In the accompanying figure, what is the role of the structures between the membranes?
a. They provide structure to plant cells.
b. They provide anchorage points between adjacent cells.
c. They allow passage of materials through intercellular spaces.
d. They prevent the passage of materials through intercellular spaces.
e. They allow the transport of small molecules and ions between adjacent cells.
e
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Which of the following is generally notinvolved in gene inactivation by histone modification?
A. Modification leads to chromatin condensation. B. The RNA polymerase associated with the gene dissociates from DNA when HDACs bind to the corepressor. C. Increased acetylation of the nucleosomes occurs in the vicinity of the gene. D. Increased methylation of the nucleosomes occurs in the vicinity of the gene.
The maximum membrane potential that an ion gradient can produce is the
A) action potential. B) membrane potential. C) equilibrium potential. D) threshold potential. E) resting potential.
Action potentials occur when the transmembrane potential of a neuron reaches threshold. Where is the action potential initiated on the neuron?
a. Dendrite b. Soma c. Axon hillock d. Axon
Transfer of random pieces of DNA mediated by phage is known as
A. transformation of competent cells. B. generalized transduction. C. conjugation. D. transposition. E. specialized transduction.