The 'Rh factor' was first discovered in the blood of which animal, giving it its name?
A. Rabbit
B. Rat
C. Rhesus monkey
D. Reindeer
Answer: Option C
Solution (By JKExamLibrary)
The Rh factor (Rhesus factor) is an inherited protein found on the surface of red blood cells. It was discovered in 1940 by Karl Landsteiner and Alexander Wiener. They immunized rabbits and guinea pigs with the red blood cells of the Rhesus monkey (Macaca mulatta). The serum produced contained antibodies that agglutinated the red blood cells of about 85% of humans. These individuals were designated Rh-positive, and the rest Rh-negative.
Explanation:
The nucleolus is a dense region within the nucleus where ribosomal RNA (rRNA) is transcribed and ribosomal subunits are assembled. Chromatin is DNA-protein complex, nucleoplasm is the fluid, nuclear pores regulate transport.
Explanation:
Poliovirus attacks motor neurons in the spinal cord and brainstem, causing paralysis. It spreads via the fecal-oral route. Vaccination (IPV/OPV) has almost eradicated it globally. The virus replicates in the intestine and then invades the nervous system. Polio survivors may suffer post-polio syndrome later.
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