Practice TEAS Science Test

Correct Answer: B

Rationale: The correct answer is B: To fight infection. White blood cells are a vital part of the immune system and are responsible for identifying and destroying pathogens like bacteria and viruses. They play a crucial role in defending the body against infections. A: White blood cells do not transport oxygen. That is the role of red blood cells. C: Red blood cells, not white blood cells, carry oxygen throughout the body. D: While white blood cells can produce antibodies as part of the immune response, their primary function is to directly combat infections.

Correct Answer: D

Rationale: The correct answer is D: Glucose. Glucose is a monosaccharide, not a biological macromolecule. Biological macromolecules are large molecules made up of smaller subunits. Glycoproteins are proteins with attached carbohydrates, DNA is a nucleic acid, and phospholipids are lipids. Glucose, being a simple sugar, is not considered a macromolecule.

Correct Answer: B

Rationale: The correct answer is B: Nucleus. The nucleus is responsible for storing genetic material in the form of DNA. It is surrounded by a nuclear membrane that helps protect and regulate the flow of genetic information. Mitochondria (A) are responsible for energy production, ribosomes (C) are involved in protein synthesis, and the endoplasmic reticulum (D) is involved in protein and lipid synthesis. Therefore, the nucleus is the organelle specifically designed for storing genetic material, making it the correct answer in this case.

Correct Answer: C

Rationale: The correct answer is C: Graduated cylinder. To measure the volume of a solid accurately, we need to use a container with volume markings like a graduated cylinder. Step 1: Fill the graduated cylinder with a known amount of water. Step 2: Drop the solid into the water and measure the new water level. Step 3: Subtract the initial water level from the final level to find the volume displaced, which is the volume of the solid. The other choices are incorrect because a triple beam balance measures mass, a measuring wheel is for linear measurements, and using a measuring wheel and formula may not provide accurate volume measurements.

Correct Answer: A

Rationale: Insulin is the correct answer as it helps regulate blood sugar levels by facilitating the uptake of glucose into cells. Adrenaline, cortisol, and melatonin do not directly regulate blood sugar levels like insulin does. Adrenaline primarily affects the fight-or-flight response, cortisol is involved in stress response and metabolism, and melatonin regulates sleep-wake cycles. Insulin's role in blood sugar regulation is crucial for maintaining proper glucose levels in the body.