ATI TEAS 7
Practice Science TEAS Test
1. Which structure in the skin is responsible for producing hair?
- A. Sudoriferous gland
- B. Sebaceous gland
- C. Melanocyte
- D. Hair follicle
Correct answer: D
Rationale: The correct answer is D: Hair follicle. Hair follicles are structures in the skin responsible for producing hair. They are specialized structures that contain the hair root and the bulb, where hair growth originates. Sudoriferous glands produce sweat, sebaceous glands produce sebum, and melanocytes are responsible for producing melanin, the pigment that gives hair and skin their color. Choices A, B, and C are incorrect because sudoriferous glands produce sweat, sebaceous glands produce sebum, and melanocytes produce melanin, respectively, but they are not responsible for producing hair.
2. Water is considered a universal solvent due to its ____.
- A. Cohesion
- B. Adhesion
- C. Molarity
- D. Dilution
Correct answer: B
Rationale: The correct answer is B: Adhesion. Water's polarity allows it to dissolve many substances due to its ability to adhere to and interact with other molecules, making it an effective solvent. Cohesion refers to water molecules sticking together, molarity is a measure of concentration, and dilution refers to the process of reducing the concentration of a solute in a solution, none of which directly relate to water's role as a universal solvent.
3. Which of the following statements is NOT true about DNA?
- A. DNA contains the nucleotides A, T, C, G and is read 5' to 3'.
- B. DNA contains genetic information and is tightly coiled with proteins to form chromosomes.
- C. DNA contains the nucleotides A, T, C, G and is read 3' to 5'.
- D. DNA is a double-stranded molecule connected by hydrogen bonds.
Correct answer: C
Rationale: The correct answer is C because DNA is typically read from the 5' end to the 3' end, not from 3' to 5'. Choices A, B, and D are all true statements about DNA. DNA contains the nucleotides A, T, C, G and is read in a 5' to 3' direction. DNA also contains genetic information and is tightly coiled with proteins to form chromosomes. Additionally, DNA is a double-stranded molecule connected by hydrogen bonds.
4. An uncharged atom has an electron configuration of 1s2 2s2 2p6 3s2 and a mass number of 14. How many protons does it have?
- A. 14
- B. 6
- C. 8
- D. 12
Correct answer: B
Rationale: The correct answer is B (6 protons). The electron configuration provided corresponds to the element carbon, which has 6 protons. The mass number does not affect the number of protons in an atom, so despite the mass number of 14, the atom still contains 6 protons. Choice A (14) is incorrect because the mass number does not determine the number of protons. Choices C (8) and D (12) are incorrect as they do not match the number of protons in a carbon atom.
5. What is the independent variable in this experiment?
- A. Time
- B. Dog weight
- C. Dog species
- D. Dog food type
Correct answer: D
Rationale: The independent variable is the factor that is manipulated by the researcher to observe its effects on the dependent variable. In this experiment, the researcher is likely changing the type of dog food, and this manipulation is what impacts the outcome being measured. Therefore, 'Dog food type' is the independent variable. Choices A, B, and C do not represent the variable being intentionally changed by the researcher, making them dependent variables or other factors not directly controlled or manipulated in this experiment.
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