ATI TEAS Science

Correct Answer: D

Rationale: The correct answer is D: Gametes. Meiosis is a type of cell division that produces gametes (sperm and egg cells) with half the number of chromosomes as the parent cell. Genes (A) are units of heredity, alleles (B) are different forms of a gene, and chromatids (C) are duplicated chromosomes. These choices are not directly produced by meiosis but are related to genetic material and cell division processes. Gametes are the specific reproductive cells formed through meiosis, making them the correct answer.

Correct Answer: B

Rationale: The correct answer is B: Secondary structure. Secondary structure is defined by the local folds and coils in the protein's polypeptide backbone, such as alpha helices and beta sheets. This level of structure does not involve interactions between different regions of the protein (tertiary) or multiple protein subunits (quaternary). Primary structure (A) refers to the linear sequence of amino acids. Tertiary structure (C) involves the 3D arrangement of secondary structures and other elements in a single polypeptide chain. Quaternary structure (D) pertains to the arrangement of multiple polypeptide subunits in a protein complex.

Correct Answer: A

Rationale: The correct answer is A: They're both accurate and precise. Rationale: 1. Accuracy: The measurements are close to the accepted value of 9.8 m/s^2, with a range of 9.78-9.81 m/s^2. 2. Precision: The measurements are consistent and clustered closely around the true value, indicating precision. 3. The slight variations in measurements are expected due to experimental error but still fall within an acceptable range. In summary, the measurements are accurate as they are close to the true value, and they are precise as they are clustered closely together. Other choices are incorrect because they do not accurately reflect the situation based on the provided data.

Correct Answer: B

Rationale: The correct answer is B because in an experiment, the independent variable is the one that is manipulated by the researcher, which in this case is the amount of poison given to the rat. The dependent variable is the outcome that is being measured, which is how quickly the rat dies. By varying the amount of poison, we can observe the effect it has on the time it takes for the rat to die. Choices A, C, and D are incorrect because they incorrectly identify the independent and dependent variables or introduce irrelevant variables like whether the rat eats the poison or the cage the rat is kept in, which are not the variables being directly manipulated or measured in this experiment.

Correct Answer: A

Rationale: The correct answer is A: A control. A control in an experiment is used as a standard for comparison because it remains unchanged and is not subjected to the experimental treatment. By comparing the results of the experimental group to the control group, researchers can determine the effectiveness of the treatment. Variables (B) and constants (C) are factors that are manipulated or kept consistent, respectively, in an experiment but do not serve as a standard for comparison. Collected data (D) is the outcome of the experiment and is not used as a standard for comparison.