Practice Science TEAS Test

Correct Answer: D

Rationale: The independent variable is the factor that the researcher manipulates or controls. In this experiment, the independent variable is the dog food type as it is being purposely changed to observe its effect on the dependent variable. Time is not manipulated, dog weight and species are not changed intentionally, making them unsuitable as independent variables. The correct answer is D because it is the variable that is being tested and controlled in the experiment.

Correct Answer: A

Rationale: The correct answer is A: B6. Vitamin B6, also known as pyridoxine, is not synthesized in the large intestine. It is primarily absorbed in the small intestine. Biotin, Pantothenic acid, and Vitamin K are all synthesized in the large intestine. Biotin and Pantothenic acid are produced by gut bacteria, while Vitamin K is synthesized by the intestinal flora. Therefore, the correct answer is A because B6 is not synthesized in the large intestine, unlike the other options.

Correct Answer: B

Rationale: Rationale: Sulfur (atomic number 16) typically has 16 protons and 16 electrons in a neutral state. A negative ion gains an electron, so it would have 16 protons, 16 neutrons, and 17 electrons to maintain charge neutrality. Therefore, choice B (16 neutrons, 17 electrons) is correct. Choices A, C, and D are incorrect as they do not account for the addition of an extra electron in the negative ion, resulting in an incorrect number of electrons.

Correct Answer: B

Rationale: The correct answer is B: Hypothalamus. The hypothalamus regulates body temperature, hunger, and thirst through its control of the autonomic nervous system and hormonal systems. It plays a crucial role in maintaining homeostasis. The cerebellum (A) is responsible for coordination and balance, the thalamus (C) acts as a relay station for sensory information, and the medulla oblongata (D) regulates vital functions such as breathing and heart rate, but not body temperature, hunger, or thirst.

Correct Answer: A

Rationale: Estrogen is the correct answer because it is the hormone released by the ovaries to mature an egg. Estrogen plays a crucial role in the development of the ovarian follicle, promoting the growth and maturation of the egg. Luteinizing Hormone and Progesterone are also involved in the menstrual cycle but do not directly mature the egg. Testosterone is primarily produced in the testes and plays a role in male reproductive functions, not in egg maturation.