19. The type of mutation caused by removal of one nucleotide in the above mRNA i

Question

19. The type of mutation caused by removal of one nucleotide in the above mRNA is. a. Insertion mutation b. Substitution mutation c. Deletion mutation d. Point mutation e Cand D above are correct 20. Change of the last "A" nucleotide in question 18 mRNA to"C will result to what type of mutation? a. Nonsense mutation b. Deletion mutation c. Frame shift d. Missense mutation e. None of the above 21. Which of the following is not true of mutation a Mutation may have no effect on the organism b. Mutation always lead to lethality c. Mutation sometimes have lead to evolution of new genes d. Mutation may lead to chromosomal anomalies e. None of the above 22. A mixture of DNA, mRNA, tRNA and ribosomes all isolated from mouse tissue is found capable of carrying out protein synthesis. Which of these can be removed from the system without causing immediate ceasation of protein synthesis. a. Ribosomes b. mRNA c. DNA d. tRNA e. Amino acids The process of gene expression during which DNA is copied into RNA is known as a. Replication b. Translation c. Transcription d. Duplication 23· Operator is a term for: a. Several adjacent cistrons whose transcription is initiated at a single promoter b. A section of DNA that controls the activity of an operorn c. A gene sales man d. A gene that specifies a repressor 24.

Explanation / Answer

20.

Change of A to C nucleotide results in missense mutation.
Option d

21.

Mutations are sometimes beneficial and sometimes harmful.
But they do have effect on the organism.
Option b is the answer

22.
DNA is not needed as there is RNA.
Option c is the answer

23.
The processof making RNA from DNA is known as transcription.
Option c is the correct answer.

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