Unit Test — Unit test Answers

Cosmologists are scientists who study stars, galaxies, black holes, and other objects in the universe. In order to study the billions and billions of stars, cosmologists use highly advanced telescopes and create computer models to trace the stars’ motion.

A teacher gave the lab group shown below an “unsafe practice” warning.What is most likely the basis for the teacher’s warning?

Most scientists agree that saturated fats contribute to high levels of “bad” cholesterol in a person's blood, while monounsaturated fats and polyunsaturated fats lower this type of cholesterol in a person's blood. The table below shows data about fats in some common foods.Food (14 g)Saturated fat (g)Monounsaturated fat (g)Polyunsaturated fat (g)Canola oil1.08.93.9Margarine1.65.43.4Olive oil1.99.91.4Lard5.05.81.4Butter7.93.70.5Joyce and Linda are identical twins who are 50 years old and enjoy exercising daily. Joyce avoids eating any dairy or animal products and eats granola made with canola oil for breakfast. Linda prefers rich foods, and eats bacon, eggs, and buttered toast each morning. Which statement describes a logical inference that can be made from the provided information?

The classification system for organisms has changed from seven levels to eight. This happened because

Examine the following list of questions.1. Why are kids afraid of ghosts?2. Should I feed the raccoons that visit my trash can?3. How does mouse color affect mouse survival?4. Does a mother duck love her babies?Which statement correctly identifies the scientific question and describes why the question is scientific?

The Florida Everglades are one of the most diverse ecosystems in the United States and are home to many species of birds, reptiles, amphibians, and fish. Recently, scientists have investigated and determined that the population of pythons, which are from Asia, has increased greatly. What question is least likely to be asked based on these results?

Why have improvements in microscopes over time resulted in revisions in the cell theory?

Take a look at the statement below:Fish meal is better than artificial fertilizers.How could this statement be revised to make it a hypothesis?

A scientist agrees with the scientific consensus that dinosaurs had scaly skin. Then he discovers a new fossil that indicates a dinosaur had feathers. The scientist refuses to consider the new evidence because it does not agree with the accepted ideas. The scientist is

The independent variable is the only factor that a scientist

Living plants may be valuable additions to science classrooms. Which is the most important safety consideration when planning to grow plants in a classroom?

A student conducted an experiment to test whether talking to plants would help them to grow faster. He set up the following two groups:Group 1: spoken to and hand watered Group 2: not spoken to and watered with sprinklers After three weeks, the plants in Group 1 showed much more growth than those in Group 2. Based on the results of this experiment, which is the best conclusion?

An experiment is performed to test the effect of three different types of water on the growth of a plant. The test is done by using tap water, distilled water, and carbonated water. Choose the statement below that describes the tap water in this experiment.

What would most likely be included in the “Analysis” section of a lab report?

Which equipment is best to hold and to measure liquids?

Density is mass per unit of volume. Which pair of lab instruments would a student use to measure the density of seawater?

A biology class is studying the effect of temperature on the amount of growth of duckweed in an aquarium. What type of data will the class need to collect, and which tools will most likely be used?

Studying the folding patterns of protein molecules can help microbiologists better understand cellular processes as well as some diseases, such as Alzheimer’s, that are caused by proteins that have misfolded. The folding of these complicated molecules can be simulated on computers, but it takes a lot of processor power and time for even expensive supercomputers to do this. A group of researchers at Stanford University developed software that can be used to distribute the processing of data to anyone who is willing to donate time on their idle personal computers. As a result, the researchers have been able to achieve protein-folding simulations that are far better than those other computing methods have done. Which statement best describes the work of these researchers?