Which statement concerning REM sleep is true?
a. During the REM stage, delta waves are emitted.
b. Most people spend almost all of their sleep time in the REM stage.
c. The preoptic area of the hypothalamus stimulates REM sleep.
d. During REM sleep, blood flow to the entire brain decreases.
e. REM sleep is absolutely necessary, as a lack of this stage causes anxiety and irritability.
E
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The key feature in an experiment changed from one treatment to the next is referred to as a ____
Some help with this one? Thanks.
In a freshwater pond, a green alga is likely to be
A) colonial. B) filamentous. C) unicellular. D) colonial, filamentous, multicellular, or unicellular.
The lacA gene found within the lac operon encodes for galactosidase transacetylase. This enzyme attaches a(n) ________ group to lactose and lactose analogs.
A. amino B. hydroxyl C. carbonyl D. acetyl E. carboxyl
_____ prevents seeds from germinating until conditions are favorable for the growth of the plant
A) Ethylene B) Zeaxanthin C) Gibberellin D) Abscisic acid