Practice Science TEAS Test

Correct Answer: B

Rationale: Cytokinesis refers to the division of the cytoplasm during cell division, specifically following the separation of chromosomes. This process results in two daughter cells being formed. The correct answer is B because it accurately describes the final step in cell division where the cytoplasm is divided to complete the formation of two separate daughter cells. Choices A, C, and D are incorrect as they do not specifically pertain to the process of cytokinesis. Choice A refers to the division of the nucleus, which is known as mitosis. Choice C refers to the separation of chromosomes, which is part of the earlier stages of cell division. Choice D refers to the formation of spindle fibers, which are involved in chromosome movement during mitosis but not directly related to cytokinesis.

Correct Answer: B

Rationale: The correct answer is B: Cartilage. Cartilage is the type of tissue that protects the respiratory system's trachea. Cartilage provides structural support and flexibility to the trachea, allowing it to maintain its shape and prevent collapse during breathing. Bone (A) is too rigid for this function. Collagen (C) is a protein that provides strength but does not have the same supportive properties as cartilage. Keratin (D) is a protein found in skin, hair, and nails, not in the trachea. Therefore, cartilage is the most suitable tissue to protect the trachea in the respiratory system.

Correct Answer: C

Rationale: The correct answer is C: Near to the midline of the body. "Medial" refers to being close to the midline of the body or a structure. This term is commonly used in anatomy to describe the position of a body part relative to the midline. Choice A is incorrect as "being face down" is described as prone. Choice B is incorrect as "on the front of the body or limb" is described as anterior. Choice D is incorrect as "above or on top of the lungs" is described as superior. In summary, the term medial specifically refers to proximity to the midline of the body, distinguishing it from the other choices provided.

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: 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.