Biology Diversity (acellular life/ variety of life) MCQs

151

Biology Diversity (acellular life/ variety of life) MDCAT Test Preparation MCQs

1. The bacteriophage contains an enzyme known as.

a.Dehydrogenase

b.Lysozyme

c.Protease

d.Urease

Question 1 of 56

2. A Virus is a.

a.Viral ribosome

b.Virus

c.Viral gene

d.Viral lysosome

Question 2 of 56

3. What is the sequence of steps in which a bacteriophage attacks bacteria and injects its
DNA?

a.Tail contraction → Landing → DNA Injection Penetration

b.Landing Tail contraction → Penetration → DNA injection

c.Penetration → Landing Tail contraction → DNA injection

d.Landing Penetration Tail contraction → DNA injection

Question 3 of 56

4. Which of the following characteristic of viruses is not like that of living things

a.growth

b.crystal formation

c.reproduction

d.respiration

Question 4 of 56

5. Jenner used material for vaccination from cowpox lesions and successfully vaccinated_____persons:

a.7

b.23

c.16

d.8

Question 5 of 56

6. All viruses can reproduce within living organisms only, so they are known as:

a.Facultative Intracellular Parasites

b.Endoparasites

c.Ectoparasites

d.Obligate Intracellular Parasites

Question 6 of 56

7. HIV attaches to

a.CD4 protein

b.nucleoprotein

c.glycoproten

d.lipoprotein

Question 7 of 56

8. ________ was formerly called as infectious hepatitis:

a.Hepatitis E

b.Hepatitis A

c.Hepatitis C

d.Hepatitis B

Question 8 of 56

9. In HIV viruses, reverse transcriptase converts single-stranded RNA into double stranded viral DNA. This process is called:

a.Replication

b.Translation

c.Reverse Transcriptase

d.Duplication

Question 9 of 56

10. which of the at any in the ot true for retroviruses

a.Retroviruses carry gene for RNA dependent DNA polymerase

b.DNA is not present at any stage in the life cycle of retrovirusess

c.Retroviruses are causative agents for certain kinds of cancer in man

d.The genetic material in mature retroviruses is RNA

Question 10 of 56

11. Which statement is not true about fungi

a.both b and c

b.lack cell wall

c.absorptive heterotrophs

d.eukaryotic reducers

Question 11 of 56

12. Common cold is caused by

a.Adenovirus

b.Polyomavirus

c.Tubulovirus

d.Rhabdovirus

Question 12 of 56

13. AIDS is due to.

a.Deficiency of T4 lymphocytes

b.Bacterial infection

c.High blood pressure

d.Deficiency of riboflavin

Question 13 of 56

14. When a bacteriophage in its lytic phase carries some of the bacterium's partially digested chromosome with it to another host cell the process is called:

