TEAS Science Practice Test #3

Question 1

A scientist found that when an invasive species was introduced into a river, the population of salmon native to the region decreased. The type of correlation between these two populations could best be described as

Accepted Answer

an inverse relationship.

Answer

An inverse relationship (also known as a negative correlation) describes a situation where two variables move in opposite directions. In this case, the introduction and likely increase of an invasive species led to a decrease in the native salmon population. This indicates that as one population increased, the other declined, demonstrating an inverse correlation between their numbers.

Question 2

The addition of a catalyst to a chemical reaction will have what effect?

Accepted Answer

Increase the rate at which the reaction takes place.

Answer

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It achieves this by providing an alternative reaction pathway that has a lower activation energy. By lowering the energy barrier, more reactant molecules can overcome it and form products more quickly, thereby accelerating the overall reaction rate.

Question 3

The pharynx is part of what body system?

Accepted Answer

respiratory

Answer

The pharynx is a muscular tube located behind the nose and mouth, connecting them to the esophagus and larynx. It serves as a common passageway for both air and food. Its primary role in conducting air to the larynx and lungs makes it an integral part of the respiratory system.

Question 4

Which of the following is true about eukaryotic cells?

Accepted Answer

They contain mitochondria.

Answer

Eukaryotic cells are characterized by the presence of membrane-bound organelles, which include mitochondria. Mitochondria are crucial for cellular respiration, the process that generates ATP (energy) for the cell. This organelle is a defining feature that distinguishes eukaryotic cells from prokaryotic cells.

Question 5

What characteristic of an element determines its specific isotope?

Accepted Answer

Number of neutrons.

Answer

The atomic number, which is determined by the number of protons, defines an element's identity. Isotopes of an element have the same number of protons but differ in their number of neutrons. Therefore, the number of neutrons determines the specific isotope of an element, affecting its atomic mass but not its chemical properties.

TEAS Practice Test

TEAS Practice Test

TEAS Science Practice Test #3