Which one of the following is considered to be an important plant hormone that helps plants cope with environmental stresses?
A. abscisic acid
B. auxins
C. ethylene
D. cytokinins
E. prostaglandins
Answer: A
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. The substance that typically provides rigidity to fungal cell walls, and is found in some animals, is
____.
a. lignin b. cellulose c. starch d. collagen e. chitin
Why is photosynthesis considered an endergonic reaction?
A) Photosynthesis does not comply with the physical laws of the universe. B) Low-energy reactants are converted to high-energy products. C) Activation energy is not required. D) Sugar has less energy than does the sun. E) Protein catalysts are not needed.
Which is not specifically targeted for destruction by the proteasome?
A. oxidized proteins B. phosphorylated proteins C. misfolded proteins D. damaged proteins E. short-lived, regulatory proteins
The leading cause of extinction by human activities worldwide is
A) habitat fragmentation. B) predation. C) pollution. D) invasive species. E) overexploitation.