TLS Online TPP Program

#Question id: 192


What is the role of the magnesium ion in kinases that require the magnesium-ATP complex to donate phosphoryl groups?

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. maintain the configuration of the holoenzyme

  2. shield the charged phosphate groups of ATP
  3. produce an electrophilic attack on the substrate

  4. promote ionization of bound water

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TLS Online TPP Program

#Question id: 3042

#Unit 2. Cellular Organization

Mycotoxins are formed during the end of

TLS Online TPP Program

#Question id: 3044

#Unit 2. Cellular Organization

If the pH indicator were left out of MacConkey agar, the medium would be

TLS Online TPP Program

#Question id: 3045

#Unit 2. Cellular Organization

Which one of the following combinations Mac-Conkey Agar allows to growth of gram negative bacteria?

(P) Bile salts                          (Q) Sodium chloride

(R) Methylene blue                  (S) Crystal violet

TLS Online TPP Program

#Question id: 3046

#Unit 2. Cellular Organization

Which one of the following reagent used in differentiation of gram positive and Gram negative bacteria?

(P) Congo red                        (Q) Safranine

(R) Methylene blue                  (S) Iodine

TLS Online TPP Program

#Question id: 3047

#Unit 2. Cellular Organization

A rapidly growing bacterial species such as E. coli exhibits a typical phase of growth cycle in liquid nutrient broth. If a bacterial culture has starting density 1000 cells/ml in log phase and after four hours cell density is 4000 cells/ml.  What is specific growth rate per hour? 

TLS Online TPP Program

#Question id: 3048

#Unit 2. Cellular Organization

 If a bacterium regenerates from an endospore that did not possess any of the plasmids that were contained in its original parent cell, the regenerated bacterium will probably