ati teas 7 science

Correct Answer: B

Rationale: Peristalsis is the correct answer. It is the term for the involuntary muscle contractions that move food through the digestive tract. These contractions help propel food along the digestive system. Segmentation is the process of breaking down food by mixing it with digestive juices. Chyme is the semi-fluid mass of partly digested food in the stomach and intestines. Emulsification is the breakdown of fats into smaller droplets for easier digestion. But none of these terms specifically refer to the muscle contractions that move food through the digestive tract like peristalsis does.

Correct Answer: B

Rationale: The correct answer is B: Protons and neutrons only. Electrons are not found in the nucleus, as they orbit around the nucleus in electron shells. Protons and neutrons are the subatomic particles found within the nucleus of an atom. Protons have a positive charge, while neutrons are neutral. The nucleus contains almost all of the atom's mass and is positively charged due to the presence of protons. Choice A is incorrect because electrons are not part of the nucleus. Choice C is incorrect because electrons are not present in the nucleus. Choice D is incorrect as protons and neutrons are indeed constituents of the atomic nucleus.

Correct Answer: B

Rationale: The correct answer is B: The angle of the incline. The acceleration of a ball rolling down an inclined plane is primarily determined by the angle of the incline. A steeper incline will result in a greater component of the gravitational force acting parallel to the incline, leading to a higher acceleration. The material of the ball (choice A) does not affect the acceleration in this scenario. Air resistance (choice C) may have a small impact but is usually negligible for small objects like balls. The ball's initial velocity (choice D) does not affect the acceleration once the ball is released from rest on the incline.

Correct Answer: D

Rationale: The Golgi apparatus is responsible for modifying, sorting, and packaging proteins and lipids for transport within or outside the cell. It receives proteins from the endoplasmic reticulum for further processing. Option D is correct because it accurately describes the main functions of the Golgi apparatus. Option A is incorrect because the transport of proteins and lipids is primarily carried out by the endoplasmic reticulum. Option B is incorrect as the Golgi apparatus is not primarily for storing water and nutrients. Option C is incorrect because protein synthesis primarily occurs in the ribosomes, not the Golgi apparatus.

Correct Answer: C

Rationale: The correct answer is C: Light energy from the sun. This is because photosynthesis, the process by which plants and other organisms convert light energy into chemical energy, is the primary source of energy in most ecosystems. Sunlight is essential for plants to produce food, which then sustains the entire food chain. Choice A (Chemical energy stored in bonds) is incorrect because this energy is a product of photosynthesis and not the primary source entering ecosystems. Choice B (Thermal energy from the Earth's core) is incorrect as it is not a significant source of energy for most ecosystems. Choice D (Kinetic energy from wind and water) is also incorrect as it is not the primary source of energy entering ecosystems, although it can play a role in some ecosystems.