Explain how enzymes are regulated by feedback inhibition.
What will be an ideal response?
Enzymes can be regulated by a mechanism called feedback inhibition, where the product of the reaction acts as the repressor. Enzyme inhibition can occur in two ways. Competitive inhibitors compete with the substrate for the same binding site. Noncompetitive inhibitors can bind to the enzyme at the allosteric site, changing the shape of the enzyme and making it unable to bind to the substrate.
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Which event probably made the evolution of cellular respiration possible?
a. accumulation of carbon dioxide in atmosphere b. emergence of prokaryotes c. accumulation of oxygen in atmosphere d. emergence of eukaryotes e. emergence of plants
Which trait is governed by the X chromosome?
a. Distribution of body fat b. Color perception c. Distribution of hair d. Blood clotting e. All of these choices.
While oncogenes are responsible for cancer cells, tumor-suppressing genes are responsible for
tumorous tissues. Indicate whether the statement is true or false.
The movement of substances to regions of lower concentration is called
A. pinocytosis. B. exocytosis. C. diffusion. D. active transport. E. pumping.