TEAS 7 Biology: Master Key Concepts

ATI TEAS 7

Biology

1. Which of the following statements about fungi is FALSE?

A. They can be unicellular or multicellular
B. They are all parasitic and cause disease in humans
C. They play a vital role in decomposition and nutrient cycling
D. Some are used in food production, like mushrooms

Correct answer: B

Rationale: Rationale: A) This statement is true. Fungi can exist in both unicellular (yeast) and multicellular (molds and mushrooms) forms. B) This statement is false. While some fungi can be parasitic and cause diseases in humans, not all fungi exhibit this behavior. Many fungi are beneficial and play essential roles in ecosystems. C) This statement is true. Fungi are crucial for decomposition and nutrient cycling in ecosystems. They break down organic matter and recycle nutrients back into the environment. D) This statement is true. Some fungi, like mushrooms, are used in food production and are consumed by humans.

2. Dendrites are finger-like extensions found on

A. Muscle cells
B. Connective tissue cells
C. Neurons
D. Epithelial cells

Correct answer: C

Rationale: Dendrites are the primary sites for receiving signals in a neuron. They are specialized extensions that branch out from the cell body of a neuron to receive incoming information from other neurons. These finger-like projections play a crucial role in transmitting electrical impulses and communication within the nervous system. Muscle cells, connective tissue cells, and epithelial cells do not have dendrites as they are not involved in neuronal communication.

3. A person pushes a box across a floor with a constant force. The box eventually comes to a stop due to friction. What happens to the work done by the person?

A. It increases as the box moves further.
B. It decreases as the box slows down.
C. It remains constant throughout the motion.
D. It becomes zero once the box stops.

Correct answer: C

Rationale: Work is defined as force multiplied by distance, and as long as the force remains constant, the work done increases proportionally to the distance moved, even if the box slows down due to friction.

4. During which phase of the cell cycle does cytokinesis typically occur?

A. Interphase
B. Mitosis
C. Meiosis
D. G2 phase

Correct answer: B

Rationale: Rationale: Cytokinesis is the process of dividing the cytoplasm of a cell into two daughter cells after the nucleus has divided during mitosis. In the cell cycle, cytokinesis typically occurs at the end of the mitotic phase, following the separation of the duplicated chromosomes into two identical sets in the daughter nuclei. Interphase (option A) is the phase where the cell grows, carries out its normal functions, and prepares for cell division. Meiosis (option C) is a specialized type of cell division that occurs in sexually reproducing organisms to produce gametes. G2 phase (option D) is the phase of the cell cycle following DNA replication in S phase and preceding mitosis, where the cell prepares for cell division.

5. Which of the following terms refers to a muscle that lengthens while another muscle contracts to produce movement?

A. Synergist
B. Agonist
C. Antagonist
D. Flexor

Correct answer: C

Rationale: The correct answer is C: Antagonist. In muscle physiology, an antagonist refers to a muscle that lengthens while another muscle contracts to produce movement. This relationship allows for smooth and coordinated movement by controlling the action of the agonist muscle. For example, when you bend your arm, the biceps muscle (agonist) contracts to flex the arm while the triceps muscle (antagonist) lengthens to allow for this movement. Synergists assist the agonist muscle in performing a movement, while flexors are a type of muscle that decreases the angle between bones at a joint. Therefore, the antagonist best fits the description of a muscle that lengthens while another muscle contracts.