Photorespiration lowers the efficiency of photosynthesis by
A) carbon dioxide molecules.
B) 3-phosphoglycerate molecules.
C) ATP molecules.
D) ribulose bisphosphate molecules.
E) RuBP carboxylase molecules.
Ans: B) 3-phosphoglycerate molecules.
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In the figure above, at which of the numbered regions would you expect to find cells at metaphase?
A) I and IV B) II only C) III only D) IV only E) V only
Which of the following is true of the structure of the TPP riboswitch only when bound to thiamine pyrophosphate?
A. The conformation of the riboswitch allows the ribosome to access the Shine-Dalgarno sequence. B. The riboswitch folding creates a binding site for the ribosome. C. The riboswitch RNA becomes catalytically active to cleave mRNA. D. The riboswitch is less susceptible to cleavage by ribonuclease.
Bioactive specialized compounds are ____
a. synthesized in some plants as part of basic metabolism b. only synthesized in plant leaves c. molecules that attract herbivore pollinators d. synthesized in floral structures to attract pollinating insects e. only synthesized in plant roots
What hypothesis were Ellison and Gotelli testing when they manipulated concentrations of nutrients available to pitcher plants?
A. Providing extra light would increase the need for nutrients. B. Cutting leaves would diminish the need for more nutrients. C. Providing extra nutrients would reduce the need for extra leaves. D. Providing extra nutrients would increase photosynthetic leaf surface area. E. Providing extra light would increase leaf production.