The binding of substrate to enzyme creates a(n):
What will be an ideal response?
enzyme-substrate complex
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The toxin of Vibrio cholerae causes severe diarrhea because it ____
a. modifies DAG and activates a cascade of protein kinases b. activates phospholipase to produce inositol triphosphate c. decreases the cytosolic concentration of Ca++ d. modifies a G protein involved in regulating salt and water secretion e. binds with adenylyl cyclase and triggers formation of cAMP
Which of the following is typical of cancer cells?
a. Products of oncogenes inhibit mitosis. b. Benign tumors invade normal tissue. c. Malignant cells migrate. d. Cancer cells lose the ability to divide. e. The parent cell of the tumor contains a single mutation in a single checkpoint gene.
Which is a component of the fossil record?
A. bones of dinosaurs B. the distribution of murid rodents in Australia and Asia C. information about geological formations
All of the following statements about the cohesion-tension model are true EXCEPT
A. it is a model of how water and minerals are transported in xylem. B. it is dependent on the cohesive and adhesive properties of water. C. there is no expenditure of energy. D. tension created by transpiration in the leaves pulls water along the phloem from the roots hairs to the leaves.