What is the purpose of the sacB negative-selection marker in allelic exchange using a suicide vector? Which of the following will cause the reaction time of a reflex to increase?

(a) great sensitivity of the receptors for the reflex

(b) a large number of neurons and their associated synapses

(c) rapid nerve conduction velocity

(d) rapid activation of the effector

Part of the brain that is responsible for the fact that the right cerebrum moves right side of the body and vise versa is the

(a) Brain stem

(b) Pons

(c) Hypothalamus

(d) Medulla oblongata

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