Marasmus is a disease of severe malnutrition characterized by:
A. Overall wasting of body tissues and severe calorie-protein deficiency
B. Bone deformities
C. Bleeding gums
D. Edema and fatty liver
Answer: Option A
Solution (By JKExamLibrary)
Marasmus is a form of severe malnutrition caused by a deficiency of both calories and protein. It results in extreme wasting of muscle and subcutaneous fat, making the child look emaciated or 'wasted'. Unlike kwashiorkor, marasmus typically does not present with edema. The child is extremely weak, has a 'old man' face, and is highly susceptible to infections.
Explanation:
The double helix structure of DNA was proposed by James Watson and Francis Crick in 1953, based on X-ray diffraction data produced by Rosalind Franklin and Maurice Wilkins. They proposed that DNA consists of two antiparallel polynucleotide chains coiled around a common axis, with specific base pairing (A-T, G-C) holding the strands together.
Explanation:
The potato is a modified underground stem known as a tuber. It stores food (starch) and has 'eyes' which are actually axillary buds capable of growing into new plants. This distinguishes it from modified roots like sweet potatoes, which do not possess nodes, internodes, or buds.
Explanation:
Sulfur is present in the amino acids methionine and cysteine (which forms disulfide bonds in proteins). Nitrogen is in all amino acids, phosphorus in nucleic acids and ATP, iron in heme. Sulfur is also in vitamins biotin and thiamine. Disulfide bonds are crucial for protein tertiary structure.
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