Excitatory neurotransmitters encourage the generation of new electrical impulses by which one of the following?
A) stimulating saltatory conduction
B) stimulating depolarization of postsynaptic neurons
C) inhibiting postsynaptic neurons from repolarizing
D) inhibiting presynaptic neurons from depolarizing
E) stimulating depolarization of presynaptic neurons
B
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How many haploid sets of chromosomes are present in a diploid individual cell with a chromosome number of 46? 32?
What will be an ideal response?
As plants invaded the land, all of the following were true EXCEPT
A. there was a greater availability of light for photosynthesis. B. there was an increased threat of desiccation of unprotected cells. C. there was an increased threat from predation by animals. D. there was a greater concentration of carbon dioxide available in the atmosphere.
List the four processes, in one sentence each and in the proper sequence, involved in fertilization. What will be an ideal response?
A group of ten tomato plants are germinated and maintained in a large tray with no drainage. After several weeks they all begin to wilt and die despite repeated watering and fertilization. The most likely cause of this die-off is _____
A) competition for resources B) a lack of oxygen for the roots C) organic nutrient depletion D) no room left for root growth