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NEET Biology Solved Question Paper 2006

Multiple Choice Questions

61.

In which stage of the first meiotic division, each chromosome undergoes longitudinal division to give rise to two sister chromatids ?

Zygotene
Diplotene
Diakinesis
Pachytene

62.

In biotic community, which of the following can be called protective device ?

Mimicry
Symbiosis
Competition
Parasitism

63.

Which of the following enzymes is used to join bits of DNA?

Ligase
Primase
Endonuclease
DNA polymerase

64.

All eukaryotic genes contain two kinds of base sequences. Which of the following plays role in protein synthesis ?

Introns
Exons
Electrons
Both (a) and (b)

65.

The direction of DNA replication is from :

amino acid end
3' end towards 5' end
5' end towards 3' end
amino terminus to carboxy terminus

66.

In operon concept, regulator gene functions as:

repressor
regulator
inhibitor
initiator

67.
Mirabilis jalapa is an example of

complete dominance

supplementary gene

incomplete dominance

complementary gene

incomplete dominance

Incomplete dominance is the phenomenon of neither of the two alleles being dominant so that expression in the hybrid is intermediate between the expressions of the two alleles in homozygous state. Eg. Inheritance pattern in Mirabilis jalapa flower. In this plant, two allelomorphic pair of the genes are not related as dominant and recessive. But the dominant gene in heterozygous condition has reduced expression, so that each
of them expresses itself partially.

There are 2 types flower colour in pure state: red and white. When the two types of plants are crossed, hybrid or plants of F₂ generation have pink flowers. If the latter are selfed, the plants of F₂ generation are of 3 types- red, pink and white.