a.None of these

b.Transduction

c.Transformation

d.Conjugation

Question 14 of 56

15. Poliomyelitis affects

a.motor neuron

b.sensory neuron

c.muscly

d.brain

Question 15 of 56

16. Mumps and measles viruses belong to group paramyxoviruses which are the viruses:

a.DNA naked

b.RNA non-enveloped

c.RNA enveloped

d.DNA enveloped

Question 16 of 56

17. RNA retroviruses have a special enzyme that

a.disintegrates host DNA

b.transcribe viral RNA to DNA

c.translates host DNA

d.Polymerises host DNA

Question 17 of 56

18. The genetic material of retroviruses (AIDS virus) is.

a.Single stranded RNA

b.Double stranded DNA

c.Single stranded DNA

d.Double stranded RNA

Question 18 of 56

19. Prions are made up of

a.none a, b and c

b.RNA and Lipids only

c.Protein and Nucleic acid only

d.DNA and carbohydrate only

Question 19 of 56

20. Enveloped virus enters into host cells by.

a.Fusion with the plasma membrane of host

b.By phagocytosis

c.By contact with cell receptor and endocytosis

d.Injecting own nucleic inside host cells

Question 20 of 56

21. The process which cannot take place in the absence of virus is

a.Transduction

b.Transformation

c.Conjugation

d.Translocation

Question 21 of 56

22. Viruses are

a.both a and c

b.obligate parasites

c.intracellular parsites

d.facultative parasites

Question 22 of 56

23. Which part of an animal virus is not reproduced in multiple copies?

a.ribosome

b.protein

c.envelope

d.capsid

Question 23 of 56

24. Reverse transcription is used to make DNA copies of:

a.Viral DNA

b.Host DNA

c.Viral RNA

d.Host RNA

Question 24 of 56

25. In a newly discovered virus you might fin

a.RNA

b.DNA and RNA

c.DNA

d.DNA or RNA

Question 25 of 56

26. The best known phages are T phages that Infect:

a.Salmonella typhi

b.Mycoplasmas

c.Escherichia coli

d.Pseudomonas

Question 26 of 56

27. How is HIV transmitted from one person to another?

a.Through the air

b.By insect vector

c.Through body fluids

d.In food

Question 27 of 56

28. Which one of the following cells are mainly infected by HIV?

a.B-memory cells

b.B-plasma cells

c.T-heller lymphocyte

d.T-killer lymphocyte

Question 28 of 56

29. Helicalerontractile sheath occurs in

a.Retroviruses

b.Fungi

c.Bacteriophage

d.Bacteria

Question 29 of 56

30. Bacteriophage consists of or made up of.

a.Carbon and nitrogen

b.Proteins

c.Nucleoproteins

d.DNA

Question 30 of 56

31. How are HIV and AIDS different?

a.HIV contains RNA; AIDS contains DNA

b.HIV reproduces in B cells; AIDS reproduces in T cells

c.AIDS is an opportunistic infection

d.HIV is the virus that causes AIDS, a disease of the immune system

Question 31 of 56

32. Induction is a process in which a viral DNA

a.Detached from bacterial DNA

b.Multiply with bacterial DNA

c.Enters into bacterial cell and attached with bacterial DNA

d.Destroy the bacterial DNA

Question 32 of 56

33. Which of the following illness is caused by a retrovirus?

a.typhoid

b.sleeping sickness

c.malaria

d.AIDS

Question 33 of 56

34. How does a virus cause disease?

a.It takes a cell's nutrients

b.It releases toxic chemicals

c.It destroys healthy body cell

d.By insect vector

Question 34 of 56

35. Which of the following statements is correct

a.DNA is genetic material of some organism

b.Some virus has RNA as genetic material

c.RNA is genetic material of bacteria

d.RNA is genetic material of all virus

Question 35 of 56

36. Which one is true for Pox-viruses?

a.DNA-naked virion

b.DNA-non enveloped

c.DNA-enveloped

d.RNA-enveloped

Question 36 of 56

37. HIV is classified as a retrovirus because its genetic information is carried in.

a.Protein coat

b.DNA

c.DNA instead of RNA

d.RNA instead of DNA

Question 37 of 56

38. Viruses are considered nonliving because

a.connot reproduce independently

b.Do not mutate

c.They do not locomote

d.have nucleic

Question 38 of 56

39. The latest view for the origin of viruses is.

a.These are modified plasmids which are in fact the fragments of the nucleic acids of the host

b.These arose from some bacteria, which had developed a nucleus only

c.These have arisen from nucleic acid and protein found in primitive soup

d.These arose from bacteria as a result of the loss of cell wall ribosome etc.

Question 39 of 56

40. Animal viruses have.

a.DNA and RNA

b.DNA or RNA

c.RNA

d.DNA

Question 40 of 56

41. Hepatitis D is caused by

a.virus

b.bacteria

c.viroids

d.prions

Question 41 of 56

42. The HIV primarily infects

a.plasma cells

b.all white blood cells

c.helper T cells

d.red blood cells

Question 42 of 56

43. All viruses are made up of

a.both a and b

b.Nuclic acid

c.Proteins

d.Protein and DNA

Question 43 of 56

44. Why can't a person with AIDS make antibodies against HIV?

a.HIV mutates too quickly for the body to make antibodies

b.B cells are needed to activate T cells, which make antibodies

c.T cells are needed to activate B cells, which make antibodies

d.B cells are destroyed by HIV

Question 44 of 56

45. Which one of the following diseases caused by enveloped RNA virus and spread in epidemic form?

a.Small pox

b.Herpes simplex

c.Polio

d.Influenza

Question 45 of 56

46. HIV is classified as:

a.Oncovirus

b.Retrovirus

c.Bacteriophage

d.Icosahedral virus

Question 46 of 56

47. Which of these is true statement?

a.new viral ribosomes form after viral DNA enters the cell

b.viruses do not need ribosomes for protein formation

c.viruses carry with them their own ribosome for protein formation

d.viruses use the host ribosomes for their own needs

Question 47 of 56

48. The complete mature and Infectious particle is known as

a.virion

b.pirion

c.both a and c

d.orf virus

Question 48 of 56

49. Certain RNA viruses carry a gene for synthesis of DNA. This enzyme is: an enzyme that uses viral RNA as a template in the

a.Reverse transcriptase

b.RNA polymerase

c.Viral nuclease

d.RNA replicase

Question 49 of 56

50. Number of capsomers present in herpes virus are

a.251

b.161

c.162

d.252

Question 50 of 56

51. Bacteriophage releases lysozyme during.

a.Penetration phase

b.Eclipse phase

c.Absorption phase

d.Maturation phase

Question 51 of 56

52. Give below is the diagram of a bacteriophage. In which one of the options all the four part A,B,C and are correct.

a.Ahead B-sheath C collar D-tail fibers

b.Asheath B-collar C-head D-tail fiber

c. A-tail fibers B-head, C-sheath D-collar

d. A collar B-tail fibers C-head D-shea

Question 52 of 56

53. Viroids differ from viruses in having.

a.Naked DNA molecules only viral genome

b.Naked RNA molecules only

c.Naked DNA packed

d.Satellite RNA packed with viral genome

Question 53 of 56

54. Which step in the lytic cycle follows cell? attachment of virus and release of DNA into the

a.production of lysosome

b.assemblage

c.DNA replication

d.Disintegration of host DNA

Question 54 of 56

55. Which of these are found in all viruses?

a.Protein, carbohydrate, lipids t

b.DNA RNA, and proteins

c.proteins and nucleic acid

d.envelope, nucleic acid, capsid

Question 55 of 56

56. Viral disease that is wide spread and caused by enveloped RNA virus is

a.Small pox

b.Influenza

c.Polio

d.Hepatitis B

Question 56 of 56

151

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