You are studying enzymes in biology class. hydrogen peroxide (h2o2) is produced as a byproduct of respiration. hydrogen peroxide is harmful to cells and must be continually broken down. catalase is an enzyme found in living cells that speeds up the breakdown of hydrogen peroxide into water and oxygen (2 h2o2 → 2 h2o + o2). you are working with your lab group to investigate what factors influence the rate of the peroxide reaction. your lab group is provided with liver samples as a source of catalase, as well as 3% hydrogen peroxide. you decide to investigate if adding more enzyme will cause the reaction to proceed faster. you set out to prove the hypothesis: if more catalase is provided, then the rate of the peroxide reaction will be faster. what would be a good choice for your independent variable? a) 3,5, and 10 g samples of liver b) measuring the amount of oxygen produced c) 1%, 3%, and 10% concentrations of hydrogen peroxide d) 10 ml, 20 ml, and 30 ml volumes of hydrogen peroxide

The correct answer would be a) 3,5, and 10 g samples of liver.

Independent variable in any experiment refers to the variable which is being kept controlled or changed to check its effect on the dependent variable.

In contrast, the dependent variable is the one whose value depends on the independent variable.

For example, in the given hypothesis the rate of a reaction depends upon the amount of enzyme catalase.

Thus, amount of enzyme or its source (liver) forms the independent variable and the rate of reaction forms the dependent variable.

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong

you know that this symptom is misleading and quite often is related to: heart attack

a heart attack is a condition that occurs when the blood flow that transports oxygen to the heart muscle is damaged or cut off completely. the coronary arteries that supply the heart muscle with blood flow can be blocked by the accumulation of plaque. also, when the plaque within the heart artery breaks, it creates blood clot that can also hinder the blood flow. men that are over 45years of age and women that are over 55years of age are at risk of having a heart attack. the symptoms of a heart attack include chest discomfort, chest pain, coughing, and shortness of breath.