If the first sphincter of the digestive tube does
not operate properly, what condition could
result?
a. stomach ulcers
b. small intestine ulcers
c. tooth decay
d. heartburn
e. constipation
D
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In prokaryotes, the genes for metabolic pathways are ____
a. always expressed for early steps in the pathway, but generally not expressed for later steps in the pathway b. always expressed so the bacteria can respond to rapidly to changing conditions c. turned on and off as conditions change d. always independently regulated e. generally expressed at low levels, but expressed at high levels when conditions warrant
Ascaris lumbricoides
A. larvae migrate to the pharynx, get swallowed, and return to intestines to mature. B. spreads to humans by ingestion of Ascaris eggs in food. C. is an intestinal roundworm. D. larvae penetrate into lymphatics and capillaries around intestines. E. All of the choices are correct.
Nerve impulses from the vestibular apparatus travel to reflex centers in the ____
a. spinal cord b. brain stem c. cerebral cortex d. hypothalamus e. thalamus
Only charged atoms can form ionic bonds.
Answer the following statement true (T) or false (F)