Four of the five answers listed below are
events occurring during mitosis. Select the
EXCEPTION.
a. crossing over
b. division of centromeres
c. chromosomes line up at the cellular equator
d. attachment of spindle microtubules to
centromeres
e. migration of chromosomes to opposite ends
of the cell
A
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Which of the following is true of chemotherapeutic agents?
A. They create broken chromosomes or stalled replication forks. B. The cytotoxic effect of these DNA damaging agents requires the cell to be actively dividing. C. These agents are toxic to cancer cells because they are actively dividing to form a tumor. D. The adverse side effects of chemotherapeutics are strongest in cell types that divide rapidly (hair, blood, and the gastrointestinal tract). E. All of these statements are true.
How do temporal and spatial summation improve the processing power of the brain?
A. Temporal summation allows circadian rhythms to regulate neuronal activity. Spatial summation allows latitude to regulate neuronal activity. B. Temporal summation allows a neuron to fire prolonged action potentials, and spatial summation allows a neuron to synapse onto new targets. C. Temporal and spatial summation both make the neuron more likely to fire action potentials. D. Temporal summation allows a neuron to recognize a persistent signal from a single presynaptic cell, and spatial summation allows a neuron to recognize a broad signal from multiple presynaptic cells. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content/Choose Answer · What do you already know about summation? What other information is related to the question? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What invention eventually led to current deep sea submersibles like Alvin?
a. Bathyscaphe b. Search-and-recovery vessels c. Diving bell d. Bathysphere
Primary and secondary antibody response differ in all the following ways, except
A. the lag period between antigen stimulation and antibody response is shorter in the secondary response. B. IgG production predominates in secondary responses. C. primary responses are active whereas secondary responses are passive. D. the rate of antibody production is faster in primary responses than in secondary responses.