Question

Please answer all.... Thank you!

82) When we altered gene triplet in the DNA produces a chain-terminating codon in the mRNA, the (1pts) result is called a reverse mutation nonsense mutation missense mutation spontaneous mutation frameshift mutation 83) A single base substitution changes the sixth amino acid in a protein from glutamic acid (GAG) (1pts) to valine (GUG). This kind of genotypic change is called a i. transition type of mutation ii. frameshift mutation iii. transversion type of mutation iv. point mutation v. missense mutation O., iv and V. ii. and iii. Oiii, iv. and V O ii, iii. and V. 84) Which of the following statement regarding conjugal bacterial recombination is true? (1 pts) The participating cells must fuse (cell-cell contact) before reassortment of genes occur. The exchange of genetic material is typified by the complete transfer of the donor's genome. The donor cell becomes a merozygote after it has passed some of its chromosomal genes to the recipient cell The transfer of genes from one cell to another is accomplished by means of bacteriophage (virus). O All of the above are correct.

81)If a polypeptide chain contains 600 amino acids, then the gene coding for this polypeptide must contain _____.

	600 nucleotides
	1200 nucleotides
	1800 nucleotides
	1800 codons
	1800 anticodons
	More than one of the above are correct.

Answer 1

81. If the polypeptide chain contains 600 amino acids, then the gene coding for thiws polypeptide must contain 1800 nucleotides.
It is beccause a single amino acid is coded by 3 nucleotides, so for 600 amino acids, 600 x 3 = 1800 nucleotides are needed.

82. Answer to this question is NONSENSE MUTATION.
(explanation: A nonsense mutation is the type of mutation, in which a substitution of the base leads to the termination of the translation process.)

83.Answer is III, IV, V
It is a MISSENSE MUTATION because when a single nucleotide change in the RNA sequence leads to the change of the amino acid in the protein sequence, it ioscalled missense mujtatio, as in the case ghiven here in which Glutamic acid is changed into Valine.
Also the mutation is POINT MUTATION because the change is only in a single nucleotide base. And also the mutation is TRANSVERSE MUTATION because the nucleotide change occurs from Purine to Pyrimidine.