a researcher is studying the response of bacteria to a certain chemical in three experiments the bacteria swim towards the chemical and in one experim

ATI TEAS 7

Science TEAS Practice Test

1. A researcher is studying the response of bacteria to a certain chemical. In three experiments, the bacteria swim towards the chemical, and in one experiment, the bacteria swim away from it. What would be the most appropriate next step for the researcher?

A. Report only the first three experiments.
B. Report all the experiments, but refrain from making any conclusions.
C. Repeat the experiment several more times and apply a statistical analysis to the data.
D. Repeat the experiment, adding a new chemical to determine its effect on the bacteria.

Correct answer: C

Rationale: Repeating the experiment multiple times and applying statistical analysis would help ensure the results are reliable. By doing so, the researcher can validate the observed trends and determine the significance of the bacteria's response to the chemical. This approach would enhance the credibility of the findings and allow for more robust conclusions to be drawn. Reporting only the first three experiments (Choice A) would overlook critical data that could provide a comprehensive understanding of the bacteria's response. Refraining from making any conclusions (Choice B) would not utilize the available data effectively. Adding a new chemical in a repeated experiment (Choice D) would deviate from focusing on analyzing the response to the original chemical, introducing unnecessary variables.

2. What is the function of fascia in muscle tissue?

A. to enclose, protect, support, and separate muscle tissue
B. to connect muscle tissue to bone
C. to serve as the contractile unit of muscle
D. to slide past the actin protein cells in muscle to create contraction

Correct answer: A

Rationale: The correct answer is A: 'to enclose, protect, support, and separate muscle tissue.' Fascia is a connective tissue that surrounds muscles, providing structural support, protecting them from friction and injury, and helping in movement. Choice B is incorrect as tendons are responsible for connecting muscle tissue to bone. Choice C is incorrect as the contractile unit of muscle is the sarcomere, not fascia. Choice D is incorrect as the process described relates to muscle contraction mechanisms involving actin and myosin, not the function of fascia.

3. What are the primary differences between systemic and pulmonary circulation?

A. Systemic circulation is shorter and has lower blood pressure
B. Pulmonary circulation is shorter and has higher blood pressure
C. Systemic circulation is longer and has higher blood pressure
D. Systemic circulation is shorter but has higher blood pressure

Correct answer: C

Rationale: The correct answer is C. Systemic circulation is longer as it involves carrying oxygenated blood throughout the body, requiring higher blood pressure. Pulmonary circulation is shorter and involves the flow of blood only through the lungs, hence having lower blood pressure. Therefore, systemic circulation is longer and has higher blood pressure compared to pulmonary circulation. Choice A is incorrect as systemic circulation is longer, not shorter, and has higher blood pressure. Choice B is incorrect as pulmonary circulation has lower blood pressure, not higher. Choice D is incorrect as systemic circulation is longer, not shorter, despite having higher blood pressure.

4. What term describes the point where parallel rays of light converge or appear to diverge after passing through a lens or reflecting off a mirror?

A. Aperture
B. Focal length
C. Refractive index
D. Lens thickness

Correct answer: B

Rationale: The correct answer is 'Focal length.' Focal length is the term used to describe the point where parallel rays of light converge or appear to diverge after passing through a lens or reflecting off a mirror. It is a critical parameter in optics that determines the magnification and image formation in optical systems. Aperture refers to the opening through which light enters a camera or telescope, not the convergence point of light rays. Refractive index is a measure of how much light is bent, not the point where rays converge. Lens thickness is the physical dimension of a lens and does not indicate the convergence point of light rays. Therefore, 'Focal length' is the most appropriate choice in this context.

5. What controls the involuntary, rhythmic contractions of the heart muscle?

A. Lungs
B. Brain
C. Spinal cord
D. Sinoatrial node (located within the heart)

Correct answer: D

Rationale: The correct answer is D: Sinoatrial node (located within the heart). The involuntary, rhythmic contractions of the heart muscle are controlled by a specialized group of cells located within the heart called the sinoatrial node (SA node). The SA node acts as the heart's natural pacemaker, producing electrical impulses that regulate the heart rate and synchronize the contractions of the heart muscle. Choices A, B, and C (Lungs, Brain, Spinal cord) are not responsible for directly influencing the rhythmic contractions of the heart muscle.