Which of the following blood cells is responsible for humoral immunity?
A. Neutrophils
B. T lymphocytes
C. B lymphocytes
D. Macrophages
Answer: Option C
Solution (By JKSSB Mock Tests)
B lymphocytes differentiate into plasma cells that produce antibodies (immunoglobulins) against specific antigens, providing humoral immunity. T cells mediate cellular immunity, macrophages and neutrophils are phagocytes.
Explanation:
Translation occurs at ribosomes, where tRNA anticodons recognize mRNA codons and add the corresponding amino acids to a growing polypeptide chain. Replication duplicates DNA, transcription synthesizes mRNA from DNA, translocation is movement of chromosomes or protein transport.
Explanation:
The pineal gland secretes melatonin in a daily rhythm, peaking at night, thus regulating the sleep-wake cycle and seasonal biological rhythms. The pituitary controls other glands, thyroid metabolism, adrenals stress response. Light signals from the retina influence pineal activity.
Explanation:
Amphibians have two atria and one ventricle; mixing of blood occurs because of the single ventricle. Complete separation is achieved only in four-chambered hearts. So A true, R false.
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