ATI TEAS Practice Science Test

Correct Answer: B

Rationale: The correct answer is B: Ribcage. The ribcage is a bony structure that surrounds and protects the lungs. It consists of ribs, sternum, and thoracic vertebrae, forming a protective cage around the vital organs in the thoracic cavity. The ribs provide a barrier against external forces and help maintain the shape and integrity of the lungs. The other choices are incorrect because the femur is a bone in the leg, the scapula is a bone in the shoulder, and the skull protects the brain, not the lungs.

Correct Answer: B

Rationale: The correct answer is B: Smallpox. Smallpox was eradicated through a global vaccination campaign led by the World Health Organization. This disease was declared eradicated in 1980 due to the success of mass vaccination programs. AIDS (A) is caused by the human immunodeficiency virus (HIV) and does not have a vaccine. Diabetes type 1 (C) and rheumatoid arthritis (D) are chronic conditions that cannot be eliminated through vaccination programs.

Correct Answer: B

Rationale: The correct answer is B: The plant left outside in normal conditions serves as the control of the experiment. This is because the control group in an experiment remains unchanged and is used as a baseline for comparison. In this case, the plant left outside in normal conditions is the control as it is not subjected to any experimental manipulation, unlike the other tropical plants in the greenhouse. By comparing the growth of the plants in the greenhouse to the plant left outside, any changes in plant height can be attributed to the varying humidity levels, thus allowing for a valid comparison. Choice A is incorrect because plant height for each tropical plant is the experimental variable being measured, not the control. Choice C is incorrect as humidity level readings in the greenhouse are part of the experimental conditions, not the control. Choice D is incorrect because the amount of time used to study plant height is not the control of the experiment; it is the duration of the study.

Correct Answer: A

Rationale: The hypodermis is primarily composed of adipose tissue, which is a type of connective tissue. Adipose tissue serves as a layer of insulation and energy storage in the body. It helps regulate body temperature and provides cushioning for organs. Adipose tissue is the main component of the hypodermis, making choice A the correct answer. Choices B, C, and D are incorrect because the hypodermis is not primarily composed of regular connective tissue, epithelial tissue, or muscle tissue.

Correct Answer: C

Rationale: To calculate the mass of the atom, we add the number of protons and neutrons since electrons have negligible mass. In this case, 17 protons + 20 neutrons = 37. Therefore, the correct answer is C. Choice A is incorrect because it only considers the number of protons. Choice B is incorrect because it only considers the number of neutrons. Choice D is incorrect because it does not take into account the total number of protons and neutrons in the atom.