Multiple Choice Questions

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The part of the bacterial chromosomes sharing homology with genome fragment transferred from the recipients to cell during emrozygote formation is known as

  • Eugenic

  • Exogenate

  • Endogenate

  • Dysgenic


C.

Endogenate

ENdogenate is the native DNA of the recipient bacterial cell which shares homology with the DNA Fragment inserted into it.

Exogenate is the DNA fragment that has been transferred into a recipient cell.

Eugenic is the study or practice of attempting to improve the human gene pool by encouraging reproduction among people with desirable traits. Dysgenics is the study of factors causing propagation of undesirable or disadvantageous genes and traits.


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Which of the following is true regarding the phase lambda, a virus which infects bacteria?

  • In the lytic cycle, the bacterial host replicates viral DNA, passing it on to daughter cells during binary fission

  • In the lysogenic cycle, the bacteria-host replicates viral DNA, passing it onto daughter cells during binary fission

  • In the lytic cycle, viral DNA is integrated into the host genome

  • In the lysogenic cycle, the host bacterial cell burst, releasing phases


In 1944, Avery, McCarty and MacLeod isolated substance from heat killed a virulent form of bacteria and added to the non-virulent form of bacteria which changed the non-virulent to virulent from this substance can be destroyed by

  • DNAse

  • Protease

  • Lipase

  • Amylase


One gene-one enzyme relationship was established for the first time in

  • Neurospora crassa

  • Salmonella typhimurium

  • Escherichia coli

  • Diplococcus pneumoniae


The codon for anticodon 3-UUUA-5' is

  • 3-AAU-5

  • 5-UAAA-3

  • 5-AAAU-3

  • 3-UAAU-5'


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The Okazaki fragments in DNA chain growth

  • Results in transcription

  • Polymerise in the 3' to 5' direction and forms replication fork

  • Prove semi-conservative nature of DNA replication

  • Polymerise in the 5' to 3' direction and explain 3' to 5 DNA replication


Nucleic acid segment tagged with a radiactive molecule is called

  • Clone

  • Probe

  • Plasmid

  • Vector


A polygenic inheritance in human beings is

  • Skin colour

  • Sickle cell anaemia

  • Colour blindness

  • Phenylketonuria


A kind of biotechnology involving manipulation of
DNA is

  • DNA replication

  • Genetic engineering

  • Denaturation

  • Renaturation


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Match the following column I with column II.

Column I Column II
A. Carcinogen 1. Cancerous Tumour
B. Anaphase -I 2. Disjunction
C. Mitosis 3. Synapse
D. Zygotene 4. Plectonemic Coiling

  • A-1, B-2, C-4, D-3

  • A-3, B-1, C-4, D-2

  • A-2, B-3, C-1, D-4

  • A-4, B-1, C-3, D-2


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