Which of these organisms helped biologists determine the contents of phloem?
A) Aphids
B) Ants
C) Termites
D) Grasshoppers
E) Leafhoppers
A
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Land plants are thought to be most closely related to the ____
a. chlorophyte algae b. red algae c. charophyte algae d. brown algae e. euglenoids
During contraction,
a. cross-bridges of muscle filaments are broken and reformed. b. ATP is used to break cross-bridges. c. muscle cells use glucose derived from glycogen as an energy source. d. glycogen depletion may lead to muscle fatigue. e. all of these occur.
Solutes and Water Activity: major stressor
What will be an ideal response?
If the cytoplasm of a cell is at pH 7, and the mitochondrial matrix is at pH 8, then the concentration of H+ ions _____
A) is 10 times higher in the cytoplasm than in the mitochondrial matrix B) is 10 times higher in the mitochondrial matrix than in the cytoplasm C) in the cytoplasm is 7/8 the concentration in the mitochondrial matrix D) in the cytoplasm is 8/7 the concentration in the mitochondrial matrix