TEAS 7 Science Practice Test

Correct Answer: A

Rationale: The correct answer is A because atomic radius generally increases from top to bottom within a group and decreases from left to right across a period on the periodic table. This trend is due to the increasing number of energy levels (shells) as you move down a group, leading to larger atomic radii. Moving from left to right across a period, atomic radius decreases due to increasing effective nuclear charge pulling the electrons closer to the nucleus. Choices B, C, and D are incorrect as they do not accurately describe the trend of atomic radius across the periodic table.

Correct Answer: A

Rationale: The correct answer is A: smooth endoplasmic reticulum. The smooth endoplasmic reticulum is the site of lipid synthesis due to the presence of enzymes involved in lipid metabolism. It lacks ribosomes, unlike the rough endoplasmic reticulum, which is primarily involved in protein synthesis. The Golgi apparatus functions in processing and packaging proteins for secretion. Ribosomes are involved in protein synthesis, not lipid synthesis. Therefore, the smooth endoplasmic reticulum is the organelle responsible for lipid synthesis.

Correct Answer: C

Rationale: The primary function of the large intestine is to absorb water and compact material into solid waste. This process helps in forming feces for elimination. Absorbing digested material into the blood (Choice A) is mainly done in the small intestine. Nutrient processing and metabolizing (Choice B) occur in various organs like the liver and kidneys, not primarily in the large intestine. Bile production and storage (Choice D) are functions of the liver and gallbladder, not the large intestine.

Correct Answer: A

Rationale: The correct answer is A: calcium. Bone is primarily composed of calcium phosphate, which provides strength and rigidity to the bone structure. Calcium is crucial for bone formation and mineralization. Magnesium and potassium are important for various bodily functions but are not the primary components of bone. Collagen is a protein that provides flexibility and support but is not an inorganic material found in bones.

Correct Answer: C

Rationale: The correct answer is C: synapse. Neurotransmitters are chemicals that transmit signals between neurons. The synapse is the gap between neurons where these chemical messages are transmitted. Schwann cells are responsible for myelinating axons, ganglion is a cluster of nerve cell bodies, and the axon is the part of a neuron that carries the signal away from the cell body. Therefore, the synapse is the structure specifically involved in transmitting neurotransmitters between neurons.