The presynaptic neuron and postsynaptic neuron do
not directly contact each other because
a. one would inhibit the actions of the other.
b. they never grow to sufficient length.
c. the synaptic vesicles keep them apart.
d. this would cause continuous impulse
transmission.
e. acetylcholine prevents this action
Answer: d
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Plants produce sugars from
a. oxygen and carbon dioxide. b. sunlight and water. c. oxygen and water. d. carbon dioxide and water. e. iron and water.
Natural selection __________.
A. relies on variation among individuals in a population B. is independent of time or place C. and evolution cannot be directly observed D. is more of a creative process than an editing process
Availability of water, space and food are all examples of ________ factors that influence the fitness of individuals.
Fill in the blank(s) with the appropriate word(s).
One assumption about plant reproduction is that because it requires so much matter and energy, reproductive output is resource-limited. Which statement provides evidence that this assumption may be incorrect?
A) There is a correlation between the amount of sunlight a plant receives and how much fruit it produces. B) Hand-pollinated plants produce more seeds than naturally pollinated plants. C) Plants growing in moist conditions produce more flowers than plants growing in dry conditions. D) Domesticated plants produce more seeds than wild plants.