2019-03-01 Biology Times

32

Biology Times (^) March 19
27.Sol: Original model of DNA as proposed by
Watson and crick in 1953 has 2 strands that are
helically coiled and each strand has opposite
polarity.
28.Sol: Only one strand is synthesized new hence
only one strand will be radioactive.

29. Sol:

30.Sol: Ribozyme =235 RNA

31.Sol:

32.Sol: Depends on AT or GC rich regions.

33.Sol: Only first two nucleotide are required for

idntification of an amin acid.

34.Sol: Conceptual

Excretory products and their elimination

1.Sol: Glucose from glomerular filtrate is reabsorbed

from proximal convulated tubule via active

transport.

2.Sol: Birds, arthopods,lizards and snakes are

uricotelic

Microbes in human welfare

1.Sol: Conceptual

Plant growth and development

1.Sol: SDP (Short day plants) or LNP (Long Night

Plants) flowers only when photoperiod is below

critical day length (Critical photoperiod) or they

are responsible to night length and flower when

night length is above critical dark period. In this

experiment plant flowers when dark period is

above 8 hrs.

So, it is SDP and actually measures night length

to flower

2.Sol: The only gaseous hormone out of these four

options is ethylene. Its main function is ripening

3.Sol: Concentration of ethylene gas es

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