Which of the following structures allow for gas exchange between the tissues of a leaf and the atmosphere?

A) Cuticle
B) Epidermis
C) Vascular bundle
D) Stomata


Answer: D) Stomata

Biology & Microbiology

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If the effector protein phospholipase C failed to cleave phosphatidylinositol-4,5-bisphosphate (PIP2 ), the action of what enzyme would be affected?

A. cAMP B. IP3 C. protein kinase A (PKA) D. protein kinase C (PKC)

Biology & Microbiology

Describe the various effects of auxins in plants

What will be an ideal response?

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A molecule that closely resembles the shape of a substrate for an enzyme and that decreases the activity of the enzyme would most likely serve as a(n)

A. noncompetitive inhibitor. B. allosteric inhibitor. C. allosteric activator. D. competitive inhibitor.

Biology & Microbiology

Which of the following is most likely to occur when a tumor-suppressor gene is mutated?

A. The resulting tumor-suppressor protein would further suppress cell proliferation. B. The tumor-suppressor gene and resulting protein may lose its function and ability to suppress cell proliferation. C. The tumor-suppressor gene may be overactive. D. The resulting tumor-suppressor protein would activate an oncogene. E. None of the choices are possible.

Biology & Microbiology