Explain how the resting membrane potential and resting ion distributions are established in a neuron

What will be an ideal response?


ANSWER: A resting membrane potential of -70 mV is established due to the unequal distribution of
ions across the neuron plasma membrane. Na+/K+ pumps accumulate Na+ outside the
plasma membrane and K+ inside the plasma membrane, while the presence of negatively
charged anions inside the cell give the inside of the plasma membrane an overall negative
charge relative to the outside.

Biology & Microbiology

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Sexual reproduction:

A. results in offspring that are not genetically identical. B. results from combining genetic material from two gametes. C. results in a new generation that is not genetically identical to its parents. D. results in a new generation with the same number of chromosomes as the parents. E. All of these choices are correct.

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Insectivorous plants such as the Venus flytrap, pitcher plant, and bladderworts often grow in  

A.  alkaline soil. B.  sandy soil. C.  clay soil. D.  marshes. E.  acidic soils.

Biology & Microbiology

Which of the following could likely play a role in causing cancer?

1.Cells adhere too strongly to one another, causing a tumor to form. 2.Kinase enzymes add phosphates onto proteins that regulate the cell cycle. 3.The cell cycle skips interphase. 4.Checkpoint proteins make cells “commit suicide.”

Biology & Microbiology

The direct visualization of a developing fetus to diagnose disorders is called

a. chorionic villus sampling. b. preimplantation diagnosis. c. amniocentesis. d. fetoscopy. e. senescence.

Biology & Microbiology