Which is the main constituent of cell wall?
A. Cellulose
B. Pectin
C. Starch
D. Proteins
Select your answer:
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Biological Molecules and Enzymes › ViewExplain the role of enzymes in biological processes.
A. Enzymes inhibit chemical reactions by increasing activation energy.
B. Enzymes have no role in biological processes.
C. Enzymes speed up chemical reactions by lowering activation energy.
D. Enzymes are only involved in physical processes, not chemical reactions.
Ecology › View
The environment around Manchester, England, changed during the Industrial Revolution. How did this change affect peppered moths living in the area?
A. Natural selection favored moths with dark wings because predators could not see them on the soot-colored trees.
B. Natural selection favored moths with white wings that were easy for predators to see.
C. Natural selection favored moths with white wings because predators could not see them on the soot-colored trees.
D. Natural selection caused moths with white wings to become extinct.