ati teas 7 science

ati teas 7 science Related

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The fossil record shows that dinosaurs with feathers existed millions of years before birds. This is evidence for

  • A. Convergent evolution (unrelated organisms evolving similar traits)
  • B. Divergent evolution (related organisms evolving different traits)
  • C. Coevolution (two species influencing each other's evolution)
  • D. The extinction of dinosaurs due to an asteroid impact
Correct Answer: A

Rationale: The fossil record indicates that dinosaurs had feathers before birds, suggesting convergent evolution. Convergent evolution occurs when unrelated organisms independently evolve similar traits to adapt to similar environmental pressures. In this case, both dinosaurs and birds developed feathers for flight or insulation purposes, even though they are not closely related. This evidence supports the concept of convergent evolution rather than divergent evolution, coevolution, or the extinction of dinosaurs due to an asteroid impact. Therefore, the correct answer is A, as it best explains the scenario where dinosaurs with feathers existed before birds, showcasing the concept of unrelated organisms evolving similar traits independently.

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Which structure in the body is responsible for producing testosterone?

  • A. Adrenal glands
  • B. Pituitary gland
  • C. Testes
  • D. Pancreas
Correct Answer: C

Rationale: The correct answer is C: Testes. The testes are responsible for producing testosterone, the hormone that plays a crucial role in male secondary sexual characteristics such as facial hair, deepening of the voice, and muscle development. The adrenal glands primarily produce cortisol and aldosterone, not testosterone. The pituitary gland regulates hormone production in various glands, including the testes, but it does not directly produce testosterone. The pancreas is responsible for producing insulin and glucagon to regulate blood sugar levels, not testosterone.

Which of the following vessels is responsible for pumping oxygenated blood to the body?

  • A. Right ventricle
  • B. Left ventricle
  • C. Pulmonary artery
  • D. Aorta
Correct Answer: D

Rationale: The aorta is the correct answer because it is responsible for pumping oxygenated blood from the heart to the rest of the body. The aorta is the main artery that carries blood away from the heart and distributes it to all parts of the body, providing oxygen and nutrients to the tissues. Choices A, B, and C are incorrect. The right ventricle pumps deoxygenated blood to the lungs through the pulmonary artery, the left ventricle pumps oxygenated blood to the body through the aorta, and the pulmonary artery carries deoxygenated blood from the heart to the lungs for oxygenation.

What is the unit of measurement for density?

  • A. Grams per liter (g/L)
  • B. Kilograms per cubic meter (kg/m³)
  • C. Pounds per square inch (psi)
  • D. Newtons per meter (N/m)
Correct Answer: A

Rationale: Density is defined as mass per unit volume. The most commonly used unit for density in the metric system is grams per liter (g/L). Kilograms per cubic meter (kg/m³) is also a common unit for density, but grams per liter is more frequently used in everyday measurements. Pounds per square inch (psi) is a unit of pressure, not density. Newtons per meter (N/m) is a unit of force per unit length, not density.

Which type of muscle is found in the heart?

  • A. Smooth muscle
  • B. Cardiac muscle
  • C. Skeletal muscle
  • D. Voluntary muscle
Correct Answer: B

Rationale: The correct answer is 'B: Cardiac muscle.' Cardiac muscle is the specific type of muscle found in the heart. Unlike smooth muscle and skeletal muscle, cardiac muscle is involuntary and contracts rhythmically to pump blood throughout the body, making it essential for the heart's function. Smooth muscle (Choice A) is found in the walls of hollow organs and blood vessels, while skeletal muscle (Choice C) is attached to bones and responsible for movement. Voluntary muscle (Choice D) is another term for skeletal muscle, which is under conscious control.

Which organelle is responsible for controlling the activities of the cell?

  • A. Golgi apparatus
  • B. Mitochondria
  • C. Nucleus
  • D. Ribosomes
Correct Answer: C

Rationale: The nucleus is the organelle responsible for controlling the activities of the cell. It contains the cell's genetic material (DNA) and serves as the command center of the cell, regulating gene expression and directing cellular activities. The nucleus plays a crucial role in cell growth, metabolism, and reproduction. While the Golgi apparatus is involved in processing and packaging proteins, the mitochondria are responsible for producing energy in the form of ATP, and ribosomes are involved in protein synthesis, none of these organelles have the primary function of controlling the activities of the cell like the nucleus does. Therefore, the correct answer is the nucleus.

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