An enzyme is a _______. a) carbohydrate B) Protein C) DNA D) lipid Increasing th
ID: 91345 • Letter: A
Question
An enzyme is a _______. a) carbohydrate B) Protein C) DNA D) lipid Increasing the temperature generally _____ the rate of reactions, and decreasing the temperature generally ________ the rate of reactions. A) increases, increases B) decreases, increases C) increases, decreases D) slows, speeds A solution with a pH of 7 is considered A) neutral B) acidic C) alkaline D) basic E) both B and C are correct Which of the following statements accurately defines chemical reaction? A) Interaction between atoms or molecules in which chemical are formed, broken, or rearranged, or electrons are transferred between molecules B) The unequal sharing of electrons between two atoms C) The movement of solute from a high concentration to a low concentration D) Both A and B are correct Which of the following statements accurately defines solute? A) Substance present in a solution in higher amounts: often a liquid B) Substance present in a solution in lower amounts: often a solid C) Substance that release (donates) hydrogen ions: has a pHExplanation / Answer
45. B) Protein
(explanation - enzymes are biological catalysts which are mostly protein in nature.)
46. C) increases, decreases
(explanation - Temperature is a major factor that increases the rate of reaction. When the temperature is increased, rate of reaction also increases and vice versa. Temperature is directly proportionate with rate of reaction.)
47. A) neutral
(explanation - A pH scale mesures the acidity or the alkalinity of a substance. The scale ranges from 1 to 14. The pH = 7 is considered neutral.)
48. A) Interaction between atoms or molecules in which chemical bonds are formed, broken, or rearranged, or electrons are transferred between molecules.
( explanation - Chemical reaction is a process in which certain substances known as reactants are transformed into totally different substances called products by undergoing rearrangement of molecular structure.)
49. B) substance present in a solution in lower amounts, often a solid
(explanation - in a solution, the minor component i.e. the solute is dissolved in the major component i.e. the solvent.)
50. B) substance present in a solution in higher amounts, often a liquid.
( explanation - in a solution, the minor component i.e. the solute is dissolved in the major component i.e. the solvent.)