Practice Science TEAS Test

Correct Answer: B

Rationale: The correct order of the layers of the epidermis from most superficial to deepest is: S. corneum, S. lucidum, S. granulosum, S. spinosum, S. basale (Choice B). This is because the outermost layer is the stratum corneum, followed by the stratum lucidum, then the stratum granulosum, stratum spinosum, and finally the stratum basale which is the deepest layer where new skin cells are produced. Choices A, C, and D do not follow this correct progression and therefore are incorrect.

Correct Answer: B

Rationale: The correct answer is B: Retina. The retina is a layer of light-sensitive cells located at the back of the eye that detects light and converts it into signals for the brain through the optic nerve. The iris (A) controls the amount of light entering the eye, the lens (C) helps to focus light onto the retina, and the pupil (D) regulates the amount of light entering the eye, but they do not convert light into signals for the brain like the retina does.

Correct Answer: C

Rationale: The correct answer is C because DNA is indeed read 5' to 3', not 3' to 5'. This directionality is essential for DNA replication and protein synthesis. Choice A is correct as DNA contains A, T, C, G nucleotides and is read 5' to 3'. Choice B is correct as DNA carries genetic information and forms chromosomes with proteins. Choice D is correct as DNA is double-stranded with hydrogen bonds holding the two strands together.

Correct Answer: B

Rationale: The correct answer is B: Red blood cell. Red blood cells contain hemoglobin, a protein that binds to oxygen in the lungs and carries it to tissues throughout the body. White blood cells (A) are responsible for fighting infections, platelets (C) help with blood clotting, and plasma (D) is the liquid component of blood that carries nutrients and waste products. Thus, red blood cells are the only cells specifically designed to transport oxygen, making them the correct choice.

Correct Answer: B

Rationale: The correct answer is B: To provide structural support. The skeletal system functions to support the body, protect internal organs, allow movement, and produce blood cells. Structural support is a primary function as bones form the framework of the body. Red blood cell production occurs in the bone marrow, not the skeletal system directly (A). Nutrient transport primarily involves the circulatory system, not the skeletal system (C). Fat storage is not a function of the skeletal system; it is mainly stored in adipose tissue (D). In summary, the skeletal system's main function is to provide structural support for the body.