Which of the following is NOT a characteristic of enzymes?

D. They are always active on more than one kind of substrate.

Which of the following statements concerning the states of matter is NOT true?

D. Liquids have no definite shape and no definite volume.

A chemistry experiment is performed to determine the effect of a nonvolatile solute on the boiling point of water. Three trials are performed in which 10 mg, 20 mg, and 30 mg of salt are added to 500 mL of distilled water. Each solution is heated on a hot plate, and the elevated boiling points are recorded. Determine the dependent and independent variables in this question.

A. The independent variable is the amount of salt, and the dependent variable is the temperature at which the water boils.

Which of the following statements best defines an organelle?

C. Specialized structures within a cell

Which of the following is NOT provided as a result of the valid research and observations recorded by scientists?

C. The ability to prevent earthquakes and other natural disasters

Which of the following does NOT obey the law of independent assortment?

A. Two genes next to each other on a chromosome

Which of the following statements is FALSE?

D. A tissue contains a single cell type that works to perform a specific function.

Your class is competing with another class to determine who has the best plant color. Your class decides to test a couple of solutions to determine which would be best for overall plant color before competing. Starting with four sets of four plants, the class decides to water each set with a different solution. They water them once a week with 200ml of the following solutions: water, diet soda, 1% bleach solution, and a 1% salt solution. All plants are placed in the window that receives the recommended amount of light. After a month of testing, your class notices that only two plants are alive, but one of those two does not look healthy. Based on these results, which of the following would be a good hypothesis to design the next experiment around?

A. Plants need more than 200 mL of liquid per week.

Which of the below is the best definition for the term circulation?

A. The transport of oxygen and other nutrients to the tissues via the cardiovascular system

Given that there are over 100 million residential addresses in the United States, which of the following best describes a flaw of this survey as it is described?

A. There were not enough age groups to show a trend based on age.

Which of the following conclusions is supported by the data from this survey?

C. In the United States, most people use screens more than 3 but less than13 hours a day

Enzymes catalyze biochemical reactions by ________

D. Lowering the activation energy of the reaction

A doctor needs to convince his boss to approve a test for a patient. Which statement below best communicates a scientific argument that justifies the need for the test?

C. The patient's symptoms and health history suggest that this test will enable the correct diagnosis to help the patient.

Which of the following is an example of a chemical change?

D. Including baking soda in a recipe to make it less sour

Which of the following is true regarding adipocytes?

B. They are responsible for storing the fat that is found in adipose tissue

Homeostasis is defined as:

D. Tendency of the body to maintain a stable environment

Which of the following are examples of homeostatic mechanisms?

D. Shivering when the body temperature falls, Secreting insulin to decrease blood sugar concentration, Increasing heart rate when blood pressure is low

Which of the following best describes the result of using a catalyst in a chemical reaction?

A. The reaction is completed in a shorter amount of time

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Question 1 of 50

Which structure of the nervous system carries action potential in the direction of a synapse?

A. A. Cell body

B. B. Axon

C. C. Neuron

D. D. Myelin