ATI TEAS Practice Science Test

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: 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: D

Rationale: The correct answer is D: Bottom of the uterus. The cervix is the lower narrow end of the uterus that connects to the top of the vagina. It serves as a passage for menstrual blood to exit the body and for sperm to enter the uterus. The other choices are incorrect because the cervix is not located at the top of the uterus (A), top of the ovaries (B), or bottom of the vagina (C). Understanding the anatomical structure and function of the female reproductive system is key to selecting the correct answer.

Correct Answer: A

Rationale: The correct answer is A: Diffusion. Gas exchange in the respiratory system occurs through diffusion, where oxygen moves from the alveoli in the lungs to the blood and carbon dioxide moves from the blood to the alveoli. This process is driven by a concentration gradient, allowing for the exchange of gases between the air and blood. Exhalation (choice B) is the process of expelling air from the lungs, not the mechanism of gas exchange. Inspiration (choice C) is the process of inhaling air into the lungs, but it is not directly involved in gas exchange. Ventilation (choice D) refers to the movement of air into and out of the lungs and is necessary for gas exchange to occur but is not the actual mechanism of gas exchange itself.

Correct Answer: D

Rationale: The correct answer is D: Oxygen. 1. Oxygen has 8 electrons in total, with 2 in the first shell and 6 in the second shell, following the 2-8-8 electron configuration rule. 2. Beryllium has 4 electrons with 2 in the first shell and 2 in the second shell. 3. Carbon has 6 electrons with 2 in the first shell and 4 in the second shell. 4. Helium has 2 electrons, filling the first shell. Therefore, Oxygen is the only element among the choices that fits the description of having 2 electrons in the first shell and 6 electrons in the second shell.