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.
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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.
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.
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.”
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.