Biology Times (^19)
March
- Chasmogamy refers to the condition where
(a) Flowers remain closed
(b) Flowers absent
(c) Flowers gamopetalous
(d) Flowers open - Match the following columns.
Column I Column II
A. Ovule 1. Endosperm
B. Funiculus 2. Ovule
C. Nucellus 3. Seed
D. Polar nuclei 4. Perisperm
Codes
A B C D
(a) 3 2 4 1
(b) 2 3 4 1
(c) 2 3 1 4
(d) 3 2 1 4 - Dicot embryo consists of
(a) Radicle and plumule
(b) Radicle, plumule, cotyledons and sometimes
endosperm
(c) Radicle, plumule, cotyledons and tegmen
(d) Radicle, plumule, cotyledons, tegmen and
testa - Before a deletion occurred , the gene sequence
was ABCDEF, now it is
(a) ABDBEF (b) ABDEF
(c) FEDCBA (d) ABEDCF
31.The evidence that crossing over occurs at four
stranded stage and not at two stranded stage of
the chromosomes, comes from
(a) Studies on linkage maps of chromosomes in
Drosophila
(b) 4:4 arrangement of ascospores in Neurospora
(c) Studies of meiosis in maize
(d) 2:2:2:2 arrangement of ascospores in
Neurospora - In erythroblastosis foetalis , which factor of the
mother pass through placenta into the foetus
(a) Agglutinins (b) Rh antigens
(c) ABO antibodies (d) Rh antibodies - In E.coli , ‘lac’ operon is induced by
(a) â-galactosidase (b) ‘I’gene
(c) promoter gene (d) lactose - DNA replicates semi-conservatively was first
shown in :
(a) E.coli
(b) Vicia faba
(c) Drosophila
(d) Caenorhabditis elegans
35. The transcription unit is
(a) TATA box to start point
(b) Start point to stop codon
(c) 35 sequence to start point
(d) TATA box to stop codon
36. Translocation involves
(a) The movement of the mRNA strand one
triplet length in the A-site
(b) The release of the unattached tRNA from the
E-site
(c) The movement of the tRNA from the A-site to
the P-site
(d) All of the above
37. In recent era the pencillin producing P. notatum
replaced by
(a) P. spinulosum (b) P. camemberti
(c) P. chrysogenum (d) P. marneffei
38. Roquefortii cheese employs this fungi for
ripening ___
(a) Penicillium camembertii
(b) Penicillium sharmanii
(c) Penicillium roquefortii
(d) Penicillium notatum
39. A genetically engineered microorganism use
successfully in bioremediation of oil spills is a
species of
(a) Xanthomonas (b) Pseudomonas
(c) Trichoderma (d) Trichothecium
40. Gene amplication using primers can be done by
(a) ELISA
(b) Polymerase chain reaction
(c) Gel electrophoresis
(d) Microinjection
41. Identify the incorrect statement
(a) Taq DNA polymerase is essential for PCR
(b) Taq DNA polymerase is not thermostable
(c) In PCR , two nucleotide primers are used
(d) Taq DNA polymerase is isolated from Thermus
aquaticus
42. Cloning gene is a process where
(a) Fragments of DNA are transferred from one
organism to another usually carried on a DNA
vector
(b) Gene is cloned in a animal
(c) Fragments of DNA cloned in the same
organism using carrier
(d) DNA is cloned in plants
43. Human Insulin is being commercially produced
from a transgenic species of
(a)Rhizobium (b) Saccharomyces