Biology Diversity (acellular life/ variety of life) MCQs

170

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

1. Which one is true for Pox-viruses?

a.DNA-enveloped

b.RNA-enveloped

c.DNA-non enveloped

d.DNA-naked virion

Question 1 of 56

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

a.Herpes simplex

b.Polio

c.Small pox

d.Influenza

Question 2 of 56

3. HIV attaches to

a.glycoproten

b.nucleoprotein

c.CD4 protein

d.lipoprotein

Question 3 of 56

4. Hepatitis D is caused by

a.bacteria

b.prions

c.viroids

d.virus

Question 4 of 56

5. Poliomyelitis affects

a.brain

b.motor neuron

c.muscly

d.sensory neuron

Question 5 of 56

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

a.B cells are destroyed by HIV

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

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

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

Question 6 of 56

7. Animal viruses have.

a.DNA and RNA

b.RNA

c.DNA or RNA

d.DNA

Question 7 of 56

8. HIV is classified as:

a.Icosahedral virus

b.Oncovirus

c.Retrovirus

d.Bacteriophage

Question 8 of 56

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

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

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

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

Question 9 of 56

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

a.Host RNA

b.Viral RNA

c.Host DNA

d.Viral DNA

Question 10 of 56

11. Bacteriophage releases lysozyme during.

a.Penetration phase

b.Eclipse phase

c.Absorption phase

d.Maturation phase

Question 11 of 56

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

a.T-killer lymphocyte

b.B-plasma cells

c.B-memory cells

d.T-heller lymphocyte

Question 12 of 56

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

a.DNA

b.Protein coat

c.DNA instead of RNA

d.RNA instead of DNA

Question 13 of 56

14. Which statement is not true about fungi

a.lack cell wall

b.eukaryotic reducers

c.both b and c

d.absorptive heterotrophs

Question 14 of 56

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

a.Single stranded DNA

b.Single stranded RNA

c.Double stranded RNA

d.Double stranded DNA

Question 15 of 56

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

a.protein

b.capsid

c.ribosome

d.envelope

Question 16 of 56

17. 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 17 of 56

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

a.23

b.8

c.7

d.16

Question 18 of 56

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

a.typhoid

b.sleeping sickness

c.AIDS

d.malaria

Question 19 of 56

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

a.Penetration → Landing Tail contraction → DNA injection

b.Landing Penetration Tail contraction → DNA injection

c.Tail contraction → Landing → DNA Injection Penetration

d.Landing Tail contraction → Penetration → DNA injection

Question 20 of 56

21. Helicalerontractile sheath occurs in

a.Bacteria

b.Bacteriophage

c.Fungi

d.Retroviruses

Question 21 of 56

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

a.Transduction

b.Conjugation

c.Transformation

d.Translocation

Question 22 of 56

23. Induction is a process in which a viral DNA

a.Multiply with bacterial DNA

b.Enters into bacterial cell and attached with bacterial DNA

c.Detached from bacterial DNA

d.Destroy the bacterial DNA

Question 23 of 56

24. Viroids differ from viruses in having.

a.Satellite RNA packed with viral genome

b.Naked DNA packed

c.Naked RNA molecules only

d.Naked DNA molecules only viral genome

Question 24 of 56

25. The HIV primarily infects

a.all white blood cells

b.helper T cells

c.red blood cells

d.plasma cells

Question 25 of 56

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

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

b.Retroviruses carry gene for RNA dependent DNA polymerase

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

d.The genetic material in mature retroviruses is RNA

Question 26 of 56

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

a.Disintegration of host DNA

b.assemblage

c.DNA replication

d.production of lysosome

Question 27 of 56

28. AIDS is due to.

a.Deficiency of riboflavin

b.Deficiency of T4 lymphocytes

c.Bacterial infection

d.High blood pressure

Question 28 of 56

