Practice TEAS Science Test

Correct Answer: C

Rationale: The correct answer is C because not all macromolecules contain phosphorus. Macromolecules such as proteins, carbohydrates, and lipids contain carbon, hydrogen, and oxygen but not necessarily phosphorus. Proteins and carbohydrates can exist as single chains or be branched, so choices A and B are not characteristics that exclude a macromolecule. Choice D is also incorrect because not all macromolecules are used by the body, as some like cellulose are not digestible by humans.

Correct Answer: D

Rationale: The correct answer is D because a positive correlation indicates that as one variable increases, the other variable also increases. In this case, when plotting rainfall against plant length, if the line trends to the upper right, it shows that as rainfall increases, the plant length also increases. This demonstrates a positive correlation. A is incorrect because it describes a negative correlation where an increase in rainfall leads to a decrease in plant stem length. B is incorrect as it suggests a positive correlation between rainfall and roots length. C is incorrect as a line trending to the lower right also indicates a negative correlation between the variables.

Correct Answer: B

Rationale: The correct answer is B: Depolarization of the SA node. The P-wave in an ECG represents atrial depolarization, which is initiated by the SA node. This electrical signal spreads through the atria causing them to contract. Choice A is incorrect because the P-wave corresponds to atrial depolarization, not repolarization. Choice C is incorrect as the QRS complex represents ventricular depolarization. Choice D is incorrect as the T-wave represents ventricular repolarization. Therefore, the SA node depolarization is accurately represented by the P-wave in an ECG.

Correct Answer: B

Rationale: The correct answer is B: ATP energy. Cellular respiration is the process by which cells convert glucose into ATP, the primary energy source for cellular activities. During cellular respiration, glucose is broken down in the presence of oxygen to produce ATP through a series of metabolic reactions. Oxygen (choice A) is required for cellular respiration but is not an end product. Carbon dioxide (choice C) is a byproduct of cellular respiration, not an end product. Water (choice D) is not directly produced as an end product of cellular respiration. Thus, choice B is the correct answer as ATP energy is the main end product generated from cellular respiration.

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.