Medical Entrance Exams NEET practice set-6
Practice set-6
1. Scrapie is caused by prions in sheep. The system that is affected by these infectious particles is
(a) central nervous system
(b) respiratory system
(c) the circulatory system
(d) all of the above
2. A gene encoding a polypeptide of 40 amino acids has the 19th, 20th and 21st codons as AAA, UUU and GGG, respectively. If the codon UUU mutates to UAG, which one of the following would occur?
(a) The portion of gene after the mutated region degenerates
(b) A polypeptide of 39 amino acids is formed
(c) One polypeptide with lysine at its terminal end and other with glycine as its first amino acid is produced
(d) A polypeptide of 19 amino acids with a terminal lysine is produced
3. Identify the enzyme that cuts the two strands of DNA molecules at G-C site
(a) EcoR I (b) Hae III
(c) Sal I (d) Hind III
4. In maize, coloured endosperm (C) is dominant, over colourless (c), full endosperm (R) is dominant over shrunken type (r). When a dihybrid of F1 was test crossed, the phenotypes of progeny obtained were
coloured full – 46%,
coloured shrunken – 3%,
colourless full – 5%,
colourless shrunken – 46%,
From the above data, determine the distance between the two non-allelic genes
(a) 46 units (b) 5 units
(c) 3 units (d) 8 units
5. Indicate the number of zygotes and meiotic divisions required to produces 20 Spirogyra filaments after lateral conjugation
(a) 20, 20 (b) 10, 20
(c) 40, 20 (d) 5, 20
6. Which among the following has a mature embryo sac where there is a single synergid adjacent to the egg, 8 polar nuclei and 6 antipodals?
(a) Adoxa (b) Penaea
(c) Plumbago (d) Peperomia
7. Incomplete ecosystems
(a) lack decomposers and producers
(b) occur at abyssal depths of sea and caves, and lack producers
(c) lack all the four basic components of the ecosystem
(d) are artificial ecosystems and represent man-made ecosystems
8. Ovules of angiosperms are characterised by having one or two integuments around the nucellus. Identify from among the following plants in which the integuments are totally absent
(a) Chrysanthemum (b) Allium
(c) Loranthus (d) Pisum
9. Synthesis of phosphoenolpyruvate in the glycolytic pathway from 2-phosphoglyceric acid requires
(a) phosphoglyceric kinase
(b) phosphoglyceromutase
(c) phosphopyruvate kinase
(d) enolase
10. Opening of stomata in CAM plants does not
require
(a) the influx of K+ ions into guard cells
(b) movement of starch from chloroplast to the cytoplasm after hydrolysis
(c) the activity of phosphoenol pyruvic carboxylase for oxaloacetic acid synthesis
(d) diffusion of malic acid into cell vacuoles
11. The first product to have been cleared for commercial purpose formed by somatic hybridization is
(a) Golden rice (b) Pomato
(c) Triticale (d) Raphanobrassica
12. In which among the following the fossil record shows well-preserved cell walls?
(a) Cyanobacteria (b) Diatoms
(c) Euglenoids (d) Charophytes
13. The part of the poppy whose latex is used for obtaining opium is
(a) inflorescence axis
(b) unripe capsule
(c) petiole
(d) stem
14. Certain germination inhibitors like coumarin present in the seeds can be removed artifically by
(a) keeping the seeds under running water
(b) exposing the seeds to very low temperature
(c) keeping the seeds in a solution of auxin/gibberellin mixture
(d) both (a) and (b)
15. Which among the following represents sex-limited traits?
(a) Beard in human male
(b) Functional mammary glands
(c) Antlers in deer
(d) All of the above
16. The cotyledons of _______, _________ contains______ which is an antinutritional factor
(a) Lathyrus sativus, neurotoxin
(b) Lathyrus odoratus, haemotoxin
(c) Lathyrus aphaca, cardiotoxin
(d) Pisum sativum, hypnotoxin
17. In Selaginella, gametophyte can give rise to a sporophyte without gametic union. This phenomenon is known as
(a) apospory
(b) apogamy
(c) agamospermy
(d) adventive embryony
18. Hybridoma cells represent
(a) fused malignant myeloma cells with lymphocytes
(b) the canceous cells present in spleen of mouse
(c) fused cytoplasm of myeloma cells and lymphocytes containing nucleus of lymphocyte only
(d) fusion of cells of skin with splenic macrophages
19. Hemolytic jaundice is caused due to a dominant gene but only 10% of the people actually develop the disease. A heterozygous man marries a homozygous normal woman. The proportion of children expected to develop the disease would be
(a) 1/10 (b) 1/20
(c) 1/5 (d) 1/40
20. A sanctuary for bird is housed at ______ and named _______
(a) Gujarat – Gir, Wild-life sanctuary
(b) Rajasthan – Ghana sanctuary
(c) Jammu and
Kashmir – Dachigam snactuary
(d) Madhya
Pradesh – Kanha National Park
21. In which class of the division Bryophyta, the vegetative thallus harbours algal colonies?
(a) Hepaticopsida (b) Musci
(c) Anthocerotopsida (d) both (a) and (c)
