ATI TEAS SCIENCE Review Questions and Answers 2023

Which element has the smallest atomic radius? A. C B. Ge C. Sn D. Si - A Which of the following is correct regarding the pH scale? a. A substance with a pH 3 is 10 times as acidic as a substance with a pH of 4 b. A substance with a pH 3 is twice as alkaline as a substance with a pH of 4 c. A substance with a pH 3 is 10 times as alkaline as a substance with a pH of 4 d. A substance with a pH 3 is twice as acidic as a substance with a pH of 4 - A Which of the following types of cell stimulates other immune cells to attack and destroy foreign agents? A. Plasma cells B. Cytotoxic T- cell C. Helper T- cell D. Natural killer cells - C When the helper T-cells are activated, they stimulate other WBC such as cytotoxic T cells and B cells Which of the following distinguishes endocrine and exocrine glands from one another? a. the biochemistry of their secretions b. the effect their secretions have on the target cells c. the presence or absence of ducts d. the presence of absence of nerve innervation - C What is the role of the myelin sheath in the nervous system? A: Store ions for action potential propagation B: Transport organelles and macromolecules C: Produce nuerotransmitters D: Insulate axons - D Which of the following neurons signals muscles to contract? A. efferent neuron B. afferent neuron C. interneurons D. efferent and afferent neuron - A