Enzyme activity can be greatly affected by the pH and the temperature of the environment in which the enzyme must function.
Answer the following statement true (T) or false (F)
True
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What factor most limits a person's maximal increase in cardiac output during exercise?
A. The time it takes for electrical impulses to reach all parts of the heart B. The time available to fill the heart chambers with blood as the heart rate increases C. The total amount of blood in an individual D. The rate at which cardiac muscle contracts E. The rate at which oxygen is delivered to the cardiac muscle cells
Why are invasive procedures likely to increase the risk of nosocomial infections?
A) These procedures allow microbes from the skin to enter the bloodstream of the patient. B) Invasive procedures must use antibiotics. C) These procedures are carried out by health care workers, who carry resistant microbes. D) Invasive procedures require long term hospital stays, thereby increasing the number of visitors seen by the patient.
Three of the four statements below are true about energy and life. Select the exception.
A. Along with nutrients, energy gets cycled throughout the environment. B. Animals and decomposers are consumers and must get their energy and nutrients indirectly. C. Nutrients in the environment get cycled between producers and consumers. D. Producers get energy and simple raw materials from environmental sources and make their own food.
When, how, and to what extent any gene control
mechanism comes into play depends on a. the type of cell. b. the cell’s function. c. the cell’s chemical environment. d. signals from the cells external environment. e. all of these.