How is summation related to IPSPs and EPSPs? What is the difference between temporal summation
and spatial summation? What will be an ideal response?
Concepts to Consider: Individual IPSPs or EPSPs may be subthreshold. However, the effect they
have on the membrane potential are additive. Temporal summation occurs when EPSPs arrive close
together, with the second arriving before the first has decayed. Spatial summation occurs when the
postsynaptic neuron is stimulated by the release of neurotransmitter from several closely spaced
synaptic terminals. When this happens the postsynaptic neuron is stimulated at several places at the
same time.
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your having only one allele for the disorder are
a. 1/4. b. 1/2. c. 3/4. d. 1. e. 0.
The letter “D” in the above figure represents
a. sclerenchyma fibers. b. parenchyma. c. xylem. d. epidermis. e. phloem.
Heavy rains cause water speed in a river to increase and the river to overflow its banks. A scientist who has studied the river wants to determine the effects of this rain event on the river's ecological community. How could the scientist safely investigate these effects?
a) by sampling organisms directly during and after the rain event b) by sampling organisms directly only after the rain event c) by setting out equipment to measure water flow during the rain event d) by taking pictures during and after the rain event
Which organelle would be more abundant in a sperm cell than a skin cell since it has to move?
a) mitochondria b) ribosomes c) chloroplast d) nuclei