Why do organisms that share a common environment often also share common features?
a. Living in close proximity leads to inter-breeding of the species.
b. They likely share common parasites as well, and the parasites are responsible for horizontal gene transfer between the species.
c. Sharing a common environment means they face similar environmental pressures.
d. Over time, species that cohabitate start to look alike.
c. Sharing a common environment means they face similar environmental pressures.
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The function of xylem is to ____
a. conduct water downward in the plant b. transport food upward in the plant c. transport water and minerals d. transfer materials from leaf to stem e. contain sieve tubes
The operation of a synapse
a. results from the passage of an electrical charge across the gap. b. involves a transmitter substance from vesicles in the presynaptic neuron that acts upon a receptor site in the postsynaptic neuron. c. occurs only between two nerves. d. is limited only by the action of acetylcholinesterase. e. requires neurotransmitter to pass directly through the plasma membrane of a postsynaptic nerve.
Which of the following intermediate filament proteins is incorrectly matched with the cell type in which it is found?
A) keratin - epithelial cells B) desmin - smooth muscle cells C) vimentin - mesenchymal cells D) nestin - connective tissue cells E) GFA protein - glial cells
Enzymes required for DNA replication are synthesized during the G1 phase
__________________ Indicate whether the statement is true or false.