Which of the following most accurately explains the cause for the abnormal numbers of chromosomes during human reproduction that can result in Down syndrome, Turner’s syndrome, or Klinefelter’s syndrome?

#Question id: 3045

#XL - S Microbiology

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

#Question id: 3046

#XL - S Microbiology

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

#Question id: 3047

#XL - S Microbiology

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? 

#Question id: 3048

#XL - S Microbiology

 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

#Question id: 3049

#XL - S Microbiology

E. coli cells typically make most of their ATP by metabolizing glucose. Under the conditions of this experiment, what should be true of E. coliʹs generation time

#Question id: 3050

#XL - S Microbiology

Agar is well suited as a solidifying agent because

A. it has been melted in boiling water

B. it can be cooled to about 40 to 42°C before hardening

C. it will not melt again until the temperature rises to about 80 to 90°C.

D. most microorganisms cannot degrade it.