Consider the following statements about vitamins: 1. Vitamin C deficiency causes scurvy. 2. Vitamin D deficiency causes beriberi. 3. Vitamin A deficiency causes night blindness. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
Fossils are the preserved remains or impressions of past organisms, showing transitional forms and evolutionary change over geological time.

Explanation:
Acetylcholine is an excitatory neurotransmitter at neuromuscular junctions and many CNS synapses. GABA and glycine are generally inhibitory in the CNS. Serotonin modulates mood but can have inhibitory or excitatory effects depending on receptors. Neurotransmitters are chemical messengers released from synaptic vesicles into the synaptic cleft to bind to postsynaptic receptors.

Explanation:
Vitamin B₆ (pyridoxine, pyridoxal, pyridoxamine) is a coenzyme (pyridoxal phosphate, PLP) for many enzymes involved in amino acid metabolism, including transaminases and decarboxylases. B₁ acts in carbohydrate metabolism, B₂ in redox reactions, B₁₂ in methylation and DNA synthesis.