11. A person with ‘AB’ blood group is sometimes called a universal recipient because of the? (UPSC Prelims 1995)
[A] lack of antigen in his blood
[B] lack of antibodies in his blood
[C] lack of both antigens and antibodies in his blood
[D] presence of antibodies in his blood
Show Answer
Correct Answer: B [lack of antibodies in his blood]
Notes:
Type AB is considered the universal recipient, as they have both A and B antigens on their red blood cells, and thus their body does not have antibodies against A or B antigen cells, so they can receive blood from any blood type.
12. How many mutations does Omicron have till the end of 2021?
[A] 13
[B] 18
[C] 25
[D] More than 30
Show Answer
Correct Answer: D [More than 30]
Notes:
Omicron has some deletions and more than 30 mutations, several of which overlap with those in the alpha, beta, gamma, or delta VoCs. These deletions and mutations are known to lead to increased transmissibility, higher viral binding affinity, and higher antibody escape. Some of the other omicron mutations with known effects confer increased transmissibility and affect binding affinity. Although omicron is likely to be highly transmissible, it is not yet clear whether it has greater transmissibility than delta.
13. Which branch of biology is known for the study of internal body structure?
[A] Anatomy
[B] Biometrics
[C] Pathology
[D] None of these
Show Answer
Correct Answer: A [Anatomy]
Notes:
Anatomy is the branch of biology that studies the structure and parts of organisms. Anatomy is a branch of natural science that deals with the structural organization of living things.
14. Which is the largest phylum of Animalia?
[A] Arthropoda
[B] Annelida
[C] Moluska
[D] Aves
Show Answer
Correct Answer: A [Arthropoda]
Notes:
Arthropoda is the largest phylum of animals. In Arthropoda we study in detail about insects.
15. Which of the following can be done in the cultivation of plant viruses?
[A] tissue culture
[B] cultures of separated cells
[C] whole plants
[D] all of these
Show Answer
Correct Answer: D [all of these]
Notes:
The cultivation of plant viruses can be done in tissue culture, cultures of separated cells and whole plants.
16. What are the inclusion bodies of the measles virus?
[A] intracytoplasmic
[B] intranuclear
[C] both (a) and (b)
[D] none of these
Show Answer
Correct Answer: C [both (a) and (b)]
Notes:
The inclusion bodies of the measles virus are intracytoplasmic and intranuclear.
17. Chromatophores participate in which of the following processes?
[A] Photosynthesis
[B] respiration
[C] Development
[D] Speed
Show Answer
Correct Answer: A [Photosynthesis]
Notes:
Chromatophores are one of the members of phototrophic bacteria. They contain bacteriochlorophyll pigments and carotenoids and participate in photosynthesis.
18. Which bacteria do not have a cell wall and are therefore resistant to penicillin?
[A] Cyanobacteria
[B] Mycoplasmas
[C] Bdellovibrios
[D] Spirochetes
Show Answer
Correct Answer: B [Mycoplasmas]
Notes:
Mycoplasma is a genus of bacteria that do not have a cell wall surrounding the cell membrane.
19. Which type of cocci bacteria forms a cluster and irregular pattern?
[A] Staphylococci
[B] Diplococci
[C] Tetracocci
[D] Streptococci
Show Answer
Correct Answer: A [Staphylococci]
Notes:
Staphylococci are the correct answer here. They are known for forming grape-like clusters and irregular patterns. These are gram-positive cocci, or spherical bacteria, that belong to the family Micrococcaceae. Members of the Micrococcaceae family such as Staphylococcus, Micrococcus, and Kocuria, are ubiquitous in nature and are typically harmless, often residing on the skin and mucous membranes of humans and other mammals.
20. Lateral conduction in gymnosperms leaf is done by which of the following?
[A] Veins
[B] Xylem parenchyma
[C] Transfusion tissue
[D] Medullary rays
Show Answer
Correct Answer: C [Transfusion tissue]
Notes:
Lateral conduction in gymnosperms leaf is done by transfusion tissue. In the case of gymnosperms, a single vascular bundle is present in the central vein region of the leaf.
