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10 questions
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- Q1As food travels through the digestive system, it is exposed to a variety of pH levels. The stomach has a pH of 2 due to the presence of hydrochloride acid (HCl), and the small intestine has a pH ranging from 7 to 9. HCl converts pepsinogen into pepsin, an enzyme that digests proteins in the stomach. Which of the following most likely happens to pepsin as it enters the small intestine?It's activity increases to digest more proteins.It begins to replicate.It's shape changes to engulf large proteins.It becomes inactive.30sSC.912.L.18.1
- Q2In living cells, enzymes act as catalysts, which may reduce the amount of activation energy required for a chemical reaction to occur. In the graphs below, pathway x is a solid line representing the uncatalyzed reaction. The dotted line shows the catalyzed reaction. Which graph best illustrates the changes in a reaction when the catalyst reduces the amount of energy required?CABD30sSC.912.L.18.1
- Q3The diagram below shows the general structure of an amino acid. Which type of molecule is formed from amino acids?proteinsnucleic acidslipidscarbohydrates30sSC.912.L.18.1
- Q4You are analyzing a compound in the laboratory. You find that it is made up of carbon, hydrogen, and oxygen in a ratio of two hydrogen atoms for each carbon atom. How will you classify the compound?nucleic acidproteinlipidcarbohydrate30sSC.912.L.18.1
- Q5Fats, oils, and cholesterol are all types of what?fatty acidshormonescell membraneslipids30sSC.912.L.18.1
- Q6RNA and DNA are which type of macromolecules?nucleic acidcarbohydrateproteinlipid30sSC.912.L.18.1
- Q7What will most likely happen if an appropriate enzyme is added to a chemical reaction?The equilibrium of the reaction will be maintained.The reaction rate will decrease.The reaction will stop.The reaction rate will increase.30sSC.912.L.18.1
- Q8A sugar, a phosphate group, and a nitrogen base form the building blocks of which organic compound?carbohydrateslipidsproteinsnucleic acids30sSC.912.L.18.1
- Q9The human body maintains a temperature of around 98.6 degrees at all times. Enzymes are involved in almost every chemical reaction in the body. Which of the following describes the connection between these two statements?The body needs to be warm to prevent hypothermia.Enzymes function best at a specific temperature.There is no connection between the two statements.The body is kept relatively warm to prevent too much enzyme action.30sSC.912.L.18.1
- Q10The enzyme lactase will break down the sugar lactose into which of the following components?amino acidsmonosaccharidesphospholipidsnucleic acids30sSC.912.L.18.1
