A covalent bond forms when both atoms require electrons to become stable.
Answer the following statement true (T) or false (F)
True
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Collectively, reactions that break down molecules are known as
A) anabolism. B) metabolism. C) synthesis reactions. D) exchange reactions. E) catabolism.
______________, the natural replacement of feathers, occurs in birds once or twice per year
Fill in the blank(s) with correct word
What statement best describes the resting state of a neuron?
A) Neurons are polarized with more sodium ions outside the cell and more potassium ions inside the cell. B) Neurons are propagating the action potential. C) Neurons are depolarizing and generating an action potential. D) Neurons are restoring the ionic conditions utilizing the sodium-potassium pump. E) Neurons are repolarizing as potassium ions diffuse out of the cell.
When a baby suckles at its mother's breast the stimulus at the breast is sent to the mother's brain (a region called the hypothalamus)
The brain responds by releasing hormones to stimulate the production and the ejection of milk from the breast. This helps the newborn to receive nourishment and encourages more suckling. This example is best described as a ________. A) negative feedback B) necessary life function C) loss of homeostasis D) positive feedback