Question

Answers to mod 1 exam (I just took the test)
Which statement best describes a characteristic of a scientific theory?
Supported by a substantial body of evidence observed in nature

Which answer correctly summarizes the essential elements of a scientific theory?
Never become laws; based on strong scientific support; may change based on evidence

Which of the following best explains how a dissecting microscope differs from a compound light microscope?
A compound light microscope has much greater magnification power than a dissecting microscope?

Answer 1

A scientist who is researching marshes observes that marsh grass, Spartina bakeri, grows to different heights at different locations in the marsh. If the scientist wants to find the reason for this difference, what is the correct first step?
Form a research question based on knowledge of the marsh.

Which of the following best describes what causes water molecules to exhibit properties such as cohesive and adhesive behavior?
Water molecules are polar, having partially positive and partially negative ends

Which of the following questions can be answered scientifically?
Can planting cover crops reduce erosion?

Answer 2

Which of the following best describes one way electron microscopes and light microscopes differ in structure?
Electron microscopes use a beam of electrons instead of light to magnify images.

The study of biology is correctly defined as
learning about the interactions and functions of living organisms

Which of the following would most likely be key to gathering evidence that the "RNA World" hypothesis is valid?
Simulation of early Earth conditions and long-term study of the resulting molecules

Which of the following best represents the relationship between the pH of water, vinegar, and ammonia
Answer is A, The pH chart

Christiaan Eijkman shared the Nobel Prize in 1929 for the discovery of vitamins. Eijkman went to Java to isolate the pathogen causing beriberi, an illness that appeared to be contagious as it was common in prisons and among ship crews. Eijkman noticed that chickens fed a diet of white rice also suffered from a similar disorder. When the chickens were fed a diet of red rice, the chickens quickly recovered. Eijkman returned to the Netherlands and persuaded a prison to feed the prisoners red rice, and the incidence of beriberi decreased. What would the next step for Eijkman be?
He can infer that beriberi may be related to diet, but more and better studies are needed.

Review the moth diagram. What can be correctly inferred from the information in the diagram?
Black moths are adapted to their environment better than speckled moths.

For which of the following would a transmission electron microscope be the best type of microscope to use?
Viewing a cell’s mitochondria in detail

During a science fair, a group of students came up with the following question: "Is color an inherent property in objects or is it a product of the mind?" Why would this question be extremely difficult to answer scientifically?
How people experience color varies

Scientists review the work of other scientists to
validate the results and check the evidence's reliability

In which of the following ways is the function of the surface of a microsphere similar to the function of an actual cell membrane?
Both make it possible for the conditions in the interior to be different from the conditions outside.

Answer 3

A scientific study by a pesticide company claims that a new pesticide for spraying tomatoes is both highly effective and safe. The company claims that while pests are killed, the product is entirely safe to humans. At this point, what can a consumer know for certain about the validity of the company's claims?
Additional studies will be the reliability check for the claims.