USABO Open Exam 2024 Questions And Answers VERIFIED

Why is myelin important in the nervous system? A. It allows signals to travel faster along axons because depolarization occurs only at myelinated locations. B. It allows signals to travel faster along axons because depolarization occurs only at nonmyelinated locations. C. It bundles the dendrites of adjacent neurons together. D. It increases capacitance across the cell membrane, which helps electrical signals to leave the axons. E. It traps neurotransmitters, increasing their concentrations in the synaptic cleft. - B Which type of cytoskeletal fiber is the primary building block of eukaryotic cilia and flagella? A. Actin microfilaments. B. Intermediate filaments. C. Keratin. D. Microtubules. E. RNA. - D. Microtubules. Which of the following human cell types contains the LEAST amount of RNA involved in splicing? A. Lymphocytes B. Lymphoblasts C. Erythrocytes D. Erythroblasts E. Hepatocytes - C. Erythrocytes