The synaptic cleft is
A. a deep furrow in a postsynaptic cell where signals are received.
B. specialized channels in the presynaptic membrane that allow the passage of ions.
C. the narrow extracellular space between the presynaptic and postsynaptic neurons at the synapse.
D. recesses in the postsynaptic neuron membrane where neurotransmitters bind.
E. the area of neuronal membrane between the dendrites and the axon hillock.
C. the narrow extracellular space between the presynaptic and postsynaptic neurons at the synapse.
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Which of the following is true regarding transformed cells that are plated on growth media containing ampicillin?
A. Each colony began with one antibiotic resistant cell. B. All cells in a single colony are resistant to the antibiotic ampicillin. C. Only the founder cell of a single colony is resistant to the antibiotic ampicillin. D. Cells that did not take up the plasmid will survive on the medium. E. Each colony began with one antibiotic resistant cell and all cells in the colony are resistant to the antibiotic ampicillin.
What is the difference between a first messenger and a second messenger? Give an example of each. What will be an ideal response?
Mendel’s principle of independent assortment describes the segregation of paired factors during the formation of
gametes. __________________ Indicate whether the statement is true or false.
Evolution through natural selection will occur most rapidly for populations of plants that
A. are already well adapted to the environment. B. live in an unchanging environment. C. are in the same genus. D. reproduce sexually and live in an unstable environment