Which of the following is a function of the steep Na+/K+ gradient across the cell membrane?
Provides energy for coupled transport
Creates electrochemical gradient
Maintains osmotic pressure
All of the choices are correct.
all of the choices are correct
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The figure shows a simplified phylogeny of closely related species of primates. This tree was proposed by comparing DNA sequence changes in the gene for cytochrome oxidase subunit II. The vertical scale represents time and the branch points represent common ancestors. What species did ancestor B give rise to?
A. Siamangs and orangutans.
B. All of the species except orangutans.
C. All of the species except siamangs.
D. All of the species except siamangs and pigmy chimps.
What is an example of a sessile organism?
a. dog b. coral c. snake d. bird e. earthworm
DNA is found in every cell of an organism. What subset of DNA changes would be most useful to molecular biologists to determine evolutionary relationships?
A) DNA changes that occur in genes specific to organisms in one kingdom B) DNA changes in genes that are shared by a common ancestor C) DNA changes in genes that occur in body cells and cannot be passed to offspring D) DNA changes in genes that do not generally code for any function
Allopolyploidy is a significant factor in the evolution of which type of organism?
a. fungi b. animals c. bacteria d. protozoa e. flowering plants