Biology Diversity (acellular life/ variety of life) MCQs

157

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

1. 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.Transduction

b.None of these

c.Transformation

d.Conjugation

Question 1 of 56

2. The bacteriophage contains an enzyme known as.

a.Lysozyme

b.Protease

c.Dehydrogenase

d.Urease

Question 2 of 56

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

a.envelope

b.protein

c.capsid

d.ribosome

Question 3 of 56

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

a.Escherichia coli

b.Pseudomonas

c.Mycoplasmas

d.Salmonella typhi

Question 4 of 56

5. Which statement is not true about fungi

a.absorptive heterotrophs

b.lack cell wall

c.both b and c

d.eukaryotic reducers

Question 5 of 56

6. The HIV primarily infects

a.helper T cells

b.red blood cells

c.plasma cells

d.all white blood cells

Question 6 of 56

7. A Virus is a.

a.Viral gene

b.Viral lysosome

c.Viral ribosome

d.Virus

Question 7 of 56

8. Animal viruses have.

a.DNA

b.DNA or RNA

c.DNA and RNA

d.RNA

Question 8 of 56

9. How does a virus cause disease?

a.It takes a cell's nutrients

b.It releases toxic chemicals

c.By insect vector

d.It destroys healthy body cell

Question 9 of 56

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

a.RNA instead of DNA

b.Protein coat

c.DNA instead of RNA

d.DNA

Question 10 of 56

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

a.Translocation

b.Conjugation

c.Transformation

d.Transduction

Question 11 of 56

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

a.7

b.8

c.23

d.16

Question 12 of 56

13. Prions are made up of

a.DNA and carbohydrate only

b.none a, b and c

c.Protein and Nucleic acid only

d.RNA and Lipids only

Question 13 of 56

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

a.respiration

b.growth

c.reproduction

d.crystal formation

Question 14 of 56

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

a.DNA enveloped

b.RNA enveloped

c.RNA non-enveloped

d.DNA naked

Question 15 of 56

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

a.Small pox

b.Polio

c.Hepatitis B

d.Influenza

Question 16 of 56

17. 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 17 of 56

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

a.Influenza

b.Polio

c.Small pox

d.Herpes simplex

Question 18 of 56

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

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

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

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 19 of 56

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

a.production of lysosome

b.Disintegration of host DNA

c.DNA replication

d.assemblage

Question 20 of 56

21. Bacteriophage consists of or made up of.

a.Carbon and nitrogen

b.Proteins

c.Nucleoproteins

d.DNA

Question 21 of 56

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

a.Viral RNA

b.Host RNA

c.Host DNA

d.Viral DNA

Question 22 of 56

23. Poliomyelitis affects

a.sensory neuron

b.brain

c.motor neuron

d.muscly

Question 23 of 56

24. All viruses are made up of

a.Nuclic acid

b.both a and b

c.Proteins

d.Protein and DNA

Question 24 of 56

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

a.Double stranded DNA

b.Single stranded RNA

c.Single stranded DNA

d.Double stranded RNA

Question 25 of 56

26. Hepatitis D is caused by

a.virus

b.viroids

c.bacteria

d.prions

Question 26 of 56

27. Enveloped virus enters into host cells by.

a.Injecting own nucleic inside host cells

b.By contact with cell receptor and endocytosis

c.Fusion with the plasma membrane of host

d.By phagocytosis

Question 27 of 56

28. Common cold is caused by

a.Polyomavirus

b.Adenovirus

c.Rhabdovirus

d.Tubulovirus

Question 28 of 56

29. Induction is a process in which a viral DNA

a.Destroy the bacterial DNA

b.Detached from bacterial DNA

c.Multiply with bacterial DNA

d.Enters into bacterial cell and attached with bacterial DNA

Question 29 of 56

30. HIV attaches to

a.glycoproten

b.lipoprotein

c.CD4 protein

d.nucleoprotein

Question 30 of 56

31. The complete mature and Infectious particle is known as

a.pirion

b.virion

c.both a and c

d.orf virus

Question 31 of 56

32. Number of capsomers present in herpes virus are

a.162

b.251

c.252

d.161

Question 32 of 56

33. Viruses are

a.both a and c

b.facultative parasites

c.obligate parasites

d.intracellular parsites

Question 33 of 56

34. Viruses are considered nonliving because

a.Do not mutate

b.They do not locomote

c.connot reproduce independently

d.have nucleic

Question 34 of 56

35. Which of these are found in all viruses?

a.proteins and nucleic acid

b.envelope, nucleic acid, capsid

c.DNA RNA, and proteins

d.Protein, carbohydrate, lipids t

Question 35 of 56

36. Helicalerontractile sheath occurs in

a.Fungi

b.Retroviruses

c.Bacteriophage

d.Bacteria

Question 36 of 56

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

a.Reverse Transcriptase

b.Replication

c.Translation

d.Duplication

Question 37 of 56

38. Which one is true for Pox-viruses?

a.DNA-enveloped

b.DNA-non enveloped

c.RNA-enveloped

d.DNA-naked virion

Question 38 of 56

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

a.AIDS

b.malaria

c.typhoid

d.sleeping sickness

Question 39 of 56

40. 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 replicase

b.RNA polymerase

c.Viral nuclease

d.Reverse transcriptase

Question 40 of 56

41. HIV is classified as:

a.Bacteriophage

b.Oncovirus

c.Icosahedral virus

d.Retrovirus

Question 41 of 56

42. Bacteriophage releases lysozyme during.

a.Absorption phase

b.Eclipse phase

c.Penetration phase

d.Maturation phase

Question 42 of 56

43. RNA retroviruses have a special enzyme that

a.transcribe viral RNA to DNA

b.Polymerises host DNA

c.translates host DNA

d.disintegrates host DNA

Question 43 of 56

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

a.The genetic material in mature retroviruses is RNA

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

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

d.Retroviruses carry gene for RNA dependent DNA polymerase

Question 44 of 56

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

a.B-plasma cells

b.T-heller lymphocyte

c.B-memory cells

d.T-killer lymphocyte

Question 45 of 56

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

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

b.B cells are destroyed by HIV

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

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

Question 46 of 56

47. Which of these is true statement?

a.viruses use the host ribosomes for their own needs

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

c.viruses do not need ribosomes for protein formation

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

Question 47 of 56

48. 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 48 of 56

49. 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.Landing Penetration Tail contraction → DNA injection

d.Penetration → Landing Tail contraction → DNA injection

Question 49 of 56

50. AIDS is due to.

a.Bacterial infection

b.High blood pressure

c.Deficiency of riboflavin

d.Deficiency of T4 lymphocytes

Question 50 of 56

51. 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 51 of 56

52. Which of the following statements is correct

a.RNA is genetic material of all virus

b.RNA is genetic material of bacteria

c.DNA is genetic material of some organism

d.Some virus has RNA as genetic material

Question 52 of 56

53. ________ was formerly called as infectious hepatitis:

a.Hepatitis C

b.Hepatitis B

c.Hepatitis E

d.Hepatitis A

Question 53 of 56

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

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

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

Question 54 of 56

55. In a newly discovered virus you might fin

a.DNA or RNA

b.RNA

c.DNA

d.DNA and RNA

Question 55 of 56

56. Viroids differ from viruses in having.

a.Naked DNA packed

b.Naked RNA molecules only

c.Naked DNA molecules only viral genome

d.Satellite RNA packed with viral genome

Question 56 of 56

157

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