41. Assertion (A): Allopolyploidy among animals is extremely rare.
Reason ( R) : Allopolyploidy involves the condition of chromosomes sets from different species and the reproductive barriers between animal species typically prevent the occurrence of allopolyploid individuals.
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is not the correct explanation of A
C) A is true, but R is false
D) R is true, but A is false
42. What is the significance of telomerase in relation to aging and cellular senescence?
A) Telomerase accelerates aging by promoting cell division
B) Telomerase prevents aging by repairing cellular damage
C) Telomerase has no impact on aging process
D) Telomerase helps maintain telomere length, slowing down the aging process
43. The primary function of desmosomes in cells is to:
A) Provide structural support and mechanical strength by anchoring adjacent cells together
B) Facilitate communication and exchange of molecules between neighboring cells
C) Generate and conduct electrical impulses in excitable cells
D) Regulate the passage of ions and small molecules across the cell membrane
44. Identify the wrong statements:
1. Aneuploidy is caused due to non-disjunction
2. Primary non-disjunction occurs during first meiotic division
3. Secondary non-disjunction occurs during second meiotic division.
4. Autopolyploids mostly exhibit exaggerations of characteristics already prevailing among diploid individuals.
A) 1 & 2 only B) 2 & 3 only C) 3 &4 only D) None of these
45. Which of the following represents nullisomic condition?
A) 2n-1 B) 2n-2 C) 2n+1 D) 2n+2
46. Microsatellites, also known as short tandem repeats (STRs), are:
A) Short sequences of DNA that are repeated in tandem and vary in the number of repeats among individuals
B) Highly conserved sequences of DNA that are present in multiple copies in the genome
C) Regions of the genome that contain polymorphic single nucleotide variations
D) Sequences of DNA that are located at the ends of linear chromosomes
47. In garden pea plant tall is dominant over dwarf and yellow seed is dominant over green seed. A heterozygous tall, yellow seeded plant is self-crossed and 80 seeds were obtained. How many of them would be tall -yellow seeded?
A) 16 B) 5 C) 45 D) 15
48. A phase contrast microscope:
A) Enhances contrast of transparent specimens by exploiting differences in refractive index
B) Relies on staining techniques to highlight specific structures within the specimen
C) Uses fluorescent labels to visualize cellular components
D) Produces 3D images of the surface of objects
49. Which of the following is an example of a point mutation?
A) Deletion of an entire chromosome
B) Duplication of a chromosomal segment
C) Substitution of one nucleotide for another
D) Inversion of a chromosome segment.
50. Random Amplified Polymorphic DNA (RAPD) analysis is based on variations in the:
A) Length of DNA fragments produced by different restriction enzymes
B) Sequence of DNA fragments produced by PCR amplification using random primers
C) Mobility of DNA fragments in a gel matrix
D) Hybridization efficiency of DNA fragments
51. Which of the following is a tool provided by NCBI for searching and retrieving information from various biological databases?
A) PDB
B) Swiss-PROT
C) Entrez
D) GenBank
52. Match the following:
List I List II
a. Ernst Haeckel 1. Two kingdom system
b. Carolus Linnaeus 2. Three kingdom system
c. Robert Whittaker 3. Four kingdom system
d. Herbert F. Copeland 4. Five kingdom system
A) a-2, b-1, c-4, d-3
B) a-3, b-2, c-4, d-1
C) a-2, b-3, c-1, d-4
D) a-1, b-3, c-2, d-4
53. Cladistics is an approach to biological classification in which organisms are categorized in groups based on:
A) morphological similarities
B) most recent common ancestry
C) the number of common characters
D) the anatomical resemblances
54. According to International Code of Zoological Nomenclature scientific naming should avoid:
A) Principle of priority
B) Homonymy
C) Preservation of well-established names
D) None of these
55. Identify the feature present in some prokaryotes, but absent in eukaryotes:
A) Peptidoglycan cell wall
B) Plasma membrane
C) Mitochondria
D) Centrioles
56. Biradial symmetry is exhibited by:
A) Ctenophora B) Crustacea C) Cetacea D) Cephalopoda
57. Identify the group coming under sub-kingdom Parazoa:
A) Ctenophora
B) Rotifera
C) Placozoa
D) Mesozoa
58. In flat worms like Planaria excretion is performed by:
A) Flame cells
B) Green gland
C) Nephridia
D) Contractile vacuole
59. Radula is a horny, ribbon like structure used for scraping or cutting food,found in the
mouths of all mollusks except:
A) Gastropods B) Bivalves C) Scaphopods D) Cephalopods
60. Pedicellariae are:
A) small active tubular projections of Echinoderms having role in locomotion, feeding, and respiration
B) fleshy, paddle like segmented appendages of polychaete worms
C) pincer like structures of Echinoderms used in defense and in the removal of unwanted particles from the body
D) adhesive cytoplasmic organelle of ciliate protozoans
Answers:
41-B | 42-D | 43-A | 44-D | 45-B | 46-A | 47-C | 48-A | 49-C | 50-B |
51-C | 52-A | 53-B | 54-B | 55-A | 56-A | 57-C | 58-A | 59-B | 60-C |