In human blood, the universal recipient blood group is:
A. AB positive
B. B positive
C. A negative
D. O negative
Answer: Option A
Solution (By JKSSB Mock Tests)
AB positive blood has both A and B antigens and the Rh antigen, so it lacks antibodies against A, B, or Rh. Hence, individuals with AB+ can receive red blood cells from any donor without agglutination. O negative is the universal donor. Compatibility depends on antigens on donor RBCs and antibodies in recipient plasma.
Explanation:
Genetics is the science of heredity and variation, explaining how traits are passed from parents to offspring and why individuals differ. Ecology studies organisms and environment, embryology deals with development, paleontology with fossils. Gregor Mendel is the father of genetics. The term 'genetics' was coined by William Bateson.
Explanation:
Vaccination involves the introduction of a weakened, killed, or partial pathogen (antigen) into the body. This stimulates the immune system to produce its own antibodies and memory cells without causing the disease. Since the body actively produces the immune response due to an artificial stimulus, it is called artificial active immunity.
Explanation:
Propionibacterium shermanii ferments lactate to propionic acid, acetic acid, and CO₂ during cheese ripening; the CO₂ forms the characteristic holes (eyes) in Swiss cheese. Lactobacillus and Streptococcus are starter cultures for acid production, Penicillium roqueforti is used for blue cheese.
No comments yet. Be the first to start the discussion!