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Explain the Characteristics of Agar- Agar?
There are many characteristics, which make agar-agar, an ideal solidifying agent. These are:
(a) It has high gel strength, so it can be used at a concentration that won't inhibit microbial growth due to low water activity.
(b) It solidifies at 40 o C and once solidified it can liquefy at 85-90 o C. So it is ideal for isolation of thermophiles.
(c) It does not have nutritional value. It is used as a nutrient source only by some marine bacteria, so that in normal use, it is not liquefied by bacterial growth. Solid media provides a hardened surface on which microorganisms can be grown in the form of discrete colonies to get pure cultures. Solid medium can be used in petri plates as agar plates.
This problem refers to the MN and ABO loci mentioned in class. It also refers to the Rh locus, which is responsible for the positive/negative part of the blood type. The Rh+ allele
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