AIPMT 2006 question paper with solutions

193 questions · 180 min

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Sample questions with solutions

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F $_2$ generation of the cross RRYY × rryy ?

A.
Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons
B.
Only wrinkled seeds with green cotyledons
C.
Only wrinkled seeds with yellow cotyledons
D.
Only round seeds with green cotyledons

Answer: A

Determine the $F_1$ genotype and phenotype. Given the cross $RRYY \times rryy$ , all $F_1$ offspring are

RrYy \ (\text{round, yellow — since both dominant traits are expressed})

Self the $F_1$ heterozygote to get $F_2$ . Since $R$ and $Y$ assort independently, self-crossing $RrYy \times RrYy$ produces the standard

9:3:3:1

phenotypic distribution across four categories.

List the four resulting phenotype categories. These four categories are: round-yellow, round-green, wrinkled-yellow, and wrinkled-green.
Match this to the given options. Since option A mentions both 'round seeds with yellow cotyledons' and 'wrinkled seeds with yellow cotyledons' as being present among the F2 phenotypes (which is indeed true, since both of these categories do appear, alongside the other two not mentioned),

Hence, the correct answer is Option A.

In a cereal grain the single cotyledon of embryo is represented by

A.
coleoptile
B.
coleorhiza
C.
scutellum
D.
prophyll.

Answer: C

In a monocot cereal grain, the embryo has only a single cotyledon rather than two.
This single cotyledon is specifically named the scutellum, and it also functions to absorb nutrients from the endosperm during germination.
The coleoptile is a protective sheath covering the young shoot (plumule), and the coleorhiza is a protective sheath covering the young root (radicle) — neither of these represents the cotyledon itself.
Hence, the answer is Option C: scutellum.

Which antibiotic inhibits interaction between tRNA and mRNA during bacterial protein synthesis ?

A.
Neomycin
B.
Erythromycin
C.
Tetracycline
D.
Streptomycin

Answer: A

Recall how certain antibiotics target bacterial translation.

Given that different antibiotics can interfere with specific steps of the bacterial protein synthesis machinery, each has a distinct mechanism of action.

Identify the antibiotic that specifically blocks tRNA-mRNA interaction.

Since Neomycin works by disrupting the proper interaction between tRNA and mRNA at the ribosome, it selectively inhibits bacterial translation without significantly affecting the host cell's own protein synthesis.

Note the other antibiotics for context.

Given that Erythromycin, Tetracycline, and Streptomycin also inhibit bacterial protein synthesis but through different specific mechanisms (such as blocking ribosomal translocation or binding at different sites), they do not match this specific tRNA-mRNA interaction blockage.

Conclusion: Hence, the answer is A, Neomycin.

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