21. Transfer of genetic material from one cell to another that can alter the genetic makeup of recipient cell is called
Mutation
Transduction
Replication
Variation
✅ The correct answer is option B.
Biology
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22. The experiments on DNA molecules in chromosomes for knowing the basis of inherited diseases are conducted by :
Molecular biologists
Microbiologists
Freshwater biologists
Social biologist
✅ The correct answer is option A.
23. Which of the following fish drink a large amount of seawater and excrete concentrated urine resulting in maximum salt excretion and minimal water loss?
Hagfish
Freshwater Fishes
Bony fishes
None of these
✅ The correct answer is option C.
24. Who discovered DNA?
P.A.Levene
Frederick Griffith
Friedrich Miescher
Rosalind Franklin
✅ The correct answer is option C.
25. Sythetic insulin from pork was formed by which technique:
Parasitology
Social biological techniques
Biotechnology
Both a and c
✅ The correct answer is option C.
26. Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining.
Excessive urea which will increase their internal solute concentration and prevent body shrinkage in a hypertonic environment
Trimethyl alanine
Ammonia
Trimethylamine oxide
✅ The correct answer is option D.
27. DNA contains
Purines (A and G) pyrimidines (U and C)
Purines (T and C) pyrimidines (A and G)
Purines (A and C) pyrimidines (U and G)
Purines (A and G) pyrimidines (T and C)
✅ The correct answer is option D.
28. The branch of biology which deals with the study of social behavior and communal life of human beings living in any environment is called :
Environmental biology
Social biology
Human biology
Both b and c
✅ The correct answer is option B.
29. In DNA
A forms two bonds with T
G forms three bonds with C
A forms three bonds with T
Both a and b
✅ The correct answer is option D.
30. Out of 92 naturally occurring chemical elements how many are considered as bio-elements:
6
16
26
15
✅ The correct answer is option B.