In the plasma membrane, the phospholipid heads
A) are hydrophilic and face outward toward the aqueous solution on both sides of the membrane.
B) are hydrophilic and face inward, shielded from water.
C) are hydrophobic and face outward toward the aqueous solution on both sides of the membrane.
D) are hydrophobic and face inward, shielded from water.
Answer: A
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The two kinds of bone tissue are
(a) compact and loose. (b) compact and spongy. (c) dense and spongy. (d) loose and dense.
What happens to the enzyme rubisco during photorespiration?
A. The enzyme speeds up the formation of glucose. B. The enzyme's active site binds to O2 instead of CO2. C. The enzyme becomes denatured. D. The enzyme catalyzes the breakdown of glucose.
growth as the cell prepares to divide
What will be an ideal response?
The main reason certain seeds germinate near the soil surface rather than deep in the soil is
A. they are then more aware of their surroundings. B. they require light to germinate. C. they need additional oxygen. D. they are sensitive to the cold temperatures of the soil. E. they have water deprivation.