Practice Science TEAS Test

Correct Answer: B

Rationale: Step 1: Identify the atomic number of the element based on the electron configuration (1s2 2s2 2p6 3s2) which corresponds to oxygen (O) with atomic number 8. Step 2: Determine the number of protons in the nucleus by looking at the mass number which is 14 for this atom. Step 3: Subtract the mass number from the atomic number to find the number of neutrons (14 - 8 = 6). Step 4: Protons + neutrons = mass number, so the number of protons is equal to the atomic number, which is 8. Therefore, choice B is correct. Summary: A: 14 - Incorrect, this would be the total mass number, not the number of protons. B: 6 - Correct, determined by the atomic number of the element. C: 8 - Incorrect, this is the number of protons in oxygen, not the atom described

Correct Answer: B

Rationale: The correct answer is B: Smooth muscles. Smooth muscles are found in the walls of hollow organs like the stomach, intestines, and blood vessels. They are involuntary muscles responsible for the contraction and relaxation of these organs to facilitate processes like digestion and blood flow. Cardiac muscles (choice A) are found in the heart, skeletal muscles (choice C) are attached to bones for movement, and voluntary muscles (choice D) refer to muscles under conscious control, which can be either skeletal or cardiac but not typically found in the walls of hollow organs.

Correct Answer: B

Rationale: The correct answer is B: Small intestine. The small intestine is primarily responsible for absorbing nutrients due to its large surface area and presence of specialized structures like villi and microvilli. These structures increase absorption efficiency. The stomach mainly breaks down food, the esophagus is a passage for food, and the large intestine primarily absorbs water and salts. Thus, the small intestine is the main site for nutrient absorption in the digestive system.

Correct Answer: D

Rationale: The correct answer is D: Hair follicle. The hair follicle is the structure responsible for producing hair. It is located in the dermis and is composed of cells that generate hair growth. The other choices, A: Sudoriferous gland, B: Sebaceous gland, and C: Melanocyte, do not produce hair. Sudoriferous glands produce sweat, sebaceous glands produce oil, and melanocytes produce melanin for skin pigmentation. Therefore, the correct answer is D as it directly relates to hair production.

Correct Answer: A

Rationale: The correct answer is A: Bicarbonate. CO2 is primarily transported in the blood as bicarbonate ions. This process involves carbonic anhydrase converting CO2 into carbonic acid, which then dissociates into bicarbonate and hydrogen ions. Bicarbonate is the main form in which CO2 is transported from tissues to the lungs for elimination. Choice B, carbamino compounds, refers to CO2 bound to amino groups in hemoglobin, but this method is a minor mode of CO2 transport. Choice C, None of these, is incorrect as bicarbonate is indeed the primary mode of CO2 transport. Choice D, Plasma, is incorrect as CO2 is not directly transported in the blood as plasma but rather in the form of bicarbonate ions.