21) Viruses can move through host membrane to the nucleus where the nucloic acld

Question

21) Viruses can move through host membrane to the nucleus where the nucloic acld replicating cells. What is necessary for a virus to migrate from the cellular enzymes are localized? Facilitated Diffusion Endocytosis Motor Protein Active Transport None of the above 22) Each process can increase the genetic ncrease the genetic variation in a prokaryotic population except for Transformation Conjugation Binary Fission Transduction Mutation 23) There are advantages and disadvantages to the various types of reproduction observed in the animal kingdom. What is one benefit of sexual reproduction? The production of genetically-identical offspring The ability to reproduce without a mate The transmission of beneficial pathogens The injuries that occur during combat or mating The increase in genetic variation in populations 24) What is one benefit of asexual reproduction? The offspring differ genetically from both parents The absence of sexually-transmitted diseases The energy consumed when searching for a mate The transmission of beneficial pathogens among hosts None of the above 25) In some animal species, isolated females give birth to live offspring that developed from a female gamete. How is this possible? Budding Regeneration Conjugation None of the above

Explanation / Answer

22. Binary fission

It plays no role in genetic variations as it just involves splitting of one parent cell into two cells. It's a mode of asexual reproduction where only one parent is involved. Variation if any during this process is only dependent on errors in DNA replication

23. Increase in genetic variability in population

Reason: sexual reproduction involves two parents. In addition to this random combinations, crossing over also provide as a resource for accumulation of genetic variability.

24. Absence of sexually transmitted disease

Reasons

Sexually transmitted disease do not show occurrence in asexual reproduction because of presence of only one parent.

25. None of above

This process is called parthenogenesis. It is development of gamete directly to form young one without fertilisation.

21. Facilitated diffusion

There are many methods for transfer of virus from cell membrane to nucleus e.g. cytoskeleton modulation etc.

Different viruses use different mechanisms

Facilitated diffusion is used by few of them.

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