Consider the following statements about the nervous system: 1. Motor neurons carry impulses from the CNS to effectors. 2. Sensory neurons carry impulses from receptors to the CNS. 3. Interneurons are found only in the peripheral nervous system. Which of the above is/are correct? MCQ with Answer and Explanation
Consider the following statements about the nervous system:
1. Motor neurons carry impulses from the CNS to effectors.
2. Sensory neurons carry impulses from receptors to the CNS.
3. Interneurons are found only in the peripheral nervous system.
Which of the above is/are correct?
A. 1 and 2 only
B. 1, 2, and 3
C. 1 and 3 only
D. 2 and 3 only
Answer: Option A
Solution (By JKSSB Mock Tests)
Motor (efferent) and sensory (afferent) neurons are correctly described. Interneurons are found in the CNS, not PNS. So 3 is incorrect.
Explanation:
Differential centrifugation separates organelles by size and density by spinning homogenized cells at progressively higher speeds. Each pellet is enriched in a particular organelle. Density gradient centrifugation further refines separation. Electrophoresis separates by charge/size, chromatography by differential partitioning, spectrophotometry measures absorbance.
Explanation:
Autotrophs produce organic compounds from inorganic CO₂ and water using light energy (photosynthesis). This exactly defines green plants. So both are true, and R explains A.
Explanation:
Adenylyl cyclase converts ATP to cyclic AMP (cAMP), a second messenger. Phosphodiesterase breaks down cAMP, PKA is activated by cAMP, PLC produces IP₃ and DAG.
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