evolutionary change.
d. The predators of marsupials eliminated the populations in other locations.
e. Australia was separated and isolated from other land masses for a long period of time.
e
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A gene mutation
a. is a temporary change in the nucleotide sequence of DNA. b. may be caused by environmental agents. c. always arises spontaneously. d. occurs only in eukaryotes. e. is always damaging to the organism.
The problem below relates to the synthesis of several intermediates in the citric acid cycle, which is essential in the production of ATP through aerobic respiration
A set of experimental results relating the growth (+) of Neurospora on several media is given in the table. Based on the information provided, present the biochemical pathway for the substances oxaloacetate, fumarate, malate, and succinate and the locations of the metabolic blocks produced by the various strains. Strain Medium MM MM MM MM MM + oxaloacetate + fumarate + malate + succinate l62 - + - + - l36 - + - - - l41 - + + + - MM = minimal medium
Good rubrics and the information they provide can help with all of the following EXCEPT:
a. Assign accurate grades b. Differentiate instruction c. Distribute selected response items d. Help students self-assess
Certain proteins of the complex motor that drives bacterial flagella are modified versions of proteins that had previously belonged to plasma membrane pumps. This evidence supports the claim that _____
A) natural selection produces organs that will be needed in future environments B) the motors of bacterial flagella must have originated in other organisms C) natural selection can produce new structures by coupling together parts of other structures D) bacteria that possess flagella must have lost the ability to pump certain chemicals across their plasma membranes