TEAS Practice Test Science

Correct Answer: B

Rationale: The correct answer is B: Fibrous. Fibrous joints connect bones of the skull with fibrous tissue, providing stability and limited movement. Synovial joints (Choice A) have a joint cavity with synovial fluid for movement but aren't found in the skull. Cartilaginous joints (Choice C) connect bones with cartilage and allow slight movement, not commonly found in the skull. Ball-and-socket joints (Choice D) allow the widest range of motion and are not present in the skull. Therefore, the fibrous joint is the most suitable type for connecting the bones of the skull.

Correct Answer: B

Rationale: The correct answer is B: Meiosis Prophase I. Crossing over occurs during Prophase I of meiosis, specifically during the substage called pachytene. This is when homologous chromosomes pair up and exchange genetic material. This process creates genetic diversity among offspring. Choice A, Mitosis Prophase, is incorrect because crossing over does not occur during mitosis, as homologous chromosomes do not pair up in mitosis. Choice C, Meiosis Prophase II, is incorrect because crossing over only occurs during Prophase I, not Prophase II. Choice D, Interphase, is incorrect because crossing over does not occur during interphase, as it is a phase where the cell prepares for division and DNA replication occurs.

Correct Answer: A

Rationale: The correct answer is A: Femur. Long bones are characterized by their elongated shape, with the length exceeding the width. The femur, as the thigh bone, perfectly fits this description. It serves as a major weight-bearing bone and plays a crucial role in movement and support. Ribs and cranial bones (Choice B) belong to the category of flat bones. Sesamoid bones (Choice C) are small bones embedded within tendons. Vertebrae and hip bones (Choice D) are classified as irregular bones due to their complex shapes and structures.

Correct Answer: B

Rationale: The correct answer is B: Dendrite. Dendrites are the part of the neuron that receives signals from other neurons, allowing for communication between neurons. They contain receptors that bind to neurotransmitters released by neighboring neurons. The axon (A) is responsible for transmitting signals away from the cell body. The synapse (C) is the junction between two neurons where neurotransmitters are released. The myelin sheath (D) is a protective covering that insulates the axon and speeds up signal transmission but does not receive signals from other neurons.

Correct Answer: B

Rationale: The correct answer is B: Pancreas. The pancreas is responsible for producing insulin because it contains clusters of cells called islets of Langerhans, specifically beta cells, which secrete insulin. The liver (A) plays a role in regulating blood sugar levels but does not produce insulin. The gallbladder (C) stores bile and aids in digestion, not insulin production. The spleen (D) is important for immune function but does not produce insulin. Therefore, the pancreas is the correct choice for producing insulin.