ATI TEAS 7
Practice Science TEAS Test
1. What does cytokinesis refer to?
- A. Division of the nucleus
- B. Division of the cytoplasm
- C. Separation of chromosomes
- D. Formation of spindle fibers
Correct answer: B
Rationale: Cytokinesis refers to the division of the cytoplasm of a parental cell between two daughter cells during cell division. It ensures that each daughter cell receives its share of organelles and cytoplasmic components necessary for cellular functions. Choice A, division of the nucleus, is incorrect as this process is known as mitosis. Choice C, separation of chromosomes, is incorrect as it refers to the process of chromatid separation during mitosis. Choice D, formation of spindle fibers, is incorrect as spindle fibers are involved in mitosis to separate chromosomes, not in cytokinesis.
2. Which part of the digestive system is responsible for absorbing nutrients?
- A. Esophagus
- B. Stomach
- C. Small intestine
- D. Large intestine
Correct answer: C
Rationale: The small intestine is the correct answer because it is the primary site for nutrient absorption in the digestive system. It contains specialized structures such as villi and microvilli that maximize the absorption of nutrients from digested food. The esophagus is responsible for transporting food from the mouth to the stomach; the stomach primarily aids in digestion by secreting enzymes and acids; and the large intestine mainly absorbs water and electrolytes from the remaining indigestible food matter. Therefore, the small intestine plays a crucial role in absorbing essential nutrients for the body's functions, making it the correct choice in this context.
3. Which of the following organs is responsible for producing digestive enzymes?
- A. Liver
- B. Pancreas
- C. Gallbladder
- D. Esophagus
Correct answer: B
Rationale: The correct answer is the Pancreas. The pancreas is an organ that produces digestive enzymes to aid in the breakdown of food in the small intestine. These enzymes play a crucial role in the digestion and absorption of nutrients from the food we eat. The liver is responsible for producing bile, not digestive enzymes. The gallbladder stores and concentrates bile produced by the liver, which aids in the digestion of fats. The esophagus is a muscular tube that helps in the movement of food from the mouth to the stomach and does not produce digestive enzymes.
4. How many neutrons and electrons could a negative ion of sulfur have?
- A. 16 neutrons, 16 electrons
- B. 16 neutrons, 17 electrons
- C. 17 neutrons, 16 electrons
- D. 17 neutrons, 17 electrons
Correct answer: B
Rationale: A negative ion of sulfur would have 16 protons and 17 electrons since it gains one electron. The number of neutrons in an ion does not change, so the neutrons would remain at 16. Therefore, the correct answer is 16 neutrons and 17 electrons, which corresponds to choice B. Choice A is incorrect as it does not account for the extra electron gained by the negative ion. Choices C and D are incorrect because they propose a change in the number of neutrons, which is not affected by the ionization process.
5. Which hormone is released by the pituitary gland?
- A. Estrogen
- B. Luteinizing Hormone
- C. Progesterone
- D. Testosterone
Correct answer: B
Rationale: The correct answer is B: Luteinizing Hormone. The pituitary gland releases luteinizing hormone, which plays a crucial role in reproductive functions by stimulating ovulation in females and testosterone production in males. Choice A, Estrogen, is incorrect as estrogen is mainly produced by the ovaries. Choice C, Progesterone, is incorrect as progesterone is produced by the corpus luteum in the ovaries and the placenta during pregnancy. Choice D, Testosterone, is incorrect as testosterone is produced primarily in the testes in males and in smaller amounts in the ovaries and adrenal glands in females.
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