Bone mass typically increases until the approximate age of ____
a. 10
b. 15
c. 25
d. 35
e. 45
ANSWER: c
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You give up on the garden and ignore it for a third summer. You notice that two small birch trees sprout and begin to grow among the sunflowers
The birch trees are slower growers than the sunflowers, but by the fifth summer they start to shade the sunflowers. The birch trees and the sunflowers are in competition for: A. water. B. light. C. nutrients. D. All of the responses are correct. E. None of the responses is correct because competition only occurs between members of the same species.
In an allergic reaction, allergens bind ________, which release allergy mediators.
A) IgE antibodies on mast cell surfaces B) IgG antibodies on B cell surfaces C) allergy genes on chromosome 5 D) histamines on mast cell surfaces
Most monocots have numerous ____ roots arising from the stem
a. adventitious b. primary c. fibrous d. secondary e. tap
During chemiosmosis,
A) energy is released as H+ ions move freely across mitochondrial membranes. B) ATP is synthesized when H+ ions move through a channel in ATP synthase. C) a concentration gradient is generated when large numbers of H+ ions are passively transported from the matrix of the mitochondrion to the mitochondrion's intermembrane space. D) H+ ions serve as the final electron acceptor.