ati teas 7 science

Correct Answer: B

Rationale: The correct answer is B: Cytoplasm. Cytoplasm is the fluid-filled, jelly-like substance within the cell that suspends the organelles. It is where many cellular processes occur. The nucleus (A) contains genetic material, not the organelles. The plasma membrane (C) is the cell's outer boundary, not the internal fluid. The Golgi apparatus (D) is an organelle involved in processing and packaging proteins, not the cell's fluid. Therefore, the correct answer is cytoplasm.

Correct Answer: D

Rationale: The correct answer is D because muscle tissue is indeed involved in all the functions listed. Muscles generate body heat through metabolism, stabilize joints by providing support and movement, and help maintain posture by keeping the body in an upright position. Therefore, muscle tissue plays a crucial role in all these functions. Choices A, B, and C are incorrect individually as they only represent a part of the functions that muscle tissue is involved in, whereas the correct answer encompasses all aspects of muscle function in the body.

Correct Answer: A

Rationale: The main function of lysosomes is to break down and recycle cellular waste through the process of autophagy. Lysosomes contain enzymes that break down various molecules, organelles, and pathogens. This process helps maintain cellular homeostasis and provides the cell with raw materials for new cell components. Storing carbohydrates (B) is incorrect as lysosomes do not function in this capacity. Synthesizing lipids (C) is incorrect as this is typically the role of the endoplasmic reticulum and Golgi apparatus. Transcribing DNA into mRNA (D) is incorrect as this process occurs in the nucleus by RNA polymerase.

Correct Answer: A

Rationale: The primary function of the coronary arteries is to carry oxygenated blood to the heart muscle. This is essential for providing the heart muscle with the oxygen and nutrients it needs to function properly. Without adequate oxygen supply, the heart muscle can become damaged, leading to conditions like heart attacks. The other choices are incorrect because: B: Coronary arteries do not carry deoxygenated blood from the heart muscle; they supply oxygenated blood to it. C: Pumping blood to the lungs for oxygenation is the function of the pulmonary arteries, not the coronary arteries. D: Regulating blood pressure in the systemic circulation is primarily the function of the arteries and arterioles throughout the body, not specifically the coronary arteries.

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.