Unit 2 Checkpoint 3 Open Notes Quiz

The equations represent two biochemical processes that occur in living organisms. The letter X represents a molecule produced from process 1.

ATP

Which statement is supported by the information in the graph below?

The enzymes respond in a similar way to changes in temperature.

The inability of an organism to produce certain proteins can occur when an organism is lacking an enzyme needed to combine

amino acids

In living cells, chemical processes, such as synthesis, all require the action of

biological catalysts

Hydrogen peroxide (H2O2), a byproduct of cellular metabolism, is broken down by the enzyme catalase which is produced by nearly all organisms. When catalase is added to hydrogen peroxide, a reaction occurs that produces bubbles of oxygen gas (O2) and water (H2O). 2H2O2 → 2H2O + O2 The laboratory setup represented below was used to investigate the effect of pH on the breakdown of H2O2. Five setups were made with H2O2 solutions, each at a different pH level. Catalase was added to the solution in the first setup and the reaction proceeded for one minute and the amount of gas produced by the reaction was recorded on the data table. This exact procedure was repeated with the other four setups containing different H2O2 solutions. Based on the investigation, the student should conclude that enzymes

function best within a specific range of conditions

An experiment was carried out to answer the question "Does the pH of water affect the growth of radish plants?" Two groups of ten radish plants were set up. One group was watered with water having a pH of 3.0, and the other group was watered with water having a pH of 7.0. Both groups of plants received the same amount and intensity of light, the same amount of water, and they were grown in the same type of soil. The heights of the radish plants were measured every 2 days for a period of 2 weeks. What was the dependent variable in this experiment?

heights of the plants

In the human body, carbon monoxide reduces the amount of oxygen than can be transported to cells. Breathing in to much carbon monoxide will most likely result in the production of

less ATP

Which process uses energy to combine inorganic molecules to synthesize organic molecules?

photosynthesis

Which process will result in a gain of energy in an ecosystem?

photosynthesis in algae cells

The function of an enzyme is influenced by its

physical shape

An experiment was carried out to answer the question "Does the pH of water affect the growth of radish plants?" Two groups of ten radish plants were set up. One group was watered with water having a pH of 3.0, and the other group was watered with water having a pH of 7.0. Both groups of plants received the same amount and intensity of light, the same amount of water, and they were grown in the same type of soil. The heights of the radish plants were measured every 2 days for a period of 2 weeks. Which activity might help to increase the validity of this experiment?

repeating the experiment several times

Photosynthesis and respiration are alike in that they both

require specific catalysts

Even though human proteins are synthesized from only 20 different amino acids, there are thousands of different proteins found in human cells. This great variety of proteins is possible because the

sequence and number of amino acids can be different in each protein

A fully functioning enzyme molecule is arranged in a (tertiary structure) complex three-dimensional shape. This shape determines the

specific type of molecule it interacts with during a reaction

A cell in the leaf of a corn plant contains more chloroplasts than a cell in the stem of a corn plant. Based on this observation, it can be inferred that, when compared to the cell in the stem, the cell in the leaf

uses more carbon dioxide