Biology Diversity (acellular life/ variety of life) MCQs

172

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

1. Viruses are considered nonliving because

a.They do not locomote

b.connot reproduce independently

c.Do not mutate

d.have nucleic

Question 1 of 56

2. In a newly discovered virus you might fin

a.DNA and RNA

b.DNA

c.DNA or RNA

d.RNA

Question 2 of 56

3. Bacteriophage releases lysozyme during.

a.Maturation phase

b.Absorption phase

c.Penetration phase

d.Eclipse phase

Question 3 of 56

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

a.respiration

b.reproduction

c.growth

d.crystal formation

Question 4 of 56

5. 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 5 of 56

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

a.RNA non-enveloped

b.RNA enveloped

c.DNA enveloped

d.DNA naked

Question 6 of 56

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

a.RNA instead of DNA

b.DNA

c.Protein coat

d.DNA instead of RNA

Question 7 of 56

8. 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.HIV contains RNA; AIDS contains DNA

d.AIDS is an opportunistic infection

Question 8 of 56

9. Which of the following statements is correct

a.RNA is genetic material of all virus

b.Some virus has RNA as genetic material

c.DNA is genetic material of some organism

d.RNA is genetic material of bacteria

Question 9 of 56

10. The complete mature and Infectious particle is known as

a.virion

b.pirion

c.both a and c

d.orf virus

Question 10 of 56

11. Helicalerontractile sheath occurs in

a.Bacteria

b.Fungi

c.Bacteriophage

d.Retroviruses

Question 11 of 56

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

a.Pseudomonas

b.Salmonella typhi

c.Mycoplasmas

d.Escherichia coli

Question 12 of 56

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

a.Small pox

b.Influenza

c.Polio

d.Hepatitis B

Question 13 of 56

14. Which of these is true statement?

a.viruses use the host ribosomes for their own needs

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

c.viruses do not need ribosomes for protein formation

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

Question 14 of 56

15. Poliomyelitis affects

a.motor neuron

b.muscly

c.brain

d.sensory neuron

Question 15 of 56

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

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

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

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

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

Question 16 of 56

17. Common cold is caused by

a.Adenovirus

b.Rhabdovirus

c.Polyomavirus

d.Tubulovirus

Question 17 of 56

18. 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 18 of 56

19. Bacteriophage consists of or made up of.

a.DNA

b.Carbon and nitrogen

c.Proteins

d.Nucleoproteins

Question 19 of 56

20. The HIV primarily infects

a.red blood cells

b.plasma cells

c.helper T cells

d.all white blood cells

Question 20 of 56

21. AIDS is due to.

a.High blood pressure

b.Deficiency of T4 lymphocytes

c.Bacterial infection

d.Deficiency of riboflavin

Question 21 of 56

22. HIV attaches to

a.nucleoprotein

b.glycoproten

c.CD4 protein

d.lipoprotein

Question 22 of 56

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

a.Retroviruses carry gene for RNA dependent DNA polymerase

b.The genetic material in mature retroviruses is RNA

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

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

Question 23 of 56

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

a.B-memory cells

b.T-killer lymphocyte

c.B-plasma cells

d.T-heller lymphocyte

Question 24 of 56

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

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

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

c.B cells are destroyed by HIV

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

Question 25 of 56

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

a.sleeping sickness

b.typhoid

c.AIDS

d.malaria

Question 26 of 56

27. 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 27 of 56

28. HIV is classified as:

a.Oncovirus

b.Icosahedral virus

c.Retrovirus

d.Bacteriophage

Question 28 of 56

29. Viruses are

a.both a and c

b.intracellular parsites

c.obligate parasites

d.facultative parasites

Question 29 of 56

30. A Virus is a.

a.Viral ribosome

b.Viral lysosome

c.Viral gene

d.Virus

Question 30 of 56

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

a.Tail contraction → Landing → DNA Injection Penetration

b.Penetration → Landing Tail contraction → DNA injection

c.Landing Tail contraction → Penetration → DNA injection

d.Landing Penetration Tail contraction → DNA injection

Question 31 of 56

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

a.Translation

b.Duplication

c.Replication

d.Reverse Transcriptase

Question 32 of 56

33. Induction is a process in which a viral DNA

a.Enters into bacterial cell and attached with bacterial DNA

b.Destroy the bacterial DNA

c.Detached from bacterial DNA

d.Multiply with bacterial DNA

Question 33 of 56

34. RNA retroviruses have a special enzyme that

a.Polymerises host DNA

b.transcribe viral RNA to DNA

c.translates host DNA

d.disintegrates host DNA

Question 34 of 56

35. 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 35 of 56

36. All viruses are made up of

a.Proteins

b.Protein and DNA

c.Nuclic acid

d.both a and b

Question 36 of 56

37. Prions are made up of

a.DNA and carbohydrate only

b.Protein and Nucleic acid only

c.none a, b and c

d.RNA and Lipids only

Question 37 of 56

38. Animal viruses have.

a.DNA

b.DNA or RNA

c.RNA

d.DNA and RNA

Question 38 of 56

39. How does a virus cause disease?

a.It destroys healthy body cell

b.It takes a cell's nutrients

c.By insect vector

d.It releases toxic chemicals

Question 39 of 56

40. Viroids differ from viruses in having.

a.Naked DNA packed

b.Naked DNA molecules only viral genome

c.Satellite RNA packed with viral genome

d.Naked RNA molecules only

Question 40 of 56

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

a.Viral RNA

b.Viral DNA

c.Host DNA

d.Host RNA

Question 41 of 56

42. The bacteriophage contains an enzyme known as.

a.Dehydrogenase

b.Protease

c.Urease

d.Lysozyme

Question 42 of 56

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

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

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

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

Question 43 of 56

44. Which one is true for Pox-viruses?

a.DNA-enveloped

b.DNA-non enveloped

c.RNA-enveloped

d.DNA-naked virion

Question 44 of 56

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

a.ribosome

b.capsid

c.protein

d.envelope

Question 45 of 56

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

a.Double stranded RNA

b.Double stranded DNA

c.Single stranded RNA

d.Single stranded DNA

Question 46 of 56

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

a.Translocation

b.Transformation

c.Conjugation

d.Transduction

Question 47 of 56

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

a.Obligate Intracellular Parasites

b.Endoparasites

c.Ectoparasites

d.Facultative Intracellular Parasites

Question 48 of 56

49. Which statement is not true about fungi

a.absorptive heterotrophs

b.lack cell wall

c.eukaryotic reducers

d.both b and c

Question 49 of 56

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

a.Through body fluids

b.By insect vector

c.In food

d.Through the air

Question 50 of 56

51. Number of capsomers present in herpes virus are

a.252

b.162

c.251

d.161

Question 51 of 56

52. 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.RNA replicase

d.Viral nuclease

Question 52 of 56

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

a.23

b.7

c.16

d.8

Question 53 of 56

54. Hepatitis D is caused by

a.prions

b.viroids

c.bacteria

d.virus

Question 54 of 56

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

a.Influenza

b.Small pox

c.Herpes simplex

d.Polio

Question 55 of 56

56. ________ was formerly called as infectious hepatitis:

a.Hepatitis A

b.Hepatitis B

c.Hepatitis E

d.Hepatitis C

Question 56 of 56

172

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