60. What is the shape of the lenses used in a microscope?
61. Antibiotics that kill are referred to as __________________________.
62. Name 2 ways in which antibiotics can kill bacteria.
63. What part of the penicillin molecule is responsible for its inhibitory activity?
64. Name 2 ways that cause or enable bacteria to become resistant?
65. Chemical substances that kill vegetative pathogens on inanimate surfaces
are called __________________________.
66. The process of reducing the microbial populations on surfaces, glassware
and utensils for food preparation in accordance with municipal health codes
is called __________________________.
67. Bacteria that require special or many growth factors are called ____________.
68. What technique do we use in lab to prevent contamination?
69. With what kind of cultures must we work, so we have reliable, valid tests?
Answer-60: Convex lenses are used in microscope. Their shape is such that they bulge outwards.
Answer-61: Those antibiotics which kill the bacteria are termed as bacteriocidal antibiotics.
Answer-62: Two ways in which antibiotics can kill the bacteria are:
● by inhibiting the synthesis of peptidoglycan which makes up their cell wall.
● by disrupting the ribosomal subunits and as a result no protein synthesis takes place.
Answer-63: It's because of four membered beta lactam ring that is responsible for showing the inhibitory effect.
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