Edmentum PLATO Course Biology with Virtual Labs, Semester A End of Semester Test 2023 (3942) questions and answers

Which phrase indicates a limit to the scientific accuracy of the experiment? For the study of a particular drug, Marcus proposes an experiment with a particular population. Approximately 200,000 people in the United States take this drug. He started out with a sample size of 300 people. First, he conducts research on the medical history of the people in his study. He collects the information using reliable sources. He decides to repeat the experiment using a larger sample size. a sample size of 300 people To further scientific knowledge, what four steps should scientists take after they analyze their results? Draw conclusions about their data. Determine whether the results are in the best interests of their company. Discuss the pros and cons of the experiment with experts. Publish the results in a scientific journal. Conduct seminars and presentations about their experiment. Draw conclusions about their data. Discuss the pros and cons of the experiment with experts. Publish the results in a scientific journal. Conduct seminars and presentations about their experiment. Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:00 / 0:15 Full screen Brainpower Read More PARTIALLY WRONG A scientist decides to study the effect of salt on a particular type of bacteria. Arrange the steps of the scientific method in the correct order to show how the scientist would proceed with his work. WRONG 1. The scientist asks the question, Does salt help the growth of these bacteria? WRONG 2. The scientist forms a hypothesis that higher concentrations of salt may increase the growth of the types of bacteria. WRONG 3. The scientist puts the bacteria in three different environments: high salt, medium salt, and low salt. WRONG 4. A microbiologist notices that some bacterial species thrive in salt water environments. CORRECT 5. The scientist finds that the high-salt environment has the most bacteria. CORRECT 6. The scientist publishes his report in a scientific journal. Carbohydrates are the primary source of energy for the human body. If your body lacks enzymes that break down carbohydrates, it would be unable to get _______ for energy production. If you lacked the enzyme to digest proteins, you may not absorb enough ____ sugar molecules amino acids Why are certain amino acids called essential amino acids? B. because they are not manufactured by the body Which of the following is a correctly balanced equation? B. 2HgO → 2Hg + O2 PARTIALLY WRONG Before the discovery of cells, people believed in the theory of spontaneous generation. According to this theory, living things can come from nonliving things. On the basis of this theory, people believed that maggots that formed on cheese spontaneously arose from the cheese. Which two statements disprove this theory of spontaneous generation? WRONG - Living cells can only come from previously existing matter. CORRECT - Cells form from previously existing cells. Brenda and her friend are relaxing in a paddleboat, slowly working the paddles with their legs to move the boat. Which organelles in the muscle cells of Brenda's legs enable Brenda to have the energy for this activity? C. mitochondria In the plant cell shown here, identify the organelles that also play a role in the structure for the entire plant. cell wall cytoskeleton vacuole Explain the process in which hormones secreted by the pancreas function with respect to increased glucose levels in the blood. 1. high amount of glucose in the blood, sending signals toward the pancreas 2. synthesis of hormones by beta cells 3. binding of hormones with receptors on the liver 4. intake of glucose molecules from the blood by specific transporters 5. release of hormones from the receptors A researcher conducted studies on proteins obtained from mouse livers. He discovered a novel protein and decided to study its genetic origins. During his tests, the researcher found the mRNA sequence AUUCGGUACUGUACUAGC. What is the DNA sequence that was used for synthesizing this mRNA sequence? C. TAAGCCATGACATGATCG A scientist studied the formation of the protein hemoglobin and made a chart to show the steps in the process. Arrange the labels to complete the steps for the formation of hemoglobin. 1. DNA molecule is "unzipped"in nucleus 2. RNA polymerase is used to build a mRNA molecule 3. mRNA travels to a ribosome where its codons will be "read" 4. amino acids released by tRNAform peptide bonds Neurons transmit signals to the central nervous system. The brain processes this information to initiate a response. Two neurons communicate with each other through the___. The _____ is released at the site to initiate action potential and carry the signal through the body. synapse neurotransmitter A physician examines a patient who complains of breathing problems. She finds fluctuations in the patient's blood pressure and heart rate. The physician thinks it's because of a brain injury. Which part of the brain is affected? C. medulla oblongata Ryan accidentally drops a very heavy object on his foot. In a matter of just a few seconds, he feels a tremendous amount of pain. He experienced the pain quickly because neurons rapidly carried the impulse to the brain. Which structure of the neuron is responsible for the quick transmission of a nerve impulse? The second square on the top, B Juan picks up a steel utensil and immediately drops it because it's extremely hot. How does the reflex arc work to protect Juan from a worse burn? In a reflex arc, the_____ neuron carries the action potential from the_____. motor spinal cord to the muscle