Which of the following is a \"mitotic\" event. A. Short repetitive sequence (mic

Question

Which of the following is a "mitotic" event. A. Short repetitive sequence (microsatellite) B. Single nucleotide polymorphism (SNPs) C. Sister-chromatic exchanges (SCE) D. Multigenic inheritance Chromosome of one species is lost and only a "few chromosomes of the other species remain during the continued culturing of the hybrid cell" produces following: A. Heterokaryon B. Synkaryon C. Eukaryon D. Harlequin chromosomes Irregular looping outtakes place in following conjugation type giving a merozygote: A. Regular B. Hfr C. F' (prime) D. Transduction Which of the following transduction methods target ONLY certain genes to be transferred? A. Regular B. Generalized C. Specialized D. None of the above By what structure fertility factor are transferred from one to another bacterium during conjugation? A. Pseudopodium B. Tentacles C. Cilia D. Pilus A mutant bacterium for a particular nutrient cannot grow in a medium that lacks that nutrient is known as: A. Autotroph B. Heterotroph C. Auxotroph D. All of the above The bacterial cells that can pickup naked DNA from outside (extracellular) during transformation are known as? A. Recombinant cell B. Genetically engineered cells C. Competent cells D. Helper cell

Explanation / Answer

13.c.Sister chromatid exchange is a mitotic event that occurs in the crossing over.

14.B.Synkaryons are cells where the nuclei from two different parent cells have fused. The resulting cell has a common cytoplasm and a common nucleus.

15.D. Harlequin chromosomes -

16c.One example of how merozygotes can be formed is the transfer of genetic material of an Hfr cell to an F- cell through conjugation. When an Hfr cell mates with an F- cell, the chromosome acts as a rolling circle transferring a part of its genomic chromosome across a conjugation bridge.

17.C. specialized transduction-It is the process by which a restricted set of bacterial genes is transferred to another bacterium. The genes that get transferred (donor genes) depend on where the phage genome is located on the chromosome.

18.Pilus- help in conjugation

19.cauxotroph-.a mutant organism (especially a bacterium or fungus) that requires a particular additional nutrient which the normal strain does not.

20.c.competent cells-  E. coli cells are more likely to incorporate foreign DNA if their cell walls are altered so that DNA can pass through more easily. Such cells are said to be "competent." Cells are made competent by a process that uses calcium chloride and heat shock.

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