Which element is likely to be chemically unreactive?
a. chlorine (7 valence electrons)
b. calcium (2 valence electrons)
c. argon (8 valence electrons)
d. carbon (4 valence electrons)
e. potassium (1 valence electron)
ANSWER: c
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In a neuron at rest, the membrane is most permeable to
A. potassium. B. sodium. C. chloride. D. calcium. E. magnesium.
Which tissue is part of the wood of a tree, not the bark?
A) cork B) cork cambium C) xylem D) phloem
Which of the following is an adaptation to increase the surface area of a part of a cell that is involved in cellular respiration?
A) the cristae of a mitochondrion B) the outer membrane of a chloroplast C) the grana of a chloroplast D) the endoplasmic reticulum
The first stage of aerobic respiration is a series of biochemical reactions called the Calvin cycle.
a. true b. false