Biology Diversity (acellular life/ variety of life) MCQs

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

1. How are HIV and AIDS different?

a.AIDS is an opportunistic infection

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

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

d.HIV contains RNA; AIDS contains DNA

Question 1 of 56

2. A Virus is a.

a.Viral ribosome

b.Viral lysosome

c.Viral gene

d.Virus

Question 2 of 56

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

a.Host DNA

b.Viral DNA

c.Host RNA

d.Viral RNA

Question 3 of 56

4. Number of capsomers present in herpes virus are

a.251

b.161

c.162

d.252

Question 4 of 56

5. Which statement is not true about fungi

a.eukaryotic reducers

b.absorptive heterotrophs

c.both b and c

d.lack cell wall

Question 5 of 56

6. How does a virus cause disease?

a.By insect vector

b.It takes a cell's nutrients

c.It releases toxic chemicals

d.It destroys healthy body cell

Question 6 of 56

7. Which of these is true statement?

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

b.viruses use the host ribosomes for their own needs

c.viruses do not need ribosomes for protein formation

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

Question 7 of 56

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

a.T-killer lymphocyte

b.T-heller lymphocyte

c.B-plasma cells

d.B-memory cells

Question 8 of 56

9. 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.Viral nuclease

b.RNA polymerase

c.Reverse transcriptase

d.RNA replicase

Question 9 of 56

10. Viruses are

a.facultative parasites

b.obligate parasites

c.both a and c

d.intracellular parsites

Question 10 of 56

11. Viruses are considered nonliving because

a.They do not locomote

b.connot reproduce independently

c.Do not mutate

d.have nucleic

Question 11 of 56

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

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

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

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

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

Question 12 of 56

13. The HIV primarily infects

a.plasma cells

b.all white blood cells

c.helper T cells

d.red blood cells

Question 13 of 56

14. HIV is classified as:

a.Bacteriophage

b.Icosahedral virus

c.Oncovirus

d.Retrovirus

Question 14 of 56

15. Common cold is caused by

a.Rhabdovirus

b.Tubulovirus

c.Adenovirus

d.Polyomavirus

Question 15 of 56

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

a.Duplication

b.Translation

c.Replication

d.Reverse Transcriptase

Question 16 of 56

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

a.Small pox

b.Hepatitis B

c.Polio

d.Influenza

Question 17 of 56

18. All viruses are made up of

a.Proteins

b.Protein and DNA

c.Nuclic acid

d.both a and b

Question 18 of 56

19. 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 19 of 56

20. 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 20 of 56

21. 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 21 of 56

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

a.Double stranded RNA

b.Single stranded DNA

c.Single stranded RNA

d.Double stranded DNA

Question 22 of 56

23. The bacteriophage contains an enzyme known as.

a.Lysozyme

b.Dehydrogenase

c.Protease

d.Urease

Question 23 of 56

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

a.23

b.16

c.8

d.7

Question 24 of 56

25. The complete mature and Infectious particle is known as

a.orf virus

b.virion

c.pirion

d.both a and c

Question 25 of 56

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

a.DNA naked

b.RNA enveloped

c.RNA non-enveloped

d.DNA enveloped

Question 26 of 56

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

a.In food

b.By insect vector

c.Through the air

d.Through body fluids

Question 27 of 56

28. Which of these are found in all viruses?

a.Protein, carbohydrate, lipids t

b.proteins and nucleic acid

c.DNA RNA, and proteins

d.envelope, nucleic acid, capsid

Question 28 of 56

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

a.Protein coat

b.DNA instead of RNA

c.RNA instead of DNA

d.DNA

Question 29 of 56

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

a.Mycoplasmas

b.Salmonella typhi

c.Pseudomonas

d.Escherichia coli

Question 30 of 56

31. Helicalerontractile sheath occurs in

a.Fungi

b.Bacteriophage

c.Bacteria

d.Retroviruses

Question 31 of 56

32. HIV attaches to

a.lipoprotein

b.CD4 protein

c.nucleoprotein

d.glycoproten

Question 32 of 56

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

a.Landing Tail contraction → Penetration → DNA injection

b.Landing Penetration Tail contraction → DNA injection

c.Penetration → Landing Tail contraction → DNA injection

d.Tail contraction → Landing → DNA Injection Penetration

Question 33 of 56

34. AIDS is due to.

a.Deficiency of riboflavin

b.Deficiency of T4 lymphocytes

c.Bacterial infection

d.High blood pressure

Question 34 of 56

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

a.Herpes simplex

b.Polio

c.Influenza

d.Small pox

Question 35 of 56

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

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

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

Question 36 of 56

37. Induction is a process in which a viral DNA

a.Enters into bacterial cell and attached with bacterial DNA

b.Detached from bacterial DNA

c.Destroy the bacterial DNA

d.Multiply with bacterial DNA

Question 37 of 56

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

a.crystal formation

b.reproduction

c.respiration

d.growth

Question 38 of 56

39. 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 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. Hepatitis D is caused by

a.viroids

b.bacteria

c.prions

d.virus

Question 41 of 56

42. Bacteriophage consists of or made up of.

a.DNA

b.Proteins

c.Nucleoproteins

d.Carbon and nitrogen

Question 42 of 56

43. Enveloped virus enters into host cells by.

a.Injecting own nucleic inside host cells

b.By phagocytosis

c.By contact with cell receptor and endocytosis

d.Fusion with the plasma membrane of host

Question 43 of 56

44. Poliomyelitis affects

a.motor neuron

b.sensory neuron

c.muscly

d.brain

Question 44 of 56

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

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

b.B cells are destroyed by HIV

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

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

Question 45 of 56

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

a.Conjugation

b.Translocation

c.Transformation

d.Transduction

Question 46 of 56

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

a.capsid

b.protein

c.ribosome

d.envelope

Question 47 of 56

48. ________ was formerly called as infectious hepatitis:

a.Hepatitis B

b.Hepatitis C

c.Hepatitis A

d.Hepatitis E

Question 48 of 56

49. Bacteriophage releases lysozyme during.

a.Penetration phase

b.Eclipse phase

c.Absorption phase

d.Maturation phase

Question 49 of 56

50. Animal viruses have.

a.RNA

b.DNA or RNA

c.DNA and RNA

d.DNA

Question 50 of 56

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

a.Endoparasites

b.Facultative Intracellular Parasites

c.Obligate Intracellular Parasites

d.Ectoparasites

Question 51 of 56

52. In a newly discovered virus you might fin

a.DNA or RNA

b.DNA and RNA

c.RNA

d.DNA

Question 52 of 56

53. 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.Transformation

b.Conjugation

c.None of these

d.Transduction

Question 53 of 56

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

a.AIDS

b.malaria

c.sleeping sickness

d.typhoid

Question 54 of 56

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

a.assemblage

b.production of lysosome

c.Disintegration of host DNA

d.DNA replication

Question 55 of 56

56. Prions are made up of

a.DNA and carbohydrate only

b.RNA and Lipids only

c.Protein and Nucleic acid only

d.none a, b and c

Question 56 of 56

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