The Inducer of Lac Operon binds to?
NEET Botany Model Paper-2.. Continuation….
27) diagrammatic representation of chromosome is known as ?
a) Idiotype b) Karyotype
c) Homotype d) Holotype
Ans : b
Karyotype refers to a representation of relative size, shape and number of chromosomes and position of the centromere in a complete set of chromosomes. Karyotypes are species specific and are used to study their phylogenetic relationship.
28) The term linkage was coined by ?
a) W.Sutton b) T.H Morgan
c) G.Mendel d) T.Boveri
Ans : b
The term linkage was coined by TH Morgan. He carried out several dihybrid crosses in Drosophila to study genes that were sex-linked. He described the physical associ- ation of genes on a chromosome.
29) Which one of the following is not a method of in situ conse- rvation of biodiversity?
a) Biosphere Reserve
b) Wildlife Sanctuary
c) Botanical Garden
d) Sacred Grove
Ans : c
In-situ conservation is done by conserving the species in their natural habitats. It is the best way of biodiversity conservation. Examples include sacred groves, national parks, biosphere reserv -es, san of selected plants and animals in selected areas outside their natural habitat is known as ex-situ conservation. The ex-situ conservation strategies include botanical gardens, zoological gardens, conservation stands and gene, pollen, seed, seedling, tissue culture and DNA banksanctuaries.
All eukaryotes have three different RNA polymerases (RNAPs) which transcribe different types of genes. RNA polymerase I transcribes rRNA genes, RNA polymerase II transcribes m RNA, miRNA, snRNA, and sno RNA genes, and RNA poly-merase III transcribes tRNA and 5S rRNA genes
hnRNA stands for heterogeneous nuclear RNA. It refers to the large pre‐mRNAs of various nucleotide sequences that are made by RNA Polymerase II, and processed in the nucleus to become cytoplasmic mRNAs. RNA Capping RNA Polymerase II Transcription.
30) List-1 List-2
1) RNAPolymerase-III a) hn RNA
2) DNA Polymerase b) r-RNAs
3) RNA Polymerase-II c) t-RNA
4) RNA Polymerase-I d) DNA
1 2 3 4
a) c d b a
b) c d a b
c) d c a b
d) a d c b
Ans : b
31) The Inducer of Lac Operon binds to
a) Repressor protein
b) Repressor gene
c) Operator gene
d) Promoter gene
Ans : a
The inducer in the lac operon is allolactose. If lactose is present in the medium, then a small amount of it will be converted to allolactose by a few molecules of β-galactosidase that are present in the cell. Allolactose binds to the repressor protein
32) choose correct statement ?
a) A-DNA _____Right handed and 11bp & 250A (Major groove-Narrow very deep & Minor groove -very wide & shallow & dehydrated DNA, clockwise ) (Anti-glycoside bond coformation ,C-31 endo)
b) B-DNA_____Discovered by Rosalind Franklin -Right handed +10bp+ 340A( ( Major groove-wide depth Minor groove- narrow depth, fully Hydrated DNAclockwise) (Anti-C-21endo)
c) Z-DNA______Discovered by Alexander rich-Left handed, 460A, (Major groove-flattened out on helix surface,Minor groove-extremely narrow and very deep .,Glycosidic conformation-Anti-pyramidins, Syn-purins) (C-21pyramidins, C-31purins)
d) C-DNA-9bp & D-DNA-8bp
a) c & a b) b& c c) d& a d) above all
Ans :d
33) What is the correct order of the taxonomic hierarchy?
a) kingdom, phylum or division, class, order, family,genus, species.
b) kingdom, phylum or division, class,family,order ,genus, species
c) kingdom, phylum or division, class, order, family, species, genus
d) kingdom, phylum or division, family, class, order, species, genus
Ans :a
34) Double fertilisation is characteristic of____?
a) Pteridophyta
b) Angiosperms
c) Bryophyta
d) Gymnosperms
Ans :b
Double fertilisation is a unique phenomenon that occurs excl-usively only in Angiosperms.
35) which the female gamete (e.g. egg cell) is significantly larger than the male gamete and is non-motile is known as ____
a) Anisogamy b) Isogamy
c) Autogamy d) Oogamy
Ans : d
36) Placentation in tomato is lemon____?
a) Marginal b) Axile
c) Parietal d) Free central
Ans : b
both the tomato and lemon, the ovary is multilocular and the ovules are borne on the central placenta. This type of placentation is called the axile placentation. Apart from tomato and lemon, Hibiscus, Allium and Solarium also show axile placentation.
