Biology Chapter 10 Entry test MCQs
26. What is not true about hacterial spore?
a. Are desiccation resistant
b. Produced during differentiation of vegetative cells
c. May be exospores or endospores
d. Are heat resistant
27. Many bacteria are motile due to presence of:
a. Pilli
b. Flagella
c. Microtubules
d. Cilia
28. Nucleoid is a structure not found in:
a. Cyanobacteria
b. Campylobacter
c. Goblet cells
d. Spirochete
29. ————-is an invagination of cell membrane which helps in cell division.
a. Nucleoid
b. Fimbriae
c. Endospore
d. Mesosome
30. Students were asked to give a guess about a unicellular organism with darkly stained nucleus. Which of the following can be straight away excluded from the list?
a. Amocha
b. Paramecium
c. Lactobacillus
d. Plasmodium
31. DNA of bacteria is present in:
a. Nucleus
b. Nucleoid
c. Mesosome
d. Mitochondria
32. If one of the following components is missing, bacteria cannot increase the number of its plasmid copies?
a. Cloning site
b. Antibiotic resistant gene
c. Ligases Enzymes
d. Origin of replication
33. When tuft of the flagella is present at both the ends in the structure of bacterial cell, then the condition is called:
a. Lophotrichous
b. Atrichous
c. Amphitrichous
d. Peritrichous
34. Which of the following divide by fission?
a. Fungus
b. Viruses
c. Bacteria
d. Viroids
35. A bacterium which has a group of two or more flagella inserted at one pole of the cell:
a. Lophotrichous
b. Monotrichous
c. Amphitrichous
d. Peritrichous
36. The following are sexual reproduction methods in bacteria, except:
a. Binary fission
b. Transformation
c. Conjugation
d. Transduction
37. Which of the following is true about the structure of a typical bacterium?
a. It has cytoplasm
b. It has cell wall
c. It has genetic material
d. All of the above
38. It is not true about archaea:
a. Peptidoglycan is absent in cell wall
b. Inhibited by antibiotics
c. Branched carbon chains in membrane lipids
d. Introns are present in some genes
39. A similarity that can be present between flagella of bacteria and an animal cells
a. Length
b. Motility as function
c. Number
d. Type of protein
40. Chances of———having a flagella are rare.
a. Bacillus
b. Hyphomicrobium
c. Diplococcus
d. Escherichia
41. What is false statement about pili?
a. Crucial for conjugation
b. It is made up of pilin protein
c. Means of attachment
d. True pili present in gram positive and negative bacteria
Importance and Control of Bacteria
42. Bacteria that live in intestine and produce vitamin ‘K’ belongs to:
a. Bacillus
b. Coccus
c. Spirochetes
d. Spirilla
43. Resistance against antibiotics is mainly increasing because of:
a. Global warming
b. Misuse of antibiotics
c. Allergies
d. Greenhouse effect
44. Chemotherapeutic agent is/are:
a. Antibiotics
b. Disinfectants
c. Vaccines
d. Both A & B
45. Bacteria present in canned foods are:
a. Salmonella typhii
b. Clostridium botulinum
c. Streptococcus pneumoniae
d. Campylobacter jejuni
46. Antibiotics and hormones can be sterilized by using:
a. Dry heat
b. Membrane filtration
c. Moist heat
d. Radiations
47. What is true about antibiotics?
a. Always produced from living cells
b. Always protein in nature
c. Can also be synthesized in laboratory
d. Never cause side effects
48. Treatment by using attenuated culture of bacteria is called————.
a. Sterilization
b. Chemotherapy
c. Vaccination
d. Antisepsis
49. Which out of the following antibiotic causes permanent discoloration of teeth in young children if it is misused?
a. Streptomycin
b. Penicillin
c. Tetracycline
d. Sulfonamide
50. Antibiotics interfere with some aspect of growth or metabolism of the target organism such as:
a. Protein synthesis
b. Synthesis of bacterial walls
c. Enzyme action
d. Plasma membrane function e. All of these
51. Select the method which causes the oxidation of chemical constituents of a bacterial cell:
a. Dry heat
b. Steam
c. Radiation
d. Filtration
52. Which of the followings can have microbicidal effect?
a. Alcohol
b. Formaldehyde
c. Antibiotics
d. All A, B, C
53. ————-are in general used for sterilization process.
a. Beta rays
b. X-rays
c. Gamma rays
d. Ultrasounds
54. All of the followings can be sterilized by membrane filters except:
a. Hormones
b. Antibiotics
c. Flasks
d. Seras