29. Viruses are considered nonliving because

a.connot reproduce independently

b.They do not locomote

c.Do not mutate

d.have nucleic

Question 29 of 56

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

a.Reverse Transcriptase

b.Duplication

c.Replication

d.Translation

Question 30 of 56

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

a.Escherichia coli

b.Mycoplasmas

c.Salmonella typhi

d.Pseudomonas

Question 31 of 56

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

a.Obligate Intracellular Parasites

b.Facultative Intracellular Parasites

c.Endoparasites

d.Ectoparasites

Question 32 of 56

33. Enveloped virus enters into host cells by.

a.Injecting own nucleic inside host cells

b.Fusion with the plasma membrane of host

c.By contact with cell receptor and endocytosis

d.By phagocytosis

Question 33 of 56

34. In a newly discovered virus you might fin

a.RNA

b.DNA

c.DNA or RNA

d.DNA and RNA

Question 34 of 56

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

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

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

Question 35 of 56

36. Common cold is caused by

a.Adenovirus

b.Rhabdovirus

c.Tubulovirus

d.Polyomavirus

Question 36 of 56

37. A Virus is a.

a.Virus

b.Viral lysosome

c.Viral gene

d.Viral ribosome

Question 37 of 56

38. How are HIV and AIDS different?

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

b.HIV contains RNA; AIDS contains DNA

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

d.AIDS is an opportunistic infection

Question 38 of 56

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

a.Influenza

b.Polio

c.Hepatitis B

d.Small pox

Question 39 of 56

40. 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.Transformation

c.Conjugation

d.Transduction

Question 40 of 56

41. The bacteriophage contains an enzyme known as.

a.Lysozyme

b.Protease

c.Urease

d.Dehydrogenase

Question 41 of 56

42. ________ was formerly called as infectious hepatitis:

a.Hepatitis A

b.Hepatitis E

c.Hepatitis B

d.Hepatitis C

Question 42 of 56

43. Which of these is true statement?

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

b.viruses do not need ribosomes for protein formation

c.viruses use the host ribosomes for their own needs

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

Question 43 of 56

44. How does a virus cause disease?

a.It takes a cell's nutrients

b.It destroys healthy body cell

c.It releases toxic chemicals

d.By insect vector

Question 44 of 56

45. Prions are made up of

a.RNA and Lipids only

b.none a, b and c

c.DNA and carbohydrate only

d.Protein and Nucleic acid only

Question 45 of 56

46. Which of these are found in all viruses?

a.proteins and nucleic acid

b.Protein, carbohydrate, lipids t

c.DNA RNA, and proteins

d.envelope, nucleic acid, capsid

Question 46 of 56

47. The complete mature and Infectious particle is known as

a.orf virus

b.virion

c.pirion

d.both a and c

Question 47 of 56

48. All viruses are made up of

a.Nuclic acid

b.Proteins

c.both a and b

d.Protein and DNA

Question 48 of 56

49. Number of capsomers present in herpes virus are

a.162

b.161

c.252

d.251

Question 49 of 56

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

a.By insect vector

b.In food

c.Through body fluids

d.Through the air

Question 50 of 56

51. 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.RNA polymerase

b.RNA replicase

c.Reverse transcriptase

d.Viral nuclease

Question 51 of 56

52. Which of the following statements is correct

a.Some virus has RNA as genetic material

b.RNA is genetic material of bacteria

c.RNA is genetic material of all virus

d.DNA is genetic material of some organism

Question 52 of 56

53. Viruses are

a.facultative parasites

b.intracellular parsites

c.both a and c

d.obligate parasites

Question 53 of 56

54. RNA retroviruses have a special enzyme that

a.transcribe viral RNA to DNA

b.translates host DNA

c.disintegrates host DNA

d.Polymerises host DNA

Question 54 of 56

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

a.respiration

b.crystal formation

c.growth

d.reproduction

Question 55 of 56

56. Bacteriophage consists of or made up of.

a.Nucleoproteins

b.DNA

c.Proteins

d.Carbon and nitrogen

Question 56 of 56

170

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