22. Sporangium arises from a single superficial cell of the placenta in
(a) Lycopodium (b) Dryopteris
(c) Selaginella (d) Ophioglossum
23. Which of the following alteration of the codon ATTGCC alter the polypetide seriously?
(a) ATTGCA (b) ATAGCG
(c) ATTTGCC (D) ATTCCCGCC
24. A commonnly grown social forestry tree in the recent times is
(a) Azadirachta indica
(b) Eucalyptus regnans
(c) Leucaena leucocephala
(d) Mangifera indica
25. Based on biodiversity the one that is correct in the increasing order is
(a) Insects < crustaceans < birds < molluscs
(b) Birds < crustaceans < molluscs < insects
(c) Crustaceans < insects < birds < molluscs
(d) Molluscs < crustaceans < birds < insects
26. Smoother crops like Sorghum and sunflower
(a) enhance the formation of mycorrhiza around the roots
(b) do not allow the weeds to grow
(c) help in soil binding preventing erosion
(d) remove large quantities of minerals from soil
27. In Batesian mimicry
(a) the viceroy butterfly resembles the monarch butterfly
(b) there occurs aposematic colouration between different unpalatable species
(c) unpalatable vicerory butterfly looks like a palatable species
(d) a common warning pattern to predators is provided by several prey species
28. As per the agreement reached at Kyoto protocol, the countries that have signed the protocol have agreed to reduce greenhouse gas emission by
(a) 10% (b) 7.5%
(c) 5% (d) 25%
29. Cyanide-resistant respiratory pathway
(a) is characteristic of climacteric fruits, several fungi and a few bacteria
(b) produces heat energy when the reduced co-enzymes are oxidized
(c) does not yield ATP
(d) has all of the above features
30. An ascomycetous fungus with sclerotia that are poisonous to livestock but yield an economically important drug is
(a) Neurospora crassa
(b) Pyronema sp.
(c) Erysiphe polygoni
(d) Claviceps purpurea
31. Gills are found in
(a) Agaricus (b) Puccinia
(c) Aspergillus (d) Ustilago
32. When the specific epithet exactly repeats the generic name in binomial nomenclature of an organism (e.g., Malus malus), it is referred as
(a) Homonym (b) Tautonym
(c) Nomennudum (d) Superfluous name
33. A consumer whose carbon atoms have already passed through two trophic levels must be
(a) top carnivore
(b) decomposer
(c) secondary consumer
(d) autotroph
34. The photosynthetic protist that forms an association with crustacean like Daphnia is
(a) Euglypha (b) Zoochlorella
(c) Euglena (d) Tetraspora
35. Which chromosome composition according to C.B. Bridges denotes metamale?
(a) AAA XX (b) AA XY
(c) AAX (d) AAA XY
36. Genes whose products are synthesized only in particular cell types are called
(a) Luxury genes
(b) Jumping genes
(c) Housekeeping genes
(d) Epistatic genes
37. Which among the following is a natural cloning vector?
(a) Bacteriophage M4
(b) Transposable elements of maize
(c) Ti plasmid of Agrobacterium
(d) Ty elements of yeast
38. A plant that transfers the contents of its anther as a single unit during pollination is
(a) Calotropis
(b) Helianthus
(c) Citrus
(d) Hibiscus
39. Food value of which of the following algae is considered to be the highest?
(a) Chlorella (b) Ulva
(c) Chondrus (d) Spirulina
40. How many linkage groups are possible in a human male?
(a) 46 (b) 13
(c) 23 (d) 24
41. The nucleic acid from a microorganism was isolated and the base composition was determined to be
A = 35%, T = 15%, G = 35%, C = 15%.
What would be the physical nature of the nucleic acid?
(a) Double-stranded circular DNA
(b) Single-stranded linear DNA
(c) Double-stranded linear DNA
(d) Single-stranded RNA
42. In Selaginella kraussiana the strobilus is made of
(a) microsporophylls and megasporophylls which are distributed around the axis
(b) a single megasporophyll at the base on one side of the axis and several microsporophylls
(c) microsporophylls and megasporophylls on either side of the axis
(d) only megasporophylls at the lower region and microsporophylls at the apex
43. The expression of transgene directly on the desired phenotype is seen in
(a) hirudin production
(b) toxic Cry protein
(c) productions of ‘Flavr Savr’ tomato
(d) all of the above
44. External water is not required for fertilization even though the male gametes are motile in
(a) Cycas
(b) Selaginella
(c) Dryopteris
(d) Polytrichum
45. A member that belongs to Malvaceae without epicalyx in their flowers is
(a) Hibiscus cannabinus
(b) Gossypium herbaceum
(c) Pavonia zeylanica
(d) Abutilon Indicum
46. One among the following is not a recalcitrant seed. It is
(a) cocoa (b) coffee
(c) coconut (d) pea
47. Dicliny refers to
(a) the condition where stamens and carpels are found in the same flower
(b) the production of male and female flowers on different plants
(c) the phenomenon of production of unisexual flowers
(d) the arrangement of androecium and gynoecium in different directions in a bisexual flower
48. The ploidy of chromosome in the cells of perisperm in paper is _______
(a) n (b) 2n
(c) 4n (d) 3n
49. Double seeded dry dehiscent schizocarp that develops from syncarpous inferior bicarpellary ovary of Umbelliferae is
(a) Carcerule (b) Samara
(c) Regma (d) Cremocarp
50. Collenchyma is seen in
(a) hypodermis of Bambusa stem
(b) petiole of mango
(c) medullary rays of Helianthus
(d) pericycle of bean root.
