New world monkeys have all of the following features except
A. they have flat spreading noses.
B. they evolved in isolation in South America.
C. they are all arboreal.
D. they grasp objects with long prehensile tails.
E. they have ischial callosities (thickened rump pads).
Answer: E
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Plants, fungi and bacterial all have:
A. nuclei B. cell walls C. chloroplasts D. lysosomes E. mitochondria
Muscle contraction is regulated by:
A. depletion of acetylcholine, which returns the ligand-gated ion channel to the resting, closed conformation, preventing further transport of sodium ions. B. an ATP-powered sodium pump in the plasma membrane that continuously works to set up a sodium concentration gradient. C. an enzyme that degrades and removes acetylcholine from the neuromuscular junction. D. the resting neuron that does not release acetylcholine into the neuromuscular junction. E. All of these choices are correct.
Land ecosystems lose nitrogen to aquatic systems through ____
a. decomposition b. ammonification c. soil leaching d. bacterial fixation e. denitrification
Which cell membrane components are present in plant cells but absent in animal cells?
A) phospholipids B) plasmodesmata C) gap junctions D) proteins E) carbohydrates