عملي جيناتك

……………. is the part of total cell cycle for cells undergoing division.

• Meiosis

• Mitosis

• Cell division

• Interphase

The initial event in the cell cycle is the growth phase, called ………….

• Meiosis

• Mitosis

• Cell division

• Interphase

The rate of mutation is increased either by using physical or chemical agents and this process is called as ………….

• Mutation

• Cytogenesis

• Genetics

• Mutagenesis

The mutation from a mutant phenotype back to the original wild type phenotype is referred as …………..

• Reverse Mutation

• Phenotype

• Intergenic

• Extragenic

The ionizing radiations such as X-rays about ……….. are of high energy and can penetrate living tissues

• 0.3 to 2 nm

• 0.1 to 1 nm

• 1 to 8 nm

• 0.8 to 7 nm

The maximum absorption of UV by DNA is at wavelength of ………… nm

• 300

• 210

• 260

• 600

Uracil is produced in the DNA by deamination of cytosine by…………

• Nitrous acid

• Lactic acid

• Hydrochloric acid

• Sulfuric acid

The enzyme ………….. removes uracil from DNA creating an AP site.

• Uracil-RNA glycosylase.

• Adenine-DNA glycosylase.

• Cytosine -DNA glycosylase.

• Uracil-DNA glycosylase.

Change in the number of chromosomes is called ……….

• Meiosis

• Ploidy

• Mitosis

• Mutation

The Russian Cytologist …………. first synthesized an allotetraploid genus called Rhaphanobrassica from the artificial crosses between vegetables belonging to different genera.

• Einstein

• Pasteur

• Karpechenko

• Edison