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: B

Rationale: The correct answer is B: Serotonin. Serotonin is associated with feelings of happiness and well-being because it helps regulate mood, emotions, and sleep. Low levels of serotonin have been linked to depression and anxiety. Dopamine (A) is associated with pleasure and reward, GABA (C) is an inhibitory neurotransmitter that helps reduce anxiety, and Acetylcholine (D) is involved in muscle movement and memory. Serotonin is the most relevant neurotransmitter for happiness and well-being due to its specific role in regulating mood and emotions.

Correct Answer: B

Rationale: The correct answer is B: Glycolysis. Glycolysis is the process where glucose is broken down into pyruvic acid through a series of enzymatic reactions in the cytoplasm. This process involves multiple steps including phosphorylation, isomerization, cleavage, and oxidation. Glycogenesis (choice A) is the synthesis of glycogen from glucose, not the breakdown. Glycogenolysis (choice C) is the breakdown of glycogen into glucose, not the conversion of glucose to pyruvic acid. Gluconeogenesis (choice D) is the synthesis of glucose from non-carbohydrate precursors, not the conversion of glucose to pyruvic acid.

Correct Answer: B

Rationale: The correct answer is B: Glucose. Glucose is a monosaccharide because it is a single sugar molecule, the simplest form of carbohydrates. Starch (A) is a polysaccharide made up of multiple glucose units. Cellulose (C) is also a polysaccharide, not a monosaccharide. Sucrose (D) is a disaccharide composed of glucose and fructose molecules. So, only glucose (B) fits the definition of a monosaccharide in this question.

Correct Answer: B

Rationale: The correct answer is B: Elbow joint. A hinge joint allows movement in one direction, similar to a door hinge. The elbow joint only allows flexion and extension, making it a classic example of a hinge joint. The hip joint (A) and shoulder joint (C) are examples of ball-and-socket joints, allowing a wider range of motion in multiple directions. The knee joint (D) is a modified hinge joint, allowing flexion and extension as well as slight rotation, but it is not a typical hinge joint due to its additional movements.