37) Casparian strips are found in ?
a) Epidermis b) Hypodermis
c) Periderm d) Endoderm
Ans : d
casparian strips are present both in monocot and dicot roots. These are the characteristic bands of thickening made up of both Sube rin and lignin. … Roots absorb water and water enters through root hairs , moves into the parenc-hyma cells of cortex and through endodermis and pericycle enters into xylem
38) Which of the following events occurs during G1phase
a) DNA Replication
b) Growth and normal function of cell
c) mutation d) Fertilization
Ans :b
The G1 phase is often referred to as the growth phase, because this is the time in which a cell grows
39) During which stage of mitosis do chromatids separate to form two sets of daughter chro mosomes?
a) Interphase b) Prophase
c) Metaphase d) Anaphase
Ans :d
40) Differentiated cell remains at which stage?
a) G1 b) G2 c) Go b) M
Ans :c
G0 phase is viewed as either an extended G1 phase, where the cell is neither dividing nor preparing to divide, or a distinct quiescent stage that occurs outside of the cell cycle.
41) Which one is the free living anaerobic nitrogen fixer?
a) Azotobacter
b) Beijerinckia
c) Rhizobium
d) Rhodospirillum
Ans : d
Rhodospirillum is a free-living, anaerobic nitrogen fixer bacteria. It can synthesize its food in presence of light under anaerobic condition.nitrogen fixing bacte- ria which converts atmospheric nitrogen into ammonium compo- unds and make it available to the plants. Rhizobium is a symbiotic nitrogen fixer. It lives in symbiotic association with the legumes. Azotobacter and Beijerinckia are free-living aerobic nitrogen fixer
42) The primary electron acceptor in PS-II is ?
a) Ferredoxin b) PQ
c) Plastocyanin d) Pheophytin
Ans : d
Excited P680 is a good electron donor and can transfer its excited electron to the primary electron acceptor, pheophytin.
43)The most abundant protein in nature is probably the chloroplast enzyme ?
a) RuBP b) PGA
c) PEP -CASE
d) Ribulose bisphosphate carbox ylase/oxygenase
The most abundant protein in nature is probably the chloroplast enzyme ribulose bisphosphate carboxylase/oxygenase (Fraction I protein). It is arguably the most important enzyme because it catalyses the carbon dioxide-fixing step in photosynthesis.
44) Richmond-Lang effect is related to
a) Auxins b) Gibberellins
c) Cytokinins d) ABA
Ans :c
Richmond Lang effect is the retardation of aging due to the application of the plant regulator cytokinins. The regulator acts by retarding the rate of destruction of chlorophyll and yellowing of leaves.
45) Avena curvature is used for bioassay of ?
a) IAA b) ABA
c) GA.3 d) Ethylene
Ans : a
The Avena geo-curvature test is a bioassay for (auxin IAA)-type growth regulators. Etiolated oat coleoptiles are used and the test is conducted in special perspex trays under diffuse daylight IAA is a natural plant produced aux
Biotechnology & its applications
IMPORTANT BITS FOR NEET
1. Which of the following techniques use genes and DNA molecules for diagnoses of diseases?
a) Gene therapy
b) Recombinant gene technology
c) Polymerase chain reaction
d) All the above
2. Earlier which animals were used to test the safety of Polio Vaccine
a) Transgenic rat
b) Transgenic pigs
c) Transgenic mice
d) Transgenic sheep
3. The organizations whose genetic material has been altered using genetic engineering is called as –
a) Genetically mutant organism b) Genetically modern organism
c) Genetically modified organism
d) Genetically transferred organism.
4. Full form of GMO is –
a) Genetically mutant organism b) Genetically modern organism
c) Genetically modified organism
d) Genetically transferred organism
5. Which of the following is responsible for causing disease in plants?
a) virus b) pesticide
c) Herbicide d) all the above
6. Bt stands for –
a) Biotechnology
b) Bacteria tolerant
c) Bacillus thuringiensis
d) Bollworm toxin
Sabbidi Ramesh
Lecturer in Botany & Neet faculty,
Govt Junior College,
Banswada-
8179227595.
