Biology Diversity (acellular life/ variety of life) MCQs

119

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

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

a.Through the air

b.Through body fluids

c.By insect vector

d.In food

Question 1 of 56

2. 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 2 of 56

3. Animal viruses have.

a.RNA

b.DNA

c.DNA and RNA

d.DNA or RNA

Question 3 of 56

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

a.B cells are destroyed by HIV

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

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

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

Question 4 of 56

5. Which of these is true statement?

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

b.viruses use the host ribosomes for their own needs

c.viruses do not need ribosomes for protein formation

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

Question 5 of 56

6. Bacteriophage consists of or made up of.

a.Nucleoproteins

b.DNA

c.Proteins

d.Carbon and nitrogen

Question 6 of 56

7. HIV is classified as:

a.Retrovirus

b.Icosahedral virus

c.Oncovirus

d.Bacteriophage

Question 7 of 56

8. The complete mature and Infectious particle is known as

a.both a and c

b.orf virus

c.pirion

d.virion

Question 8 of 56

9. Viroids differ from viruses in having.

a.Satellite RNA packed with viral genome

b.Naked DNA packed

c.Naked DNA molecules only viral genome

d.Naked RNA molecules only

Question 9 of 56

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

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

b.The genetic material in mature retroviruses is RNA

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

d.Retroviruses carry gene for RNA dependent DNA polymerase

Question 10 of 56

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

a.Conjugation

b.Transformation

c.Transduction

d.Translocation

Question 11 of 56

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

a.B-memory cells

b.T-heller lymphocyte

c.T-killer lymphocyte

d.B-plasma cells

Question 12 of 56

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

a.assemblage

b.production of lysosome

c.DNA replication

d.Disintegration of host DNA

Question 13 of 56

14. Viruses are

a.both a and c

b.obligate parasites

c.facultative parasites

d.intracellular parsites

Question 14 of 56

15. How are HIV and AIDS different?

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

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

c.AIDS is an opportunistic infection

d.HIV contains RNA; AIDS contains DNA

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.DNA enveloped

d.RNA enveloped

Question 16 of 56

17. Number of capsomers present in herpes virus are

a.251

b.162

c.252

d.161

Question 17 of 56

18. Hepatitis D is caused by

a.bacteria

b.virus

c.viroids

d.prions

Question 18 of 56

19. HIV attaches to

a.glycoproten

b.CD4 protein

c.lipoprotein

d.nucleoprotein

Question 19 of 56

20. RNA retroviruses have a special enzyme that

a.Polymerises host DNA

b.transcribe viral RNA to DNA

c.disintegrates host DNA

d.translates host DNA

Question 20 of 56

21. 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.Reverse transcriptase

c.Viral nuclease

d.RNA polymerase

Question 21 of 56

22. Which statement is not true about fungi

a.absorptive heterotrophs

b.eukaryotic reducers

c.lack cell wall

d.both b and c

Question 22 of 56

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

a.Herpes simplex

b.Small pox

c.Influenza

d.Polio

Question 23 of 56

24. Viruses are considered nonliving because

a.Do not mutate

b.connot reproduce independently

c.have nucleic

d.They do not locomote

Question 24 of 56

25. Bacteriophage releases lysozyme during.

a.Absorption phase

b.Eclipse phase

c.Penetration phase

d.Maturation phase

Question 25 of 56

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

a.Single stranded RNA

b.Single stranded DNA

c.Double stranded RNA

d.Double stranded DNA

Question 26 of 56

27. All viruses are made up of

a.Proteins

b.both a and b

c.Nuclic acid

d.Protein and DNA

Question 27 of 56

28. Poliomyelitis affects

a.brain

b.sensory neuron

c.muscly

d.motor neuron

Question 28 of 56

29. ________ was formerly called as infectious hepatitis:

a.Hepatitis E

b.Hepatitis C

c.Hepatitis B

d.Hepatitis A

Question 29 of 56

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

a.8

b.16

c.7

d.23

Question 30 of 56

31. Prions are made up of

a.RNA and Lipids only

b.Protein and Nucleic acid only

c.none a, b and c

d.DNA and carbohydrate only

Question 31 of 56

32. In a newly discovered virus you might fin

a.DNA and RNA

b.DNA or RNA

c.DNA

d.RNA

Question 32 of 56

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

a.malaria

b.sleeping sickness

c.AIDS

d.typhoid

Question 33 of 56

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

a.Influenza

b.Polio

c.Hepatitis B

d.Small pox

Question 34 of 56

35. 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 35 of 56

36. Induction is a process in which a viral DNA

a.Destroy the bacterial DNA

b.Enters into bacterial cell and attached with bacterial DNA

c.Detached from bacterial DNA

d.Multiply with bacterial DNA

Question 36 of 56

37. The HIV primarily infects

a.all white blood cells

b.helper T cells

c.plasma cells

d.red blood cells

Question 37 of 56

38. Which of the following statements is correct

a.DNA is genetic material of some organism

b.RNA is genetic material of all virus

c.Some virus has RNA as genetic material

d.RNA is genetic material of bacteria

Question 38 of 56

39. A Virus is a.

a.Virus

b.Viral lysosome

c.Viral ribosome

d.Viral gene

Question 39 of 56

40. Which one is true for Pox-viruses?

a.RNA-enveloped

b.DNA-non enveloped

c.DNA-naked virion

d.DNA-enveloped

Question 40 of 56

41. Which of these are found in all viruses?

a.DNA RNA, and proteins

b.envelope, nucleic acid, capsid

c.proteins and nucleic acid

d.Protein, carbohydrate, lipids t

Question 41 of 56

42. 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.Conjugation

c.Transformation

d.None of these

Question 42 of 56

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

a.DNA

b.RNA instead of DNA

c.Protein coat

d.DNA instead of RNA

Question 43 of 56

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

a.capsid

b.ribosome

c.envelope

d.protein

Question 44 of 56

45. 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 45 of 56

46. 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 46 of 56

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

a.Salmonella typhi

b.Pseudomonas

c.Mycoplasmas

d.Escherichia coli

Question 47 of 56

48. Helicalerontractile sheath occurs in

a.Bacteriophage

b.Fungi

c.Retroviruses

d.Bacteria

Question 48 of 56

49. The bacteriophage contains an enzyme known as.

a.Dehydrogenase

b.Urease

c.Lysozyme

d.Protease

Question 49 of 56

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

a.Viral RNA

b.Host DNA

c.Viral DNA

d.Host RNA

Question 50 of 56

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

a.crystal formation

b.growth

c.reproduction

d.respiration

Question 51 of 56

52. AIDS is due to.

a.Deficiency of riboflavin

b.High blood pressure

c.Deficiency of T4 lymphocytes

d.Bacterial infection

Question 52 of 56

53. Enveloped virus enters into host cells by.

a.Fusion with the plasma membrane of host

b.Injecting own nucleic inside host cells

c.By contact with cell receptor and endocytosis

d.By phagocytosis

Question 53 of 56

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

a.Obligate Intracellular Parasites

b.Endoparasites

c.Facultative Intracellular Parasites

d.Ectoparasites

Question 54 of 56

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

a.Reverse Transcriptase

b.Duplication

c.Translation

d.Replication

Question 55 of 56

56. Common cold is caused by

a.Adenovirus

b.Rhabdovirus

c.Polyomavirus

d.Tubulovirus

Question 56 of 56

119

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