87. The following are the statements regarding the development and maintenance of anterior
and posterior compartments in each segment of Drosophila :

(i) | Expression of wingless and engrailed is activated by pair-rule genes.

(ii) Continued expression of wingless and engrailed is maintained by interaction
between the cells expressing Engrailed and Wingless proteins

(iii) Hedgehog is expressed in wingless expressing cells and forms short range
gradient

(iv) Hedgehog is a transcription factor

(ए) Engrailed is a secretory factor and binds with the patched receptor of the
wingless expressing cells.

Which of the following combinations of above statements is correct ?

(ಯ Git) & (v) (B) (10, Gv) & (९)

(C) Gv) & (९) ட) ൭൭൭

88. Some Drosophila larvae are exposed to 37 °C during their growth. One of the adult flies
first emerged had a crossveinless phenotype. Crossveinless is a known mutant in
Drosophila. When this crossveinless fly was crossed to a known crossveinless mutant fly,
all the progeny had a normal phenotype. The observed phenotype is an example of :

(4) Phenocopy (8) Pleiotropy
(೮) Penetrance (D) Conditional mutant

89. The International treaty adopted to regulate the production and use of chemicals that
contribute to the depletion of Earth’s ozone layer is known as :
(^) Rio de Janeiro Conference (B) Montreal Protocol
(C) The Vienna Convention (2) The Kyoto Protocol

90. ಆ. Protein Coupled Receptors (GPCRs) are used to detect and respond in many different
types of signals and function as molecular switches.
Regarding GPCR which one of the following statements is INCORRECT ?
(4) The ‘on’ form gets bound to 8 & y subunits and activates a membrane bound
effects like adenylyl cyclase, phospholipase C or ion channel.
(B) GPCRs are coupled to trimeric G proteins comprising three subunits a, B & y.
(C) The © subunit is a GTPase switch protein that alternates between an active
(on) state with bound GTP and an inactive (off) state with GDP.
(D) GPCRs with a common structure of seven membrane spanning ൨ helices.

91. Following are the key points about the effect of genetic drift :
(i) ബേം drift can cause allele frequencies to change in a pre-directed way.
(ii) Genetic drift is significant in small populations
(iii) Genetic drift can lead to a loss of genetic variation within populations
(iv) Genetic drift can cause harmful alleles to become fixed.
Which one of the following combinations are true ?

(A) (i) ‏ع‎ (ii) only (B) (ii) & (iii) only
(0 () (ii) & (iii) (0) ൧,൬൭൬
92. Which of the following is a sequence alignment tool ?
(^) BLAST (B) PROSITE
(C) PIR (D) PRINTS
4 STB 1 "0100001

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