ATI TEAS Science

Correct Answer: A

Rationale: To represent 8,600,000,000,000 in scientific notation with two significant figures, we need to move the decimal point to have one non-zero digit before it. Step 1: Write the number in scientific notation: 8.6 x 10^12 Step 2: Check the significant figures: 8.6 has two significant figures. Step 3: Ensure the exponent matches the number of zeros in the original number. Rationale: Choice A is correct as it follows the rules for converting a number to scientific notation with two significant figures. Choices B, C, and D are incorrect because they do not correctly represent the original number in scientific notation with two significant figures. Choice B has the incorrect sign for the exponent, choice C has the incorrect exponent value, and choice D has an unnecessary zero after the decimal point.

Correct Answer: A

Rationale: The correct answer is A because all types of muscle tissue share the properties of being contractile (ability to contract), excitable (responsive to stimuli), elastic (ability to return to original shape), and extensible (ability to stretch). Choice B is incorrect because voluntary is not a shared property of all muscle tissues. Choice C is incorrect because voluntary is not a shared property of all muscle tissues. Choice D is incorrect because voluntary is not a shared property of all muscle tissues.

Correct Answer: A

Rationale: The correct answer is A: DNA mutation. An alteration in the normal gene sequence is referred to as a mutation, which can result from changes in the DNA sequence. Mutations can lead to variations in genetic information. Gene migration (B) refers to the movement of genes between populations. Polygenic inheritance (C) involves the contribution of multiple genes to a trait. Incomplete dominance (D) is a genetic pattern where the phenotype of a heterozygous individual is intermediate between the two homozygous phenotypes.

Correct Answer: D

Rationale: The correct answer is D: Arteries. Arteries carry oxygen-rich blood away from the heart to the body tissues. They have thick, muscular walls to withstand the high pressure of blood pumped from the heart. Veins (A) carry oxygen-poor blood back to the heart. Intestines (B) are part of the digestive system, and bronchioles (C) are small air passages in the lungs.

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.