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2341. Which of the following nitrogenous bases is found only in RNA and not in DNA ?
A. Adenine
B. Guanine
C. Cytosine
D. Uracil
Explanation:
2342. Which of the following is biodegradable ?
A. Paper
B. D.D.T.
C. Aluminium
D. Plastic
Explanation:
2343. A mature mammalian cell without nucleus is
A. Lymphoblast
B. Erythrocyte
C. Spermatozoa
D. Trophoblast
Explanation:
2344. When a cell neither shrinks nor swells when kept in a fluid then the fouid in the cell in relation to ambient fluid is called
A. Hypertonic
B. Hypotonic
C. Isotonic
D. Hyalotonic
Explanation:
2345. The maximum fixation of solar energy is done by
A. bacteria
B. protozoa
C. fungi
D. green plants
Explanation:
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